单例模式

最新推荐文章于 2025-05-23 19:33:43 发布

原创最新推荐文章于 2025-05-23 19:33:43 发布 · 175 阅读

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1.饿汉式 : 类加载的时候就创建了

public class HungeryInstance{
    
    private HungeryInstance(){}
    //类加载的时候就创建
    private static HungeryInstance hgInstance = new HungeryInstance();

    public static Hungery getSingleTonInstance(){
        return hgInstance;
    }
}

2.懒汉式:调用的时候再创建

public class LazyInstance{
    
    private LazyInstance(){}
    
    private static LazyInstance lazyInstance =null;
    
    //为了线程安全,需要加synchronized 关键字确保只会生成单例
    public static synchronized getInstance(){
        if(lazyInstance==null){
            lazyInstance = new LazyInstance();
        }
        return lazyInstance;
    }
}