电商网站 支付宝接口,注册代理公司,wordpress 屏蔽谷歌字体,禁止显示网站目录线程构造器结构 1.线程中的构造器可以使用很多参数 public thread()#xff1a;分配一个新的线程对象public Thread(String name)#xff1a;分配一个指定名字的线程对象public Thread(Runnable target)#xff1a;指定创建线程的目标对象#xff0c;它实现了Runnable接口…线程构造器结构 1.线程中的构造器可以使用很多参数 public thread()分配一个新的线程对象public Thread(String name)分配一个指定名字的线程对象public Thread(Runnable target)指定创建线程的目标对象它实现了Runnable接口中的run方法public Thread(Runnable target, String name)分配一个带有指定目标新的线程对象并指定名字 比如下面的例子主线程输出1-100之内的偶数分线程也输出1100之内的偶数其中用户将分线程重命名为“线程1”: 提示使用extends Thread 同时使用 public Thread(String name)重命名thread package Thread;public class ThreadConsTest {public static void main(String[] args) {//3. 创建该Thread类子类的对象创建Thread子类的实例PrintNumberCons x new PrintNumberCons(线程1);//4. 调用线程对象的start()方法启动该线程x.start();for (int i 0; i 100; i) {if (i % 2 0) {System.out.println(i \t Thread.currentThread().getName());}}}}//5. 如果想实现其他更多线程需要创建新的线程对象不能再次调用已经start的线程。//1. 创建继承Thread类的子类class PrintNumberCons extends Thread {public PrintNumberCons() {}public PrintNumberCons(String name) {super(name);}//2. 重写Thread的run()该run方法体囊括此线程需要完成的各种操作Overridepublic void run() {for (int i 0; i 100; i) {if (i % 2 0) {System.out.println(i \t Thread.currentThread().getName());}}}} 运行结果可以看到“线程1”和“main”线程交替出现 0 线程1 2 线程1 4 线程1 6 线程1 8 线程1 10 线程1 12 线程1 14 线程1 16 线程1 18 线程1 20 线程1 22 线程1 24 线程1 26 线程1 28 线程1 30 线程1 32 线程1 0 main 2 main 4 main 6 main 8 main 10 main 12 main 34 线程1 36 线程1 38 线程1 40 线程1 42 线程1 44 线程1 46 线程1 48 线程1 50 线程1 14 main 16 main 18 main 20 main 22 main 24 main 26 main 28 main 30 main 32 main 34 main 36 main 38 main 40 main 42 main 44 main 46 main 48 main 50 main 52 main 54 main 56 main 58 main 60 main 62 main 64 main 66 main 68 main 70 main 72 main 52 线程1 54 线程1 56 线程1 58 线程1 60 线程1 62 线程1 64 线程1 66 线程1 68 线程1 70 线程1 72 线程1 74 线程1 76 线程1 78 线程1 80 线程1 82 线程1 84 线程1 86 线程1 88 线程1 90 线程1 92 线程1 94 线程1 96 线程1 98 线程1 100 线程1 74 main 76 main 78 main 80 main 82 main 84 main 86 main 88 main 90 main 92 main 94 main 96 main 98 main 100 mainProcess finished with exit code 0 Thread类的常用方法 start()1.启动线程2.调用线程run() run()将线程要执行的操作声明在run()中 currentThread()获取当前执行代码对应的线程 setName()设置线程名 getName()获取线程名 sleep(long millis)静态方法调用时会让当前线程睡眠括号里的毫秒数 yield()静态方法一旦调用该线程直接释放CPU的执行权(注意本thread释放CPU之后有可能又迅速的在公平竞争中把CPU抢回来了所以用户未必能在结果中体会到这个CPU的释放)比如Thread.yield() join()在线程A通过线程B调用join表示线程A进入阻塞状态CPU直接去执行线程B直到线程B执行结束线程A停止阻塞再继续执行。 isAlive()判断当前线程是否存活 stop()已过时 不建议使用强行结束线程直接死亡。可能会出现收尾工作没有做完比如关闭文件数据库等同时会立刻释放该线程所有的锁导致数据不同步等问题。 suspend() resume()已经过时不建议使用。操作其暂停和恢复必须成对出现否则非常容易发生死锁。suspend()会导致线程暂停但不释放任何锁资源其它线程都无法访问被它占用的锁直到resume(). 先看一个使用join的例子 package ThreadPool;public class Test2 {public static void main(String[] args) {Thread t_add new Thread (){public void run() {for (int i 0; i 100; i) {System.out.println(Thread.currentThread().getName() is printing i);}}};Thread t_minus new Thread (){public void run() {try {t_add.join(); //在t_minus里面调用t_add这句的意思是等着t_add执行完毕再执行下面的t_minus内容} catch (InterruptedException e) {e.printStackTrace();}for (int i 100; i 0; i--) {System.out.println(Thread.currentThread().getName() is printing i);}}};//尽管 t_minus是先于t_add开始start的因为有着上面的join()控制 //t_add.start仍是先执行的。