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package com.duoxiancheng;public class Test01_02 {public static void main(String[] args) { // Door d1 = new Door(); // d1.setName("前門"); // Door d2 = new Door(); // d2.setName("中門"); // Door d3 = new Door(); // d3.setName("后門"); // d1.start(); // d2.start(); // d3.start();//創建任務類對象OnBus ob = new OnBus();Thread t1 = new Thread(ob, "前門");Thread t2 = new Thread(ob, "中門");Thread t3 = new Thread(ob, "后門");t1.start();t2.start();t3.start();}}class OnBus implements Runnable {private int seats = 800;@Overridepublic void run() {synchronized (this) {while(true) {if (seats <= 0) {break;}try {Thread.sleep(100);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}seats--;System.out.println(Thread.currentThread().getName() + "上車---還剩" + seats + "個座...");}}}}

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package com.duoxiancheng;public class Test01_上車 {public static void main(String[] args) {BusDoor door = new BusDoor();Thread t1 = new Thread(door,"前門線程->");Thread t2 = new Thread(door,"中門線程->");Thread t3 = new Thread(door,"后門線程->");t1.start();t2.start();t3.start();}}//設計一個門類實現Runnable class BusDoor implements Runnable{private int count = 800;//之所以設置同步，是為了避免在某個線程休眠時，其他多個線程進入執行，所以總票數減的次數增多。線程不安全public synchronized void run() {while (true) {if (count <= 0) {break;}try {Thread.sleep(10);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}count--;System.out.println(Thread.currentThread().getName() + "上車---還剩" + count + "個座...");}} }

第二個例子：

package com.duoxiancheng;public class Test02_02 {public static void main(String[] args) {printNumber print = new printNumber();Thread t1 = new Thread(print,"線程1->");Thread t2 = new Thread(print,"線程2->");Thread t3 = new Thread(print,"線程3->");t1.start();t2.start();t3.start();} }class printNumber implements Runnable{private int end = 200;private int start = 100;@Overridepublic void run() { while(start <= end) {synchronized (this) {try {Thread.sleep(100);} catch (InterruptedException e) {e.printStackTrace();}if (start % 2 == 0) {System.out.println("我是偶數" + start);}else {System.out.println("我是奇數" + start + ",我的名字是:" + Thread.currentThread().getName());}start++;}}} } package com.duoxiancheng;public class Test02 {public static void main(String[] args) {Print print = new Print();Thread t1 = new Thread(print,"線程1->");Thread t2 = new Thread(print,"線程2->");Thread t3 = new Thread(print,"線程3->");t1.start();t2.start();t3.start();} }class Print implements Runnable{@Overridepublic synchronized void run() {for (int i = 100; i <= 200; i++) {if (i % 2 == 0) {System.out.println("輸出偶數"+ i);try {wait();} catch (InterruptedException e) {e.printStackTrace();}}else {System.out.println("輸出奇數" + i +",線程名字:" + Thread.currentThread().getName());notify();}}}}

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?輸出結果的同步代碼塊時，會出現不同線程搶奪資源。

而同步方法，會使一個線程執行完。

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