单例模式
louzhedong opened this issue · comments
Miracle commented
单例模式
保证一个类仅有一个实例,并提供一个访问它的全局访问点
优点:减少内存开销
确定:扩展难,测试不利
实现
JavaScript
var Singleton = function(name) {
this.name = name;
this.instance = null;
}
Singleton.prototype.getName = function() {
return this.name;
}
Singleton.getInstance = function(name) {
if (!this.instance) {
this.instance = new Singleton(name);
}
return this.instance;
}
// 使用
var a = Singleton.getInstance('abcd');
Java
public class Singleton {
private static final Singleton singleton = new Singleton();
// private保证类产生多个实例
private Singleton() {
}
public static Singleton getInstance() {
return singleton;
}
public static void doSomething() {
}
}