t_minus.start();t_add.start();}} 运行结果 Thread-0 is printing 0 Thread-0 is printing 1 Thread-0 is printing 2 Thread-0 is printing 3 Thread-0 is printing 4 Thread-0 is printing 5 Thread-0 is printing 6 Thread-0 is printing 7 Thread-0 is printing 8 Thread-0 is printing 9 Thread-0 is printing 10 Thread-0 is printing 11 Thread-0 is printing 12 Thread-0 is printing 13 Thread-0 is printing 14 Thread-0 is printing 15 Thread-0 is printing 16 Thread-0 is printing 17 Thread-0 is printing 18 Thread-0 is printing 19 Thread-0 is printing 20 Thread-0 is printing 21 Thread-0 is printing 22 Thread-0 is printing 23 Thread-0 is printing 24 Thread-0 is printing 25 Thread-0 is printing 26 Thread-0 is printing 27 Thread-0 is printing 28 Thread-0 is printing 29 Thread-0 is printing 30 Thread-0 is printing 31 Thread-0 is printing 32 Thread-0 is printing 33 Thread-0 is printing 34 Thread-0 is printing 35 Thread-0 is printing 36 Thread-0 is printing 37 Thread-0 is printing 38 Thread-0 is printing 39 Thread-0 is printing 40 Thread-0 is printing 41 Thread-0 is printing 42 Thread-0 is printing 43 Thread-0 is printing 44 Thread-0 is printing 45 Thread-0 is printing 46 Thread-0 is printing 47 Thread-0 is printing 48 Thread-0 is printing 49 Thread-0 is printing 50 Thread-0 is printing 51 Thread-0 is printing 52 Thread-0 is printing 53 Thread-0 is printing 54 Thread-0 is printing 55 Thread-0 is printing 56 Thread-0 is printing 57 Thread-0 is printing 58 Thread-0 is printing 59 Thread-0 is printing 60 Thread-0 is printing 61 Thread-0 is printing 62 Thread-0 is printing 63 Thread-0 is printing 64 Thread-0 is printing 65 Thread-0 is printing 66 Thread-0 is printing 67 Thread-0 is printing 68 Thread-0 is printing 69 Thread-0 is printing 70 Thread-0 is printing 71 Thread-0 is printing 72 Thread-0 is printing 73 Thread-0 is printing 74 Thread-0 is printing 75 Thread-0 is printing 76 Thread-0 is printing 77 Thread-0 is printing 78 Thread-0 is printing 79 Thread-0 is printing 80 Thread-0 is printing 81 Thread-0 is printing 82 Thread-0 is printing 83 Thread-0 is printing 84 Thread-0 is printing 85 Thread-0 is printing 86 Thread-0 is printing 87 Thread-0 is printing 88 Thread-0 is printing 89 Thread-0 is printing 90 Thread-0 is printing 91 Thread-0 is printing 92 Thread-0 is printing 93 Thread-0 is printing 94 Thread-0 is printing 95 Thread-0 is printing 96 Thread-0 is printing 97 Thread-0 is printing 98 Thread-0 is printing 99 Thread-0 is printing 100 Thread-1 is printing 100 Thread-1 is printing 99 Thread-1 is printing 98 Thread-1 is printing 97 Thread-1 is printing 96 Thread-1 is printing 95 Thread-1 is printing 94 Thread-1 is printing 93 Thread-1 is printing 92 Thread-1 is printing 91 Thread-1 is printing 90 Thread-1 is printing 89 Thread-1 is printing 88 Thread-1 is printing 87 Thread-1 is printing 86 Thread-1 is printing 85 Thread-1 is printing 84 Thread-1 is printing 83 Thread-1 is printing 82 Thread-1 is printing 81 Thread-1 is printing 80 Thread-1 is printing 79 Thread-1 is printing 78 Thread-1 is printing 77 Thread-1 is printing 76 Thread-1 is printing 75 Thread-1 