The constructor specifically has no return type. If you want to create a method, you must have a return type. 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. public. It has to be public so that java runtime can execute this method. instead of void , and use the return keyword inside the method: 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. Java program that uses return statement, void method public class Program { static void displayPassword(String password) { // Write the password to the console. 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. Let’s look at the java main method closely and try to understand each of its parts. Submitted by Preeti Jain, on July 29, 2019 . Submitted by Preeti Jain, on July 16, 2019 File Class void deleteOnExit() This method is available in package java.io.File.deleteOnExit(). If you want the method to return a value, you can use a primitive data type (such as int , char , etc.) 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. Or you could just remove the void. This is the access modifier of the main method. Void has some nuances to it that we will discuss in later episodes. 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. 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. 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: Thread Class public void start() This method is available in package java.lang.Thread.start(). While void doesn't return a value in the strictest sense of the word, it is still considered a return type. "Returning void" means returning nothing. 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. It actually doesn't need one because you "print" your String onto the System's output stream. 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". ; This method is used to interrupt the thread. The void keyword, used in the examples above, indicates that the method should not return a value. ; 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's not instantiable as its only constructor is private. The "void" return type means that this method doesn't have a return type. 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. 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