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: instead of void , and use the return keyword inside the method: ; This method is used to interrupt the thread. It's not instantiable as its only constructor is private. Thread Class void interrupt() This method is available in package java.lang.Thread.interrupt(). 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. Void has some nuances to it that we will discuss in later episodes. The constructor specifically has no return type. 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. 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". While void doesn't return a value in the strictest sense of the word, it is still considered a return type. 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. It has to be public so that java runtime can execute this method. Or you could just remove the void. Thread Class public void start() This method is available in package java.lang.Thread.start(). 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. ; When we call start() method with thread object then it means the thread will start its execution. 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 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. In this tutorial we discuss void and return methods in Java in the broadest sense. 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. This is the access modifier of the main method. "Returning void" means returning nothing. System.out.println( "Password: " + password); // Return if our password is long enough. 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"). In an application, this approach may be used to print runtime specific messages on the console for example. public. It actually doesn't need one because you "print" your String onto the System's output stream. If you want the method to return a value, you can use a primitive data type (such as int , char , etc.) The void keyword, used in the examples above, indicates that the method should not return a value. Java program that uses return statement, void method public class Program { static void displayPassword(String password) { // Write the password to the console. If you want to create a method, you must have a return type. 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