If you want to create a method, you must have a return type. ; When we call start() method with thread object then it means the thread will start its execution. 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"). Thread Class void interrupt() This method is available in package java.lang.Thread.interrupt(). The "void" return type means that this method doesn't have a return type. Submitted by Preeti Jain, on July 24, 2019 . This is the access modifier of the main method. Submitted by Preeti Jain, on July 29, 2019 . instead of void , and use the return keyword inside the method: 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. Let’s look at the java main method closely and try to understand each of its parts. 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. 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. Thread Class public void start() This method is available in package java.lang.Thread.start(). public. System.out.println( "Password: " + password); // Return if our password is long enough. 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. 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. ; This method is used to interrupt the thread. Java program that uses return statement, void method public class Program { static void displayPassword(String password) { // Write the password to the console. In an application, this approach may be used to print runtime specific messages on the console for example. Or you could just remove the void. Submitted by Preeti Jain, on July 16, 2019 File Class void deleteOnExit() This method is available in package java.io.File.deleteOnExit(). 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. 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. 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". If you want the method to return a value, you can use a primitive data type (such as int , char , etc.) In this tutorial we discuss void and return methods in Java in the broadest sense. It's not instantiable as its only constructor is private. 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: The void keyword, used in the examples above, indicates that the method should not return a value. 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. "Returning void" means returning nothing. It actually doesn't need one because you "print" your String onto the System's output stream. 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