Java thread scheduling-power node

package com.wkcto.chapter07.method;
/**

• Thread priority
• 1. Priority value range: 1 ~ 10
• 2. The default priority of all threads; 5
• 3. The higher the priority, the greater the chance of obtaining CPU execution rights
• 4. t1.setPriority( 10) Set thread priority
• @author frog class network

*/
public class Test04 {

public static void main(String[] args) {
	Thread t1 = new Thread(new Runnable() {
		@Override
		public void run() {
			for(int i = 1; i <= 100; i++){
				System.out.println( Thread.currentThread().getName() + "-->" + i);
			}
		}
	} , "t1");
	t1.setPriority(1); 				//设置优先级
	t1.start();
	
	Thread t2 = new Thread(new Runnable() {
		@Override
		public void run() {
			for(int i = 1; i <= 100; i++){
				System.out.println( Thread.currentThread().getName() + "-->" + i);
			}
		}
	} , "t2");
	t2.setPriority(10); 		//设置优先级
	t2.start();
	
	//打印线程的优先级
	System.out.println( "t1 priority: " + t1.getPriority());
	System.out.println( "t2 priority: " + t2.getPriority());
	System.out.println( "main priority: " + Thread.currentThread().getPriority());
	
	//main线程
	for(int i = 1; i <= 100; i++){
		System.out.println( Thread.currentThread().getName() + "-->" + i);
	}
}

}
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Java thread sleep

package com.wkcto.chapter07.method;
/**

• Thread sleep (sleep)
• Thread.sleep( 2000 );

•  1) 是静态方法, 通过Thread类名直接调用
  

•  2) 睡眠的单位 是毫秒, 1秒 == 1000 毫秒
  

•  3) sleep()有受检异常需要预处理
  

•  4) sleep()方法所在的线程睡眠 
  

• @author frog class network

*/
public class Test05 {

public static void main(String[] args) {
	Thread t1 = new Thread(new Runnable() {
		@Override
		public void run() {
			for( int i = 1 ; i<=100; i++){
				System.out.println( Thread.currentThread().getName() + "--> " + i);
				//当 i == 50 时, 线程休眠
				if ( i == 50 ) {
					//run()是重写了Runnable接口中run(),不能声明抛出异常,只能捕获处理
					try {
						Thread.sleep(3000);			//睡眠3秒
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
			}
		}
	}, "t1");
	t1.start();

// t1 = null;
//main thread
for( int i = 1; i<=100; i++){ System.out.println( Thread.currentThread().getName() + "-----> "+ i); //When i==10, let t1 thread sleep / try { t1.sleep(3000); //Although it is t1 call, it is actually the main thread sleep } catch (InterruptedException e) { e.printStackTrace( ); } / }

	System.out.println( t1.getState() );  		//TIMED_WAITING , t1处于sleep()睡眠 状态
}

}
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Java thread interruption

package com.wkcto.chapter07.method;
/**

• Thread interruption

•  t1.interrupt();		中断t1线程
  

•  一般是把处于睡眠 / 等待中的线程给唤醒 
  

• @author frog class network

*/
public class Test06 {

public static void main(String[] args) {
	Thread t1 = new Thread(new Runnable() {
		@Override
		public void run() {
			for( int i = 1 ; i<=100; i++){
				System.out.println( Thread.currentThread().getName() + "--> " + i);
				//当 i == 50 时, 线程休眠
				if ( i == 50 ) {
					try {
						Thread.sleep(10000);			//睡眠10秒
					} catch (InterruptedException e) {

// e.printStackTrace ();
}
}
}
}
}, “T1”);
t1.start ();

	//main线程
	for( int i = 1 ; i<=100; i++){
		System.out.println( Thread.currentThread().getName() + "--> " + i);
	}
	
	//当main线程结束 , 把t1线程唤醒
	t1.interrupt();  		//中断t1线程的睡眠, 会抛出中断异常

// System.out.println( t1.isInterrupted() );
}

}
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package com.wkcto.chapter07.method;
/**

• Determine the interrupt status of the thread

•  t1.isInterrupted(), 实例方法判断线程的中断状态, 返回true后,不会清除线程的中断标志
  

•  Thread.interrupted(), 静态方法判断线程的中断状态, 如果返回true表示线程被中断了, 然后会清除线程的中断标志
  

•  		再判断线程的中断状态时, 就是false
  

• @author frog class network

*/
public class Test07 {

public static void main(String[] args) {
	Thread t1 = new Thread(new Runnable() {
		@Override
		public void run() {

