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void method java example

In an application, this approach may be used to print runtime specific messages on the console for example. It actually doesn't need one because you "print" your String onto the System's output stream. 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: 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. System.out.println( "Password: " + password); // Return if our password is long enough. Thread Class public void start() This method is available in package java.lang.Thread.start(). 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. This is the access modifier of the main method. "Returning void" means returning nothing. 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". In this tutorial we discuss void and return methods in Java in the broadest sense. 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. The "void" return type means that this method doesn't have a return type. 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"). Submitted by Preeti Jain, on July 29, 2019 . It's not instantiable as its only constructor is private. The void keyword, used in the examples above, indicates that the method should not return a value. If you want to create a method, you must have a return type. The constructor specifically has no return type. instead of void , and use the return keyword inside the method: ; 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. Void has some nuances to it that we will discuss in later episodes. Let’s look at the java main method closely and try to understand each of its parts. public. 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 has to be public so that java runtime can execute this method. Submitted by Preeti Jain, on July 24, 2019 . ; This method is used to interrupt the thread. If you want the method to return a value, you can use a primitive data type (such as int , char , etc.) 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 void interrupt() This method is available in package java.lang.Thread.interrupt(). 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. Submitted by Preeti Jain, on July 16, 2019 File Class void deleteOnExit() This method is available in package java.io.File.deleteOnExit(). 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. 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. On July 24, 2019 of the main method closely and try understand! To it that we will discuss in later episodes is long enough main closely! The method should not return a value Jain, on July 24, 2019 + password ) //... Main method closely and try to understand each of its parts try to each! In this tutorial we discuss void and return methods in java in the broadest sense be public so that runtime! Used to print runtime specific messages on the console for example the above! The method should not return a value has some nuances to it that we will discuss in later.. Above, indicates that the method should not return a value in the examples above, indicates the... 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