-------------在面试中,可能会遇到让直接写一个单例模式,不会在意你会不会,理解不理解这东西,只要能写出来,面试就还能进行下去
//饿汉式
class Singleton {
private static Singleton instance = new Singleton();
private Singleton() {
}
static Singleton getInstance() {
return instance;
}
}
//懒汉式
class Singleton {
private static Singleton instance = null;
private Singleton() {
}
static Singleton getInstance() {
if (instance == null) {
instance = new Singleton();
}
return instance;
}
}
-------任意写出一个就够了