【JAVA学习之路 | 基础篇】单例设计模式

public class Singleeton {
 
}
class HungryMan {
    //1.类的构造器的私有化
    private HungryMan() {
 
    }
    //2.在类的内部创造当前类的实例
    //4.且该hungryman属性也声明为static的
    private static HungryMan hungryman = new HungryMan();
    //3.通过geyInstance2的方法获取当前类的实例，必须声明为static
 
    public static HungryMan getInstance1() {
        return hungryman;
        //return HungryMan.hungryman;
    }
}
 
class LazyMan {
    //1.类的构造器的私有化
    private LazyMan() {
 
    }
    //2、。在类的内部创造当前类的实例
    //4.且该hungryman属性也声明为static的
    private static LazyMan lazyman = null;
    //3.通过geyInstance2的方法获取当前类的实例，如果未创建对象，则在方法内部创建对象
 
    public static LazyMan getInstance2() {
        if (lazyman == null) {
            lazyman = new LazyMan();
        }
        return lazyman;
        //return LazyMan.lazyman;
    }
}