Java线程超赞学习笔记.docxVIP

不习惯注释，也不习惯看注释，遇到不会的，不懂的，会看看api文档、上网查查用法，不知道是否是一种正确学法。这几个很好的例子，希望对你有帮助！Good luck！1. 创建线程方法apublicclass CreateThread1 {publicstaticvoid main(String arg[]){createThread();}publicstaticvoid createThread(){MyThread mt = new MyThread();Thread t = new Thread(mt);t.start();for(int i=0; i5; i++){System.out.print(a+i+ );}}staticclass MyThread implements Runnable{publicvoid run() {for(int i=0; i5; i++){System.out.print(i+ );}}}}2. 创建线程方法bpublicclass CreateThread2 {publicstaticvoid main(String arg[]){createThread();}publicstaticvoid createThread(){MyThread mt = newMyThread();mt.start();for(int i=0; i5; i++){System.out.print(a+i+ );}}staticclass MyThread extends Thread{publicvoid run(){for(int i=0; i5; i++){System.out.print(i+ );}}}}3. 没有实现线程同步缺点测试publicclass Unsynchronization {publicstaticvoid main(String arg[]){checkUnsynchronization();}publicstaticvoid checkUnsynchronization(){Shop shop = new Shop(10);Buy buy1 = new Buy(shop, Style, 9);Buy buy2 = new Buy(shop, Anita, 8);buy1.start();buy2.start();}staticclass Shop{privateintstock;public Shop(int stock){this.stock = stock;}publicvoid buyGoods(int n){if(nstock){try {Thread.sleep(2000);} catch (Exception e) {e.printStackTrace();}stock-=n;System.out.println(You hava bought +n+, and this shop has +stock+ left.);}else{System.out.println(stock is not enough);}}}staticclass Buy extends Thread{privateintn;private Shop shop;public Buy(Shop shop, String buyer, int n){this.n = n;this.shop = shop;this.setName(buyer);}publicvoid run(){shop.buyGoods(n);}}}4. 将上述例子实现线程同步：publicclass Synchronized {publicstaticvoid main(String arg[]){checkUnsynchronization();}publicstaticvoid checkUnsynchronization(){Shop shop = new Shop(10);Buy buy1 = new Buy(shop, Style, 9);Buy buy2 = new Buy(shop, Anita, 8);buy1.start();buy2.start();}staticclass Shop{privateintstock;public Shop(int stock){this.stock = stock;}publicsynchronizedvoid buyGoods(int n){if(nstock){try {Thread.sleep(2000);//the purpose of sleep is to create a chance of buying at the same time.} catc