71 java多线程_3 _线程状态与常见方法线程状态（基本四状态）
线程常见方法sleep()休眠
public static void sleep(long millis) 当前线程主动休眠millis毫秒。
package com.wlw.thread;public class SleepThread extends Thread { @Override public void run() { for (int i = 0; i < 10; i++) { System.out.println(Thread.currentThread().getName()+”………..”+i); //主动休眠1秒 try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } }}package com.wlw.thread;public class TestSleep { public static void main(String[] args) { SleepThread sleepThread1 = new SleepThread(); sleepThread1.start(); SleepThread sleepThread2 = new SleepThread(); sleepThread2.start(); }}/*运行结果表现为 停顿一下 运行 停顿一下 运行…… */yield() 放弃(让出)
public static void yield() 当前线程主动放弃时间片，回到就绪状态，竞争下一次时间片。
package com.wlw.thread;public class YieldThread extends Thread { @Override public void run() { for (int i = 0; i < 10; i++) { System.out.println(Thread.currentThread().getName()+”———–“+i); //主动放弃当前时间片，参与下一次的竞争 Thread.yield(); } }}package com.wlw.thread;public class TestYield { public static void main(String[] args) { YieldThread yieldThread1 = new YieldThread(); YieldThread yieldThread2 = new YieldThread(); yieldThread1.start(); yieldThread2.start(); }}/*运行结果表现为 两个线程交替运行，偶尔见到一个线程连续运行两次。。。。。。*/join() 加入
public final void join() 允许其他线程加入到当前线程中。
package com.wlw.thread;public class JoinThread extends Thread { @Override public void run() { for (int i = 0; i < 50; i++) { System.out.println(Thread.currentThread().getName()+”———-“+i); //休眠0.5秒 try { Thread.sleep(500); } catch (InterruptedException e) { e.printStackTrace(); } } }}package com.wlw.thread;public class TestJoin { public static void main(String[] args) { JoinThread joinThread = new JoinThread(); joinThread.start(); // joinThread 这个线程加入当前线程（当前线程为main）， // 并阻塞当前线程，直到加入的线程（joinThread）执行完毕，再继续执行当前线程 try { joinThread.join(); } catch (InterruptedException e) { e.printStackTrace(); } //主线程执行的 for (int i = 0; i < 15; i++) { System.out.println(Thread.currentThread().getName()+”===========”+i); } }}线程对象.setPriority() 设置优先级线程对象. setPriority(),线程优先级为1-10,默认为5,优先级越高，表示获取CPU机会越多。package com.wlw.thread;public class PriorityThread extends Thread { @Override public void run() { for (int i = 0; i < 50; i++){ System.out.println(Thread.currentThread().getName()+”——————“+i); } }}package com.wlw.thread;public class TestPriority { public static void main(String[] args) { PriorityThread thread1 = new PriorityThread(); PriorityThread thread2 = new PriorityThread(); PriorityThread thread3 = new PriorityThread(); //设置优先级 thread1.setPriority(1); thread3.setPriority(10); //启动线程 thread1.start(); thread2.start(); thread3.start(); }}线程对象.setDaemon (true) 设置为守护线程线程对象. setDaemon (true) ;设置为守护线程线程有两类：用户线程(前台线程)、守护线程(后台线程)如果程序中所有前台线程都执行完毕了，后台线程会自动结束。垃圾回收器线程属于守护线程package com.wlw.thread;public class DaemonThread extends Thread { @Override public void run() { for (int i = 0; i < 30; i++) { System.out.println(Thread.currentThread().getName()+”——–“+i); //休眠0.5秒 try { Thread.sleep(500); } catch (InterruptedException e) { e.printStackTrace(); } } }}package com.wlw.thread;public class TestDaemon { public static void main(String[] args) { //创建线程对象 DaemonThread daemonThread = new DaemonThread(); //将daemonThread 该线程设置为守护线程（后台线程） //在启动之前设置，并且当前台线程运行完之后，守护线程也会结束 daemonThread.setDaemon(true); //启动线程 daemonThread.start(); //main 主线程属于前台线程（用户线程） for (int i = 0; i < 10; i++) { System.out.println(“主线程main==================”+i); try { Thread.sleep(200); } catch (InterruptedException e) { e.printStackTrace(); } } }}/*执行结果： 因为前台线程（main）执行完毕,所以守护线程也结束主线程main==================0Thread-0——–0主线程main==================1主线程main==================2Thread-0——–1主线程main==================3主线程main==================4Thread-0——–2主线程main==================5主线程main==================6主线程main==================7Thread-0——–3主线程main==================8主线程main==================9Thread-0——–4*/线程等待状态
线程阻塞状态
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