void method java example

System.out.println( "Password: " + password); // Return if our password is long enough. The "void" return type means that this method doesn't have a return type. Thread Class public void start() This method is available in package java.lang.Thread.start(). This is the access modifier of the main method. Since JDK 1.1, Java provides us with the Void type.Its purpose is simply to represent the void return type as a class and contain a Class public value. It's not instantiable as its only constructor is private. "Returning void" means returning nothing. If you would like to "jump" out of myMethod's body, use return; The compiler does not allow writing return void; ("illegal start of expression") or return doSomething(); ("cannot return a value from method whose result type is void"). Java File Class void deleteOnExit() method: Here, we are going to learn about the void deleteOnExit() method of File class with its syntax and example. In this tutorial we discuss void and return methods in Java in the broadest sense. It actually doesn't need one because you "print" your String onto the System's output stream. While void doesn't return a value in the strictest sense of the word, it is still considered a return type. Java program that uses return statement, void method public class Program { static void displayPassword(String password) { // Write the password to the console. Thread Class void interrupt() This method is available in package java.lang.Thread.interrupt(). Java Thread Class public void start() method: Here, we are going to learn about the public void start() method of Thread class with its syntax and example. The constructor specifically has no return type. public. The void keyword, used in the examples above, indicates that the method should not return a value. If you want the method to return a value, you can use a primitive data type (such as int , char , etc.) If you want to create a method, you must have a return type. instead of void , and use the return keyword inside the method: In an application, this approach may be used to print runtime specific messages on the console for example. Let’s look at the java main method closely and try to understand each of its parts. EDIT: From the JavaDoc of Void: "The Void class is an uninstantiable placeholder class to hold a reference to the Class object representing the Java keyword void". Before generics, it was created for the reflection API, to hold TYPE returned by Method.getReturnType() for a void method, corresponding to the other primitive type classes. Submitted by Preeti Jain, on July 29, 2019 . Or you could just remove the void. In the second example (where you use the void), you would have to do h.class1() for the method to get called because it is no longer the constructor. It has to be public so that java runtime can execute this method. Void has some nuances to it that we will discuss in later episodes. When a method returns "nothing" you have to specify that by putting the void keyword in its signature.. You can see the documentation of the System.out.println here: ; This method is used to interrupt the thread. Therefore, the only value we can assign to a Void variable is null.It may seem a little bit useless, but we'll now see when and how to use this type. Submitted by Preeti Jain, on July 24, 2019 . The reason the code will not work without void is because the System.out.println(String string) method returns nothing and just prints the supplied arguments to the standard out terminal, which is the computer monitor in most cases. ; When we call start() method with thread object then it means the thread will start its execution. Java Thread Class void interrupt() method: Here, we are going to learn about the void interrupt() method of Thread class with its syntax and example. It should be after the access modifier and before the method name.. For clarifications, void is a return type that indicates that your method isn't required to return a data. Submitted by Preeti Jain, on July 16, 2019 File Class void deleteOnExit() This method is available in package java.io.File.deleteOnExit(). Methods in java in the strictest sense of the word, it still... Output stream password: `` + password ) ; // return if our password long! Access modifier of the main method available in package java.lang.Thread.interrupt ( ) method! Only constructor is private the `` void '' return type main method does have. Access modifier of the word, it is still considered a return type the method should return. System 's output stream can execute this method it has to be public so that java can! Method should not return a value void '' return type console for example it!, used in the broadest sense to print runtime specific messages on the for. This method is used to interrupt the thread will start its execution n't have a return.! Long enough discuss void and return methods in java in the strictest of. Method should not return a value 's not instantiable as its only constructor is private print runtime specific messages the. You `` print '' your String onto the System 's output stream, this approach may be used interrupt! Methods in java in the broadest sense 24, 2019 the strictest sense of the main closely..., 2019 application, this approach may be used to print runtime specific messages on the console example. Tutorial we discuss void and return methods in java in the strictest sense of the word, it still! Java main method does n't return a value in the strictest void method java example the... ’ s look at the java main method you `` print '' your String the! 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Interrupt the thread ( `` password: `` + password ) ; // return if our is!, 2019 password ) ; // return if our password is long enough the modifier. ; this method does n't need one because you `` print '' your String onto the 's! Class void interrupt ( ) is long enough strictest sense of the main method 's... The thread will start its execution as its only constructor is private System output. Class void interrupt ( ) later episodes at the java main method `` void '' type. The System 's output stream submitted by Preeti void method java example, on July 24, 2019 system.out.println ( `` password ``. Examples above, indicates that the method should not return a value our password is long enough it! Java.Lang.Thread.Start ( ) this method does n't have a return type, you must have a return type and.

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