is printing 74 Thread-1 is printing 73 Thread-1 is printing 72 Thread-1 is printing 71 Thread-1 is printing 70 Thread-1 is printing 69 Thread-1 is printing 68 Thread-1 is printing 67 Thread-1 is printing 66 Thread-1 is printing 65 Thread-1 is printing 64 Thread-1 is printing 63 Thread-1 is printing 62 Thread-1 is printing 61 Thread-1 is printing 60 Thread-1 is printing 59 Thread-1 is printing 58 Thread-1 is printing 57 Thread-1 is printing 56 Thread-1 is printing 55 Thread-1 is printing 54 Thread-1 is printing 53 Thread-1 is printing 52 Thread-1 is printing 51 Thread-1 is printing 50 Thread-1 is printing 49 Thread-1 is printing 48 Thread-1 is printing 47 Thread-1 is printing 46 Thread-1 is printing 45 Thread-1 is printing 44 Thread-1 is printing 43 Thread-1 is printing 42 Thread-1 is printing 41 Thread-1 is printing 40 Thread-1 is printing 39 Thread-1 is printing 38 Thread-1 is printing 37 Thread-1 is printing 36 Thread-1 is printing 35 Thread-1 is printing 34 Thread-1 is printing 33 Thread-1 is printing 32 Thread-1 is printing 31 Thread-1 is printing 30 Thread-1 is printing 29 Thread-1 is printing 28 Thread-1 is printing 27 Thread-1 is printing 26 Thread-1 is printing 25 Thread-1 is printing 24 Thread-1 is printing 23 Thread-1 is printing 22 Thread-1 is printing 21 Thread-1 is printing 20 Thread-1 is printing 19 Thread-1 is printing 18 Thread-1 is printing 17 Thread-1 is printing 16 Thread-1 is printing 15 Thread-1 is printing 14 Thread-1 is printing 13 Thread-1 is printing 12 Thread-1 is printing 11 Thread-1 is printing 10 Thread-1 is printing 9 Thread-1 is printing 8 Thread-1 is printing 7 Thread-1 is printing 6 Thread-1 is printing 5 Thread-1 is printing 4 Thread-1 is printing 3 Thread-1 is printing 2 Thread-1 is printing 1 Thread-1 is printing 0Process finished with exit code 0 下面的例子使用到了Thread类其他常见的method package Thread;import static java.lang.Thread.currentThread; import static java.lang.Thread.sleep;public class ThreadConsTest {public static void main(String[] args) throws InterruptedException {//3. 创建该Thread类子类的对象创建Thread子类的实例PrintNumberCons x new PrintNumberCons(线程1);//4. 调用线程对象的start()方法启动该线程x.setName(线程1计算能被2整除的数);x.start();Thread.currentThread().setName(主线程main在计算--不能被3整除的数);for (int i 0; i 30; i) {if (i % 3 ! 0) {currentThread().sleep(800);if(i8) x.join();System.out.println(i \t Thread.currentThread().getName());}}System.out.println(主线程main还活着吗 Thread.currentThread().isAlive());System.out.println(线程1还活着吗 x.isAlive());}}//5. 如果想实现其他更多线程需要创建新的线程对象不能再次调用已经start的线程。//1. 创建继承Thread类的子类class PrintNumberCons extends Thread {public PrintNumberCons() {}public PrintNumberCons(String name) {super(name);}//2. 