Example 1 Level 1 = 1 Level 2 = 2,3 Level 3 = 4,5,6 In All, the level . Can a main method in Java return something? So in order to invoke sample (), you need to invoke it from main (), then have your shell script run "java test". However, we can use this approach only if all the values to be returned are of the same type. ); If you need to find if a value exists in an array, use includes().Again, it checks each element for equality with the value instead of using a . Other methods must return the correct type. You will want to use something like int minutes = getMinutes(); how do you pass the result from the main to calcMeth as a parameter? So far, we've used various commands: value assignment, calculations, conditional statements, and loops. Let's see some of the most critical points to keep in mind about returning a value from a method. Does a 120cc engine burn 120cc of fuel a minute? How to return value from a for loop in Java - Quora Answer (1 of 5): That's a good question if you're looking for a way to return values while doing an iteration so that it can reduce your time complexity. Name of poem: dangers of nuclear war/energy, referencing music of philharmonic orchestra/trio/cricket. When we are writing the following code Cube obj2 = obj1.getObject (); in the above example, the called method getObject () of obj1 object is returning the reference of the newly created object. However, in this section, we'll limit our discussion to the List and Map interfaces. This article will help you on how to return a value in java language using the return keyword. To learn more, see our tips on writing great answers. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. The space complexity of the program is constant, i.e., O(1). In the main method, we implement logic to compare and classify the array weight double values as "Underweight" or . that your java main method could return something. Fashion Studies. When to use LinkedList over ArrayList in Java? You can create parameterized and non-parameterized methods, and you can create methods that return a value. How do I read / convert an InputStream into a String in Java? Follow the Return keyword with an expression that yields the value you want to return to the calling code. Developer's Best Practices. More info about Internet Explorer and Microsoft Edge, How to: Create a Procedure that Returns a Value, How to: Call a Procedure That Returns a Value. How To Return Values In Object Return Type Function (method) Apr 2, 2014. Therefore, we will return 'a' as a value of int type. Within the body of the method, you use the return statement to return the value. When you execute an Exit Function or End Function statement, Visual Basic returns the value most recently assigned to the procedure's name. with the "java" command). QGIS Atlas print composer - Several raster in the same layout, Books that explain fundamental chess concepts. The String class is immutable. The main () is the starting point for JVM to start execution of a Java program. In the main method, the return value from the return_array method is assigned to the string array and then displayed. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Initially, the value of n is 4 inside factorial (). Why doesn't Stockfish announce when it solved a position as a book draw similar to how it announces a forced mate? What is the difference between public, protected, package-private and private in Java? If you need the index of the found element in the array, use findIndex(). For this purpose, Java provides a special data type, i.e., boolean, which can take the values true or false. Types must match, or an error occurs. The data type that should be returned should be the same that was defined when creating the method or is a covariant type. He asked write a program so In programming, we generally need to implement values that can only have one of two values, either true or false. If you want your method to return a boolean value, its declaration should contain a boolean keyword before the name of the method. The steps of the example are described in short: We have implemented two classes, RetDouble and RetInt that both implement the Callable, the first using as parameter a Double and the second one using as parameter an Integer. in here i can pass the values using return keyword of the method and also i can create a public getter method for ArrayList and make my method void. When we return the answer, it will go again to the method where it was called, ret.addNum(10, 20), and save the returning value to the variable ans. Consider the following example. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. The syntax of the main () method is: public: It is an access specifier. Some examples are, But, note here that the compiler will only know. It does not need to contain a return statement, but it may do so. Case 2: If we have to return two values of different types. In order to return an array in java we need to take care of the following points: Keypoint 1: Method returning the array must have the return type as an array of the same data type as that of the array being returned. You are looking for Stream.flatMap().. Returns a stream consisting of the results of replacing each element of this stream with the contents of a mapped stream produced by applying the provided mapping function to each element It will take a long primitive value as an argument and create an instance of the Long class representing that value. Returning Values of Similar Type in a List thrift. And it is obviously nonsense that the compilation fails if there is no. Psychology. This is the same as iterating with a for.in loop, except that a for.in loop enumerates properties