//单例模式---懒汉模式 public class Apple{ //创建一个成员,在内存中只有一个拷贝 private static Apple apple = null; private Apple(){ } //这个方法用来创建实例 public static Apple Instance(){ if(appel == null){ Apple apple = new Apple(); } return apple; } } //单例模式---饿汉模式 public class Apple2(){ private static Apple2 apple2 = new Apple(); private Apple2(){ } public static Apple2 getInstance(){ return apple2; } }