3个ava Appnca⊙ /Display a message * class HelloWorld public static void main(String[]args){ System.out.println ("Hello World!"); HelloWorld.java A3-11 Programming in Java 第一个 Java Application(1) /* Display a message */ class HelloWorld { public static void main(String[] args){ System.out.println("Hello World!"); } } /* Display a message */ class HelloWorld { public static void main(String[] args){ System.out.println("Hello World!"); } } HelloWorld.java