in the prototype chain as well. The code in the example ensures that your program runs until the . Write a program so that your Java main method could return something. Finding the original ODE using a solution, Radial velocity of host stars and exoplanets. Does integrating PDOS give total charge of a system? This class can be a POJO with public member variables and a public constructor to initiate its fields with required values or a JavaBean with . and then use that value on calcMeth(), to get the calculation. A different return type doesn't mean overloading and what Anurag shows here isn't overloading, just different ways to expressing the same parameter type. Questions and Answers. The following example shows a typical call to hypotenuse, which stores the returned value. What are the differences between a HashMap and a Hashtable in Java? This means that the method will not execute any more statements beyond the return keyword, and any local variables created in the method will be discarded. All other logos, trademarks and copyrights are property of their respective owners and are only mentioned for informative purposes. When used with a stored procedure, RETURN cannot return a null value. Making statements based on opinion; back them up with references or personal experience. Figure 8.4 illustrates the use of a return statement. You can have only one End Function statement in a Function procedure. View the full answer. I went through an interview recently and they ask me two questions in core Java. In at least one place in the Function procedure, assign a value to the procedure's name. Why do we use perturbative series if they don't converge? In the code above, the result of this return value is saved in the variable newString. The argument serves as a status code; by convention, a nonzero status code indicates abnormal termination. They both override the call () method of the Callable, and the . value = null;} /** Returns true if field value is set (has been assigned a value) and false otherwise */ public boolean isSetValue {return this. All Rights Reserved. Occasionally you may have an exception in the main thread java.lang.nullpointerexception. But, at the time of execution JVM does not consider this new method (with return type other than void) as . Can we write a java class with : public static int main(String[] args){. which one should i choose ? value!= null;} public void . Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. In order to return multiple values in Java, we can use an array to stores multiple values of the same type. When n is equal to 0, the if statement returns false hence 1 is returned. The resolution to the problem that comes with multi-value returns can be solved by either creating a user-defined class to store the output or using built-in datatypes as Array, Pair (if only two values are there to . Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. 2011-2022 Sanfoundry. The second way is by using the String class. Zorn's lemma: old friend or historical relic? Can virent/viret mean "green" in an adjectival sense? For example: ? Does aliquot matter for final concentration? This has been mentioned by many others and is intended to be used to declare the success (return code == 0) or failure (return code > 0) of your application. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Why does the USA not have a constitutional court? The first one is a Counter and the second one is an int representing the number of guests visiting via the gate. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Connect and share knowledge within a single location that is structured and easy to search. The first method declares the return value as boolean and the acceptable parameter as int. value;} public SensorValues setValue (@ org. Next, we can now proceed to the new chapter which is creating a Java SE application that includes creating a graphical user interface (GUI) and first in our topic, is how to create a JFrame. Sanfoundry Global Education & Learning Series 1000 Java Programs. How do I determine whether an array contains a particular value in Java? i want to know how to pass the value of getMinutes() to calcMeth() without twice running the getMinutes(), You call getMinutes in the main method AND the calcMeth, I think you're suppose to only call it from the main method and pass the result to calcMeth as a parameter. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. For example: In our example above, we have created a class named Return. However, we do not have to enclose a void method invocation in braces. It first created an instance of our Return class. Is it possible to hide or delete the new Toolbar in 13.1? Finding the original ODE using a solution. Effective Resume Writing. how can you make public static void main([] args) to return something? This will always call the main () method (which may do anything you like). Taking and returning string data using char [] is not a better option. Typically, in languages where main returns int (such as C and C++) the return code of main becomes the exit code of the process, which is often used by command interpreters and other external programs to determine whether the process completed successfully. this method will execute all codes inside it before you got its return value. For methods that don't return a value, the return statement can be used without a return value to exit a method. Remarks. So, obj2 is getting the reference of the newly created object. Inside our addNum method was the adding of the variable a and b and save the answer to the variable answer and eventually return whatever the variable answer hold. Object.values () returns an array whose elements are strings corresponding to the enumerable string-keyed property values found directly upon object. Can i catch this return value and show it at console? Giving us an output of 30. Is this an at-all realistic configuration for a DHC-2 Beaver? Is it cheating if the proctor gives a student the answer key by mistake and the student doesn't report it? Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? It is used to exit from a method, with or without a value. You can have more than one Return statement in the same procedure. (It's similar to findIndex(), but checks each element for equality with the value instead of using a testing function. What is wrong in this inner product proof? @secretformula: Your answer is written in the style of a teacher giving some information, in the hope that a student will follow up and learn more. Try the following to exit with an int status in Java System.exit(45). Ready to optimize your JavaScript with Rust? Making statements based on opinion; back them up with references or personal experience. This method's return statement is of boolean type based on whether the parameter is above or below 72. Not the answer you're looking for? Does illicit payments qualify as transaction costs? Complexity Analysis: Since the program is using a for-loop for computing the sum of elements, the time complexity of the program is O(n), where n is the total number of elements present in the array. The thing returned to you is called the method's return value, and the type of thing returned to you is called the method's return type. Here is the source code of the Java Program to Return a Value from a Method. Just cancel first call for getMinutes () method in your main , each time you call or try to get return value of a method . These methods are consumers and are often used as the last callback in the callback chain. Your answer doesn't explain what this does and why it might be comparable to returning an int from main. Here is the source code of the Java Program to Return a Value from a Method. This is the simplest approach to return both primitive type data as well as reference data types. Returning a Value from a Method In Java, every method is declared with a return type such as int, float, double, string, etc. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Let's get started. To return a boolean value from a method, we need to mention boolean in the method signature. Why do quantum objects slow down when volume increases? Need to Return Values From a Thread My work as a freelance was used in a scientific paper, should I be included as an author? How does legislative oversight work in Switzerland when there is technically no "opposition" in parliament? Thanks for contributing an answer to Stack Overflow! public class Main { public static void main ( String [] args ) { String s = doSomething (); System . With generic Java collections, we can return multiple values of a common type. In Java, return is a reserved keyword i.e, we can't use it as an identifier. This lecture contains the concept about how to create the main menu in python and how a function returns a value from where that is calledCambridge IGCSE Pla. This is an example of how to return the value of a Thread. Put a Return statement at the point where the procedure's task is completed. public static boolean isOdd(int num); The meaning of each term: The public keyword is an access modifier that declares that the member is visible to all other classes and can be accessed anywhere in the code. The target object. is there any benefits for one of them at all ? Yes, you can but you can't run that Java class. The below code shows how to return an array of double data types in Java. The 'return_array' method is declared an array of strings 'ret_Array' and then simply returns it. Ready to optimize your JavaScript with Rust? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. How do I generate random integers within a specific range in Java? Return an Array of specific type or object. Asking for help, clarification, or responding to other answers. These return types required a return statement at the end of the method. When to use LinkedList over ArrayList in Java? The return type of a method in which lambda expression used in a return statement must be a functional interface. One can not return a value from a Java main function. You can have more than one Return statement in the same procedure. The static is a keyword mainly used for . By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. We also make a method named add which is used to perform addition and return the result back to input method where we finally print the result. Does Java support default parameter values? importjava.text.NumberFormat; We should use a public keyword before the main () method so that JVM can identify the execution point of the program. in Java. Parameters. Programs can however return a status code. The following Function procedure calculates the longest side, or hypotenuse, of a right triangle, and returns it to the calling code. int m1 (int a) { // Here, parameter 'a' is a local variable. HashMap - getting First Key value in Java: 2: Java stream - Sort a List to a HashMap of Lists: 3: Hashmap with Streams in Java 8 Streams to collect value of Map: 4: Key existence check in HashMap in Java: 5: How to print a java map Map<String, Object>? @DeepakSharma Not from the same program. Implement the run method to call the addOne method as many times as the specified number of guests. Can several CRTs be wired in parallel to one oscilloscope circuit? In Java methods have "return" statements. The data type that should be returned should be the same that was defined when creating the method or is a covariant type. Previous question Next question. Mathematica cannot find square roots of some matrices? Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. The idea is to return an instance of a class containing all fields we want to return. CGAC2022 Day 10: Help Santa sort presents! I answered: No. Other names may be trademarks of their respective owners. Is Java "pass-by-reference" or "pass-by-value"? rev2022.12.11.43106. it throws me error incompatible types: unexpected return value -- return 10; please correct it make note where i am doing wrong code? Follow the Return keyword with an expression that yields the value you want to return to the calling code. the string to replace it with ('warm'). Case 1: Assume int a = 200; // instance variable. Find centralized, trusted content and collaborate around the technologies you use most. How can I use a VPN to access a Russian website that is banned in the EU? 3.1. The answer would be 1) return second value using a parameter by reference; 2) using pointer passed by value and changing the pointed object in the code of your function (as it is done on C); 3) using return parameter, but with a different type such as class or struct, so all your return data would be passed in the members of the class / struct . How do I convert a String to an int in Java? Social Studies. Returning a value means storing the evaluated variable and return its data to the method where it was called. Is Java "pass-by-reference" or "pass-by-value"? return n * factorial (n-1); The factorial () method is calling itself. If he had met some scary fish, he would immediately return to the surface. Prev. How do I read / convert an InputStream into a String in Java? Whenever you execute a program in Java, the JVM searches for the main method and starts executing from it. I'll demonstrate this to you via an example. Would like to stay longer than 90 days. Usage of return keyword as there exist two ways as listed below as follows: Case 1: Methods returning a value Case 2: Methods not returning a value Let us illustrate by directly implementing them as follows: Q 1. In this example, we return the result of cube () when getVolume () returns. The return type may be the usual Integer, Double, Character, String, or user-defined class objects as well. This code shows a method that returns a value. How do I efficiently iterate over each entry in a Java Map? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. In the United States, must state courts follow rulings by federal courts of appeals? Connect and share knowledge within a single location that is structured and easy to search. this method will execute all codes inside it before you got its return value. println ( "Print the value from the function . This is a Java Program to Return a Value from a Method. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Nullable String value) {this. Finally, create a class Zoo with a main method. Serialise code of binary tree for each level, we write the node value from left to right. Returning anything from a method with a void return type leads to a compile error. How do I generate random integers within a specific range in Java? In our example above, we have created a class named Return. In a return statement, we can invoke another method. Yes You can return of type void.But the value will go to JVM and no more code after return will be executed because The control will return to JVM which calls main(). Any method declared void doesn't return a value. And you would need to change your calcMeth to allow for a value to be past to it, for example See Passing Information to a Method or a Constructor for more details. how to use public static int main (String args []) ? For example, the code snippet given below defines a boolean method named isEven (). Async Main return values. To achieve the same effect in Java, use the System.exit method (analogous to the standard C function exit), like so: Quoting the Java documentation linked above: Terminates the currently running Java Virtual Machine. This is the last article for our Java Basic Tutorial. The compiler won't compile it as it is expecting the return type of main to be int, though we can overload it. A return keyword is used for returning the resulted value. I.e. Exception in thread "main" java.lang.NumberFormatException: For input string: "twenty" at java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:68) at java.base/java.lang . We must enclose statements in braces ( {}). Is it cheating if the proctor gives a student the answer key by mistake and the student doesn't report it? In a void method, an implicit (hidden) return is always at the end of the method. The following program provides another example of returning an array from a method. Q 2: The next question I was unable to answer. Find centralized, trusted content and collaborate around the technologies you use most. What does it return? How to make voltage plus/minus signs bolder? Below is the code block to explain the function of returning a string. Returning a value means storing the evaluated variable and return its data to the method where it was called. A return statement is used to exit from a method, with or without a value. The timestamp returned is based on the start time of the current transaction. The collections framework has a wide spectrum of classes and interfaces. This is the most commonly used method to return multiple values from a method in Java. return this. Does illicit payments qualify as transaction costs? out . If a procedure tries to return a null value (for example, using RETURN @status when @status is NULL), a warning message is generated and a value of 0 is returned.. We can return an array of any data type from a method. UPSC IAS Exams Notes. Concentration bounds for martingales with adaptive Gaussian steps, Exchange operator with position and momentum. Here is an example of value retuning method that takes one parameters num and returns the factorial of num. 