单例模式饿汉式

1.User类;

public class User { //给定一个对象最终的; public static final User user=new User(); private String name; public String getName() { return name; } public void setName(String name) { this.name = name; } public static User getUser() { return user; }

}

2.TestUser类；

public class TestUser { public static void main(String[] args) { User u1=User.getUser(); User u2=User.getUser(); u1.setName("tom"); u2.setName("link"); System.out.println(u1.getName()); System.out.println(u2.getName()); } }

3.程序运行如下:

link link