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177 lines (148 loc) · 3.31 KB
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package com.bage.study.java.multhread;
/**
* 多线程模拟抢票、多线程下的单例模式实现
* @author bage
*
*/
public class ThreadCon {
public static int count = 10;
public int i = 10;
public static void ThreadSomeThing(String i) {
getCount(i);
// getInstance(i);
}
public static void main(String[] args) throws Exception {
// 实现方式
thread();
}
private static void thread() throws Exception {
Thread thread1 = new Thread(){
public void run() {
ThreadSomeThing("1");
}
};
Thread thread2 = new Thread(){
public void run() {
ThreadSomeThing("2");
}
};
Thread thread3 = new Thread(){
public void run() {
ThreadSomeThing("3");
}
};
Thread thread4 = new Thread(){
public void run() {
ThreadSomeThing("4");
}
};
Thread thread5 = new Thread(){
public void run() {
ThreadSomeThing("5");
}
};
thread1.start();
thread2.start();
thread3.start();
thread4.start();
thread5.start();
}
/**
* 模拟抽奖
* @param i
*/
public synchronized static void getCount(String i) {
if(count > 0){
System.out.println("thread"+i+":" + count);
count --;
}
}
public static void getInstance(String i) {
System.out.println("thread"+i+":" + SingleInstanceClass5.getInstance());
}
}
/**
* 线程安全
* @author bage
*
*/
class SingleInstanceClass{
private static SingleInstanceClass SingleInstanceClass = new SingleInstanceClass();
private SingleInstanceClass(){
}
public static SingleInstanceClass getInstance(){
return SingleInstanceClass;
}
}
/**
* 线程不安全
* @author bage
*
*/
class SingleInstanceClass2{
private static SingleInstanceClass2 SingleInstanceClass;
private SingleInstanceClass2(){
}
public static SingleInstanceClass2 getInstance(){
if(SingleInstanceClass == null){
SingleInstanceClass = new SingleInstanceClass2();
}
return SingleInstanceClass;
}
}
/**
* 线程安全
* @author bage
*
*/
class SingleInstanceClass3{
private static SingleInstanceClass3 SingleInstanceClass;
private SingleInstanceClass3(){
}
public synchronized static SingleInstanceClass3 getInstance(){
if(SingleInstanceClass == null){
SingleInstanceClass = new SingleInstanceClass3();
}
return SingleInstanceClass;
}
}
/**
* 线程安全
* @author bage
*
*/
class SingleInstanceClass4{
private static SingleInstanceClass4 SingleInstanceClass;
private SingleInstanceClass4(){
}
public static SingleInstanceClass4 getInstance(){
// 多个线程会卡在这里，但是不重复进行 new SingleInstanceClass4();
synchronized (SingleInstanceClass4.class) {
if(SingleInstanceClass == null){
SingleInstanceClass = new SingleInstanceClass4();
}
}
return SingleInstanceClass;
}
}
/**
* 线程不安全
* @author bage
*
*/
class SingleInstanceClass5{
private static SingleInstanceClass5 SingleInstanceClass;
private SingleInstanceClass5(){
}
public static SingleInstanceClass5 getInstance(){
if(SingleInstanceClass == null){
// 多个线程会卡在这里，然后会重复进行 new SingleInstanceClass5();，可以增加如下判断[注释掉的部分]
synchronized (SingleInstanceClass5.class) {
// if(SingleInstanceClass == null){
SingleInstanceClass = new SingleInstanceClass5();
// }
}
}
return SingleInstanceClass;
}
}