(88)单例模式的应用

单例类：

public class Emperor {    private static Emperor emperor = null;        private Emperor() {            }        public static Emperor getInstance() {        if (emperor == null) {            emperor = new Emperor();        }        return emperor;    }        public void getName() {        System.out.println("我是皇帝：明日科技");    }    }

单例测试类：

public class EmperorTest {    public static void main(String[] args) {        System.out.println("创建皇帝1对象：");        Emperor emperor1 = Emperor.getInstance();        emperor1.getName();        System.out.println("创建皇帝2对象：");        Emperor emperor2 = Emperor.getInstance();        emperor2.getName();        System.out.println("创建皇帝3对象：");        Emperor emperor3 = Emperor.getInstance();        emperor3.getName();    }}