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Heres the list of Best Books in Java Programming, Data Structures and Algorithms. Without the main () method, JVM will not execute the program. We make a method named input which is used to get input from the user. If you want the method to return a value, you can use a primitive data type (such as int or double) instead of void, and use the return keyword inside the method: Example static int MyMethod(int x) { return 5 + x; } static void Main(string[] args) { Console.WriteLine(MyMethod(3)); } // Outputs 8 (5 + 3) Try it Yourself In the examples below, we use the equal to ( ==) operator to evaluate an expression: Example int x = 10; System.out.println(x == 10); // returns true, because the value of x is equal to 10 Try it Yourself Example System.out.println(10 == 15); // returns false, because 10 is not equal to 15 Try it Yourself Real Life Example You declare a method's return type in its method declaration. In case we have the two values of the different types, we can use Pair. The return keyword is used to return from a method when its execution is complete. rev2022.12.11.43106. What are the differences between a HashMap and a Hashtable in Java? To let a method return a value, use the return statement. For methods that define a return type, the return statement must be immediately followed by a return value. You could write a wrapper script in your shell language of choice, however calling. Dual EU/US Citizen entered EU on US Passport. I'm new in java and i'm still trying to understand how to return a value and then retrieve it. We make a method named input which is used to get input from the user. Threading Return Values in Python March 4, 2022 by Jason Brownlee in Threading You can return values from a thread via instance variables on the threading.Thread class or via global variables. You will receive an error message when trying to run it: Q 2: Next question I unable to answer. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. boolean method 1 2 3 public boolean isEven (int num) You should note the following points in the above declaration. In a return statement, we evaluate expressionsand as part of this evaluation, other methods may run. If you don't specify the async keyword, you need to write that code yourself, as shown in the following example. When you declare an async return value for Main, the compiler generates the boilerplate code for calling asynchronous methods in Main. You can write the main method in your program with return type other than void, the program gets compiled without compilation errors. The program output is also shown below. Is there a higher analog of "category with all same side inverses is a groupoid"? This will result in 10 + 20 which is equal to 30 that will be held by our variable answer. Passing Information to a Method or a Constructor. The shell cannot interpret Java by itself, you must first start a JVM executing your code (i.e. A return statement is not an expression in a lambda expression. // here i want the values // option 1 : // ArrayList<Transaction> transactions = XMLParser.initTransactions (doc . This process continues until n is equal to 0. For more information and an example, see "Return Value" in Function Statement. A method with a return value: public class Main { static int myMethod(int x) { return 5 + x; } public static void main(String[] args) { System.out.println(myMethod(3)); } } // Outputs 8 (5 + 3) Try it Yourself Definition and Usage The return keyword finished the execution of a method, and can be used to return a value from a method. If such method is not found the program gets executed successfully, but when you execute the program it generates an error. To achieve the same effect in Java, use the System.exit method (analogous to the standard C function exit ), like so: public static void main (String [] args) { System.exit (42); } Quoting the Java documentation linked above: Terminates the currently running Java Virtual Machine. This can be caused by various factors, such as not checking for null values in a method's body, not checking for null values in the method's argument list, and failing to handle the return value of a method appropriately. Yes, we can write main method with a return type other than void. A method can return a value or reference type or does not return a value. Just cancel first call for getMinutes() method in your main , each time you call or try to get return value of a method . This is a Java Program to Return a Value from a Method. Should I exit and re-enter EU with my EU passport or is it ok? To learn more, see our tips on writing great answers. It doesn't affect how the values are stored; it affects how they are interpreted. A "void" method does not need to have a return, but it can include one to exit early. When we are writing a method, most of the time we want to return something from the calling method. apache. One way of doing such thing is by modifying the values of args[i] for i smaller than args.length, at the interior of method main. In this tutorial you will discover how to return values from a thread. We have four ways to take and return string data as:- 1) char [] / byte [] 2) String 3) StringBuilder 4) StringBuffer The char [ ] is not a better option because it works on an array. A Function procedure returns a value to the calling code either by executing a Return statement or by encountering an Exit