//后臺進程 /** 對于java來說只要還有一個前臺線程在運行，這個進程就不結束，如果一個進程* 只有后臺線程，這個進程就會結束*/ package xian_cheng;public class Example06 {public static void main(String[] args) {// TODO Auto-generated method stubSystem.out.println("main線程是后臺線程嗎?"+Thread.currentThread().isDaemon());DamonThtead dt=new DamonThtead();//創建一個DamonThread對象dt;Thread t=new Thread(dt,"后臺線程");//創建線程t共享dt資源System.out.println("t線程是后臺線程嗎？"+t.isDaemon());//java默認的是前臺進程/**注意要將某個線程設置為后臺線程，必須在該線程啟動之前*t.setDaemon(true);語句必須位于t.start之前*/t.setDaemon(true);//將線程t設置為后臺線程t.start(); //開啟線程for (int i = 0; i < 10; i++) {System.out.println(i);}}} class DamonThtead implements Runnable{public void run(){while (true) {System.out.println(Thread.currentThread().getName()+"------is running");}}}//線程的優先級 package xian_cheng; import java.security.PublicKey;public class Example07 {public static void main(String[] args) {// TODO Auto-generated method stubThread minThread=new Thread(new MinPriority(),"優先級較低的線程");Thread maxThread=new Thread(new MaxPriority(),"優先級較gao的線程");minThread.setPriority(Thread.MIN_PRIORITY);maxThread.setPriority(10);maxThread.start();minThread.start();}}//定義類MaxPriority實現Runnable接口 class MaxPriority implements Runnable{public void run(){for (int i = 0; i < 10; i++) {System.out.println(Thread.currentThread().getName()+"正在輸出："+i);}} } //定義類MinPriority實現Runnable接口 class MinPriority implements Runnable{public void run(){for (int i = 0; i < 10; i++) {System.out.println(Thread.currentThread().getName()+"正在輸出："+i);}} }/線程的休眠package xian_cheng; /** 線程的休眠，它能使線程進入阻塞狀態* sleep方法聲明拋出InterruptedException異常* 當線程調用sleep()方法后在指定的時間內該線程是不會執行的* sleep()是靜態方法只能控制當前正在運行的線程* */ public class Example08 {public static void main(String[] args) throws InterruptedException {// TODO Auto-generated method stubThread thread=Thread.currentThread();System.out.println(thread.getName());new Thread(new SleepThread()).start();for (int i = 0; i < 10; i++) {if (i==5) {Thread.sleep(2000);}System.out.println("主線程正在輸出："+i);Thread.sleep(500);}}} class SleepThread implements Runnable{public void run(){for (int i = 0; i < 10; i++) {if (i==3) {try {Thread.sleep(2000);//當前線程休眠2秒} catch (InterruptedException e) {// TODO: handle exceptione.printStackTrace();}}System.out.println("線程一正在輸出："+i);try {Thread.sleep(2000);//當前線程休眠2秒} catch (InterruptedException e) {// TODO: handle exceptione.printStackTrace();}}} } /線程讓步 package xian_cheng; /** 線程讓步通過yield()方法來實現，與sleep()的區別是它不會阻塞該線程，* 只是將線程轉換為就緒狀態*/ public class Example09 {public static void main(String[] args) {// TODO Auto-generated method stubThread t1=new YieldThread("線程A");Thread t2=new YieldThread("線程B");t1.start();t2.start();}}class YieldThread extends Thread{public YieldThread(String name){super(name);//調用父類的構造方法}public void run(){for (int i = 0; i < 10; i++) {System.out.println(Thread.currentThread().getName()+"---"+i);if (i==3) {System.out.print("線程讓步：");Thread.yield();//線程做出讓步}}}}/線程同步 package xian_cheng; /** 線程同步*/ public class Example12 {public static void main(String[] args) {// TODO Auto-generated method stubTicket1 ticket1=new Ticket1();new Thread(ticket1,"窗口1").start();new Thread(ticket1,"窗口2").start();new Thread(ticket1,"窗口3").start();}}class Ticket1 implements Runnable{private int tickets=10;Object look=new Object();//定義一個對象作為同步代碼塊的鎖/** 注意鎖對象的創建代碼不能放在run方法中，否者每個線程運行到run()方法都會* 創建一個鎖，這樣每個線程都有一個不同的鎖，每一個鎖都有一個自己的標志位。* 線程之間便不能產生同步的效果*/public void run(){while (true) {synchronized (look) {try {Thread.sleep(1000);} catch (InterruptedException e) {// TODO: handle exceptione.printStackTrace();}if (tickets>0) {System.out.println(Thread.currentThread().getName()+"---賣出的票"+tickets--);}else {break;}}}} }

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