I am getting error while running Java program without main()

Question

I am getting error while running Java program without main(),but I used only static block to test whether the program will execute or not without main().Is there any other way to execute Java program without main().

Answer 1

Put System.exit(0) just before the end of the static block. You need this in order to terminated the program just before it will start searching for main method.

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Answer 2

Yes, you can use static initializer block , like this :-

public class Hello {
  static {
    System.out.println("Hello, World!");
  }
}

Outputs :-

Hello, World!

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

You can avoid the NoSuchmethodError by simply calling System.exit(0) immediately after printing the message like :-

static {
    System.out.println("Hello, World!");
    System.exit(0);
  }

Answer 3

Please mention which JDK you are using. If you are using JDK 7 then it will not allow you to run without main();

If you are using JDK 6 and Below you can do same without error as follows:

public class Hello {
  static {
    System.out.println("Hello, World!");
    System.exit(0);

  }
}