单例模式之静态内部类与枚举类
package singleton.type6;
public class SingletonTest6 {
public static void main(String[] args) {
System.out.println("静态内部类，推荐使用");
Singleton singleton = Singleton.getInstance();
Singleton singleton1 = Singleton.getInstance();
System.out.println(singleton == singleton1);
System.out.println(singleton.hashCode());
System.out.println(singleton1.hashCode());
}
}
//静态内部类完成单例模式
class Singleton{
//1.私有化构造器
private Singleton(){}
//2.定义静态内部类
private static class SinglentonHolder{
private static final Singleton INSTANCE = new Singleton();
}
//3.定义静态公共方法
public static Singleton getInstance(){
return SinglentonHolder.INSTANCE;
}
}