package myproject1;

public class HelloWorld {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		System.out.print("Hello World!");
	}

}

package myproject1;

public class HelloWorld {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		System.out.print("Hello World! 日本語追加");
	}

}

Change print text with Japanese.
Change print text with Japanese.