此代码没有任何反应。 为什么？

Question

public void main(String[] args) {
    System.out.println("Hello World!");
}

This compiles in my environment, but nothing happens at run time.

Answer 1

If should be a static method, otherwise it can't serve as the entry point of a Java application.

public static void main(String[] args) 
       ------
{
    System.out.println("Hello World!"); 
}

Answer 2

主要方法应为： public static void main(String[] args)

Answer 3

public void main(String[] args)

更改为

public static void main(String[] args)  

Answer 4

main() method syntax is,

public static void main(String[] args) 

you are missing static , so JVM not able to find your main() method ie entry point so there is noting happened.

Check your console It should display error message as

java.lang.NoSuchMethodError: main
Exception in thread "main"