// If the thread is not interrupted, it keeps printing the string
while(! Thread.currentThread().isInterrupted() ){ System.out.println("wkcto"); } System.out.println("11: "+ Thread.currentThread().isInterrupted()); } }); t1.start();

	Thread t2 = new Thread(new Runnable() {
		@Override
		public void run() {

// If the thread is not interrupted, always print the string
while(! Thread.interrupted() ){ System.out.println(“bjpowernode”); } System.out.println("22: "+ Thread.currentThread( ).isInterrupted()); } }); t2.start();

	// main线程
	for (int i = 1; i <= 50; i++) {
		System.out.println(Thread.currentThread().getName() + "--> " + i);
	}
	
	//main线程结束, 就中断t1线程
	t1.interrupt();
	t2.interrupt();
}

}
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Java thread concessions

package com.wkcto.chapter07.method;
/**

• Thread concession

•  Thread.yield(); 
  

•  把运行中的线程转换为就绪状态
  

• @author frog class network

*/
public class Test08 {

public static void main(String[] args) {
	Thread t1 = new Thread(new Runnable() {
		@Override
		public void run() {
			for (int i = 1; i <= 100; i++) {
				System.out.println(Thread.currentThread().getName() + "--> " + i);
				//当 i的值是10的倍数时, 线程让步
				if ( i % 10 == 0) {
					Thread.yield();  	//转换为就绪状态
				}
			}
		}
	} , "t1");
	t1.start();
	
	Thread t2 = new Thread(new Runnable() {
		@Override
		public void run() {
			for (int i = 1; i <= 100; i++) {
				System.out.println(Thread.currentThread().getName() + "-====> " + i);
			}
		}
	} , "t2");
	t2.start();
}

}
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Java thread merging

package com.wkcto.chapter07.method;
/**

• Thread merging

•  t1.join();  	在当前线程中加入t1线程,当前线程转为等待状态, 等到t1线程执行完毕后,当前线程再转为就绪状态
  

• @author frog class network

*/
public class Test09 {

public static void main(String[] args) {
	Thread t1 = new Thread(new Runnable() {
		@Override
		public void run() {
			for (int i = 1; i <= 100; i++) {
				System.out.println(Thread.currentThread().getName() + "--> " + i);
			}
		}
	} , "t1");
	t1.start();
	
	Thread t2 = new Thread(new Runnable() {
		@Override
		public void run() {
			for (int i = 1; i <= 100; i++) {
				System.out.println(Thread.currentThread().getName() + "-====> " + i);
				//当i==10时, 把t1线程合并进来
				if ( i == 10 ) {
					try {

// t1.join(); //Now join the t1 thread, the current thread turns to the waiting state, and after the execution of t1, the current thread of t2 turns to the ready state
t1.join(1000); //If the current thread waits for 1000 after ms, regardless of whether the end of the thread t1, into the ready state will
} the catch (InterruptedException E) { e.printStackTrace (); } } } } }, "T2"); t2.start (); }

}
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Java thread termination

package com.wkcto.chapter07.method;
/**

• Terminate thread
• Phase method to end run()
• You can design a boolean flag for the thread, and periodically judge this flag in the run() method to decide whether to end the run()
• @author frog class network

*/
public class Test11 {

public static void main(String[] args) {
	SubThread1 thread1 = new SubThread1();
	thread1.start();
	
	Prime3 prime3 = new Prime3();
	Thread t2 = new Thread(prime3);
	t2.start();
	
	//main线程
	for (int i = 1; i <= 50; i++) {
		System.out.println(Thread.currentThread().getName() + "========> " + i);
	}
	//main线程结束 , 终止t1线程
	thread1.stopping = true;
	prime3.running = false;
}

}

class SubThread1 extends Thread{
boolean stopping = false;
@Override
public void run() {
for (int i = 1; i <= 500; i++) {
if (stopping) {
return; //结束方法的执行
}
System.out.println(Thread.currentThread().getName() + "–> " + i);
}
}
}

class Prime3 implements Runnable{
boolean running = true;
@Override
public void run() {
for( int i = 1; running && i<=500; i++){
System.out.println(Thread.currentThread().getName() + "–> " + i);
}
}
}
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