void method java example

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Submitted by Preeti Jain, on July 24, 2019 . Thread Class void interrupt() This method is available in package java.lang.Thread.interrupt(). instead of void , and use the return keyword inside the method: 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. If you want to create a method, you must have a return type. ; 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. It's not instantiable as its only constructor is private. public. 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. Java program that uses return statement, void method public class Program { static void displayPassword(String password) { // Write the password to the console. 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"). ; When we call start() method with thread object then it means the thread will start its execution. If you want the method to return a value, you can use a primitive data type (such as int , char , etc.) 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. It actually doesn't need one because you "print" your String onto the System's output stream. In an application, this approach may be used to print runtime specific messages on the console for 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". "Returning void" means returning nothing. 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. In this tutorial we discuss void and return methods in Java in the broadest sense. 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. Thread Class public void start() This method is available in package java.lang.Thread.start(). This is the access modifier of the main method. 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" return type means that this method doesn't have a return type. 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. System.out.println( "Password: " + password); // Return if our password is long enough. Submitted by Preeti Jain, on July 29, 2019 . The constructor specifically has no return type. Or you could just remove the 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. 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(). 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.

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