关于javascript:手摸手带你用Hexo撸博客二之配置主题

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// 测试 Singleton instance = Singleton.getInstance();
Singleton instance1 = Singleton.getInstance();System.out.println(instance == instance1);//true
System.out.println(“instance.hashCode=” + instance.hashCode());//1163157884System.out.println(“instance1.hashCode=” + instance1.hashCode());//1163157884
}}
// 饿汉式 (动态变量)
class Singleton {//1. 私有化结构器，内部不能能 new
private Singleton() {}//2. 在本类外部创建对象实例
private final static Singleton instance = new Singleton();//3. 提供一个共有的静态方法，返回实例对象
public static Singleton getInstance() {return instance;
}}
优缺点阐明长处；这种写法比较简单，就是再类装载的时候就实现实例化。防止了线程同步问题。
毛病；再类装载的时候就实现实例化，没有达到 Lazy Loading(懒加载)的成果。如果从始至终从未应用这个实例，则会造成内存的节约。这种办法基于 classloder 机制防止了多线程的同步问题，不过，instance 再类装载时就实例化，再单例模式种大多数都是调用 getInstance 办法，然而导致类装载的起因有很多种，因而不能确定其余的形式 (或者其余的静态方法) 导致类装载，这时候初始化 instance 就没有达到 lazy loading 的成果
论断；这种单例模式可用，可能造成内存节约。饿汉式 (动态代码块)
代码
public class SingletonTest2 {
public static void main(String[] args) {// 测试
Singleton instance = Singleton.getInstance();Singleton instance1 = Singleton.getInstance();
System.out.println(instance == instance1);//trueSystem.out.println(“instance.hashCode=” + instance.hashCode());//1163157884
System.out.println(“instance1.hashCode=” + instance1.hashCode());//1163157884}
}
// 饿汉式(动态变量)class Singleton {
//1. 私有化结构器，内部不能能 newprivate Singleton() {}
//2. 在本类外部创建对象实例 private static Singleton instance;
// 在动态代码块中，创建对象 static {instance = new Singleton(); }
//3. 提供一个共有的静态方法，返回实例对象 public static Singleton getInstance() {
return instance;}
} 优缺点阐明
这种形式和下面的形式其实相似，只不过将类实例的过程放在了动态代码块中，也是再类装载的时候，就执行动态代码块中的代码，初始化类的实例。优缺点和下面是一样的。
论断；这种单例模式可用，然而可能造成内存节约。懒汉式 (线程不平安)
代码
public class SingletonTest03 {
public static void main(String[] args) {// 测试
System.out.println(“ 懒汉式 1，线程不平安 ”);Singleton instance = Singleton.getInstance();
Singleton instance1 = Singleton.getInstance();System.out.println(instance == instance1);//true
System.out.println(“instance.hashCode=” + instance.hashCode());//1163157884System.out.println(“instance1.hashCode=” + instance1.hashCode());//1163157884
}}
class Singleton {
private static Singleton instance;public Singleton() {}
// 提供一个动态的共有办法，当应用该办法时，才去创立 instance// 即懒汉式
public static Singleton getInstance() {if (instance == null) {
instance = new Singleton();}
return instance;}
} 长处阐明
起到 Lazy Loading 的成果，然而只能再单线程下应用。
如果再多线程下，一个线程进入 if(singlenton == null) 判断语句块，还未来得及往下执行，另一个线程也通过这个判断语句，这是便会差生多个实例。所以再多线程环境下不可应用这种形式。论断：再理论开发中，不要应用这种形式。
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懒汉式(线程平安，同步办法)

代码

class Singleton{
private static Singleton singlenton;

正文完
javascript
发表至： javascript
2021-01-04
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