单例模式优化探索
2015-11-12 12:00
363 查看
package com.xiuye.test;
public class Test12 {
public static void main(String[] args) throws InterruptedException {
//天生线程安全
for (int i = 0; i < 100; i++) {
Thread t = new Thread() {
public void run() {
Singleton s = Singleton.getInstance();
System.out.println(s.hashCode());
}
};
t.start();
t.join();
}
System.out.println("================================");
//非线程安全
for (int i = 0; i < 100; i++) {
Thread t = new Thread() {
public void run() {
Singleton2 s= Singleton2.getInstance();
System.out.println(s.hashCode());
}
};
t.start();
}
}
}
class Singleton {
private Singleton() {
}
private static class SingletonHolder {
private static Singleton instance = new Singleton();
}
public static Singleton getInstance() {
return SingletonHolder.instance;
}
}
class Singleton2{
private static Singleton2 s = null;
private Singleton2(){
}
public static Singleton2 getInstance(){
if(s == null){
s = new Singleton2();
}
return s;
}
}运行结果：
<pre name="code" class="java">18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 18725445 ================================ 5998631 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899 21479899
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