饿汉式和懒汉式的比较

Posted on 2019-08-04 18:35 wydrr 阅读(97) 评论(0) 收藏举报

//饿汉式
class Bank{

//1.私有化类的构造器
private Bank(){}

//2.在类的内部创建对象
private static Bank bank = new Bank();

//3.通过公共的方法，获取Bank实例
public static Bank getInstance(){
return bank;
}
}

//懒汉式
class Application{

//1.私有化类的构造器
private Application(){}

//2.声明当前类的对象，使用private static修饰
private static Application app = null;

//3.通过方法获取当前类的实例
public static Application getInstance(){

if(app == null){

app = new Application();

}
return app;

}

}