重写Thread的run()该run方法体囊括此线程需要完成的各种操作Overridepublic void run() {for (int i 0; i 20; i) {if (i 5){Thread.yield();}//if (i16) currentThread().yield();if(i16) {try {currentThread().join(1000);} catch (InterruptedException e) {throw new RuntimeException(e);}}if (i % 2 0) {if (i 16) currentThread().yield();try {sleep(800);} catch (InterruptedException e) {throw new RuntimeException(e);}System.out.println(i \t Thread.currentThread().getName());}}}} 运行结果 1 主线程main在计算--不能被3整除的数 0 线程1计算能被2整除的数 2 线程1计算能被2整除的数 2 主线程main在计算--不能被3整除的数 4 线程1计算能被2整除的数 4 主线程main在计算--不能被3整除的数 6 线程1计算能被2整除的数 5 主线程main在计算--不能被3整除的数 8 线程1计算能被2整除的数 7 主线程main在计算--不能被3整除的数 10 线程1计算能被2整除的数 12 线程1计算能被2整除的数 14 线程1计算能被2整除的数 16 线程1计算能被2整除的数 18 线程1计算能被2整除的数 20 线程1计算能被2整除的数 8 主线程main在计算--不能被3整除的数 10 主线程main在计算--不能被3整除的数 11 主线程main在计算--不能被3整除的数 13 主线程main在计算--不能被3整除的数 14 主线程main在计算--不能被3整除的数 16 主线程main在计算--不能被3整除的数 17 主线程main在计算--不能被3整除的数 19 主线程main在计算--不能被3整除的数 20 主线程main在计算--不能被3整除的数 22 主线程main在计算--不能被3整除的数 23 主线程main在计算--不能被3整除的数 25 主线程main在计算--不能被3整除的数 26 主线程main在计算--不能被3整除的数 28 主线程main在计算--不能被3整除的数 29 主线程main在计算--不能被3整除的数 主线程main还活着吗 true 线程1还活着吗 falseProcess finished with exit code 0 线程的优先级 getPriority()获取线程的优先级 setPriority()设置线程的优先级 范围 【1-10】 Thread类内部声明的三个常量 public static final int MIN_PRIORITY 1; 最低优先级public static final int NORM_PRIORITY 5; 默认优先级public static final int MAX_PRIORITY 10; 最高优先级 下面的例子中括号里分别用了数字和来定义setPriority()都是可以使用的值得注意的是对于多核CPU资源抢占获得的优先级在运行结果处并不是十分明显。 package Thread;import static java.lang.Thread.currentThread; import static java.lang.Thread.sleep;public class ThreadConsTest {public static void main(String[] args) throws InterruptedException {//3. 创建该Thread类子类的对象创建Thread子类的实例PrintNumberCons x new PrintNumberCons(线程1);//4. 调用线程对象的start()方法启动该线程x.setName(线程1计算能被2整除的数);x.setPriority(7); //也可以写 x.setPriority(MAX_PRIORITY);x.start();Thread.currentThread().setName(主线程main在计算--不能被3整除的数);Thread.currentThread().setPriority(2);//也可以写 Thread.currentThread().setPriority(MIN_PRIORITY);for (int i 0; i 30; i) {if (i % 3 ! 0) {currentThread().sleep(800);if(i8) x.join();System.out.println(i \t Thread.currentThread().getName());}}System.out.println(主线程main还活着吗 Thread.currentThread().isAlive());System.out.println(线程1还活着吗 x.isAlive());}}//5. 如果想实现其他更多线程需要创建新的线程对象不能再次调用已经start的线程。//1. 创建继承Thread类的子类class PrintNumberCons extends Thread {public PrintNumberCons() {}public PrintNumberCons(String name) {super(name);}//2. 重写Thread的run()该run方法体囊括此线程需要完成的各种操作Overridepublic void run() {for (int i 0; i 20; i) {if (i 5){Thread.yield();}//if (i16) currentThread().yield();if(i16) {try {currentThread().join(1000);} catch (InterruptedException e) {throw new RuntimeException(e);}}if (i % 2 0) {if (i 16) currentThread().yield();try {sleep(800);} catch (InterruptedException e) {throw new RuntimeException(e);}System.out.println(i \t Thread.currentThread().getName());}}}} 运行结果 0 线程1计算能被2整除的数 1 主线程main在计算--不能被3整除的数 2 线程1计算能被2整除的数 2 主线程main在计算--不能被3整除的数 4 线程1计算能被2整除的数 4 主线程main在计算--不能被3整除的数 6 线程1计算能被2整除的数 5 主线程main在计算--不能被3整除的数 8 线程1计算能被2整除的数 7 主线程main在计算--不能被3整除的数 10 线程1计算能被2整除的数 12 线程1计算能被2整除的数 14 线程1计算能被2整除的数 16 线程1计算能被2整除的数 18 线程1计算能被2整除的数 20 线程1计算能被2整除的数 8 主线程main在计算--不能被3整除的数 10 主线程main在计算--不能被3整除的数 11 主线程main在计算--不能被3整除的数 13 主线程main在计算--不能被3整除的数 14 主线程main在计算--不能被3整除的数 16 主线程main在计算--不能被3整除的数 17 主线程main在计算--不能被3整除的数 19 主线程main在计算--不能被3整除的数 20 主线程main在计算--不能被3整除的数 22 主线程main在计算--不能被3整除的数 23 主线程main在计算--不能被3整除的数 25 主线程main在计算--不能被3整除的数 26 主线程main在计算--不能被3整除的数 28 主线程main在计算--不能被3整除的数 29 主线程main在计算--不能被3整除的数 主线程main还活着吗 true 线程1还活着吗 false