public class SingletonExample3 { private SingletonExample3(){} private static SingletonExample3 instance = null; public static synchronized SingletonExample3 getInstance(){ if (instance == null){ instance = new SingletonExample3(); } return instance; } } 代码四:SingletonExample4 懒汉模式(双重锁同...
classSingletonExample{//引用对象的私有字段privatestaticSingletonExample singleObject;privateSingletonExample(){//SingletonExample类的构造函数}publicstaticSingletonExamplegetInstance(){//编写仅允许我们创建一个对象的代码//根据需要访问对象} } 在以上示例中, private static SingletonExample singleObject - 对类对象...
synchronized (Singleton5.class) {if(instance ==null) { instance =newSingleton5(); } } }returninstance; } } 为了安全,加上synchronized (Singleton5.class)同步监视器已经解决了,外面加上一层if判断是为了性能问题,如果有实例了就不等待锁了。 第六种:静态内部类 package org.example.singleton;/** * ...
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if(singleton==null) { synchronized(Singleton.class) { if(singleton==null) { singleton=newSingleton(); } } } returnsingleton; } } 感觉代码开始变得有点罗嗦和复杂了,不过,这可能是最不错的一个版本了,这个版本又叫“双重检查”Double-Check。下面是说明: ...
public class Singleton { private Singleton() {} private static class SingletonHolder { private static final Singleton INSTANCE = new Singleton(); } public static Singleton getInstance() { return SingletonHolder.INSTANCE; } } 详细代码解析 SingletonHolder是一个静态内部类,包含了Singleton的唯一实例; ...
packageSingleExample;// 饿汉式:创建对象实例的时候直接初始化;(空间换时间)public class SingletonOne { //1、创建类中私有的构造方法privateSingletonOne(){};//2、创建该类型的私有静态实例privatestaticSingletonOne instance=newSingletonOne();//3、创建公有的静态方法,返回静态实例对象publicstaticSingletonOneget...
package org.example.singleton; import java.io.IOException; import java.util.Properties; /** * 饿汉式:直接创建实例对象,不管是否需要这个对象都会创建实例。 */ public class Singleton3 { public static final Singleton3 INSTANCE; private String info; ...
class Bicycle { // state or field private int gear = 5; // behavior or method public void braking() { System.out.println("Working of Braking"); } } In the above example, we have created a class named Bicycle. It contains a field named gear and a method named braking(). Here, Bi...
classSingleton{privatevolatilestaticSingleton instance;publicstaticSingletongetInstance(){if(instance==null){syschronized(Singleton.class){if(instance==null){instance=newSingleton();}}}returninstance;}} 推荐懒加载优雅写法 Initialization on Demand Holder(IODH)。