使用静态内部类增加类封装

public class Main {

    

    static String hello = "Hello";

    /** from NowJava.com - 时  代  Java**/

    

    public static void sayHello(){

        System.out.println(hello);

    }

    

    static class InnerExample {

        String goodBye = "Good Bye";

        

        public void sayGoodBye(){

            System.out.println(this.goodBye);

        }

    }

    

    public static void main (String[] args){

        Main.sayHello