Function or End Function statement. You can have more than one Exit Function statement in the same procedure, and you can mix Return and Exit Function statements in the same procedure. How to get an enum value from a string value in Java. PSE Advent Calendar 2022 (Day 11): The other side of Christmas. If a method does not return a value, the method must be declared void and it doesn't need . the substring to find ('cold'). The void return type doesn't require any return statement. The boolean values can be declared with the boolean keyword. Boolean values in Java. When i create an object in main method and pass values to my function of return type TwoDPoint,it gives error:- found int,int need TwoDPoiint,TwoDPoint. In the second line of the main method, we have called our method addNum(). Selected Reading. Postgresql - Selecting records between two timestamps. To return a value using the Return statement Put a Return statement at the point where the procedure's task is completed. on this task, the instructions were to use getMinutes(), to return a value to the main method. How do i take input values for TwoDPoint (which are objects) and return it back in numerical values also print them. Economics. A Java example To see how return values and a return types work in a real Java program, check out the code below. Asking for help, clarification, or responding to other answers. How do I arrange multiple quotations (each with multiple lines) vertically (with a line through the center) so that they're side-by-side? PSE Advent Calendar 2022 (Day 11): The other side of Christmas. 1. The Java program is successfully compiled and run on a Windows system. Return, void method. The use of one pair of brackets ( [ ]) indicates that the method is returning one-dimensional array of type data-type. Not the answer you're looking for? The method will return the value immediately when the keyword is encountered. 6: Find and replace words/lines in a file in Java: 7: Java HashMap: How to get a key and . When storing a date value, PostgreSQL uses the yyyy-mm-dd format e. More Examples Using a POJO class instance. During the next recursive call, 3 is passed to the factorial () method. Return Multiple Values Using the ArrayList Class in Java ; Return Two Values Using the Pair Class in Java ; In Java, there is no privilege to return two values to a function. The following parameters are passed to has () method. If the int value passed is below 72, the method returns false, and if the value passed is above 72, the method returns true. Is this an at-all realistic configuration for a DHC-2 Beaver? You can use System#exit(int) to quit your program with a specific exit code which can be interpreted by the operating system. Method is returning the reference of the object. Thanks for contributing an answer to Stack Overflow! confusion between a half wave and a centre tapped full wave rectifier. We also make a method named add which is used to perform addition and return the result back to input method where we finally print the result. ; If you need to find the index of a value, use indexOf(). If you look at the replace () function MDN reference page, you'll see . Return types in Java In Java, the method return type is the value returned before a method completes its execution and exits. In the main method you should create one Counter and several Gates. The getWeight() method returns an array of double values. . - - - - - return a; } The above code contains both instance and local variables. You know how to create methods and how to call them from both the main program (the main method) as well as from inside other methods. In fact, depending on your operating systems shell, there may be pre-defined meanings for the different return codes and generally they are all positive numbers between 0 and 254. this is bound to the handler. In Java, the prototype of a method must contain a return type always based on the data type specified in the declaration. If above method is not present it will not compile. The general syntax of a method that can return a one dimensional array is as follows: data-type [ ] [ ] method-name (argument) { // statements; // return arrayname; } Here, data-type represents the type of array being returned. What will public static int[] main (int[] ) return and where? Return an array of double values. When the function completes (finishes running), it returns a value, which is a new string with the replacement made. 2. thenAccept () and thenRun () If you don't want to return anything from your callback function and just want to run some piece of code after the completion of the Future, then you can use thenAccept () and thenRun () methods. The public static void main (String args []) is the entry point of a Java program Whenever you execute a program the JVM searches for the main method and starts executing the contents of it. The code works, but when I run it, the getMinutes(), gets run twice. On StackOverflow, the intent is to give complete answers which not only aid the original asker, but, Who upvotes this nonsense? The name or Symbol of the property to check for existence. annotation. In Java, the return keyword returns a value from a method. reaches a return statement, or throws an exception (covered later), whichever occurs first. And: The cube method itself returns the result of Math.pow, a built-in mathematics method. Generally, there are three cases for returning a variable in Java. value = value; return this;} public void unsetValue {this. This simply means that we can overload our main method. When a return statement is reached in a method, the program returns to the code that invoked it. 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