Java线程调度 - 极悦
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Java线程基础操作 Java线程同步

Java线程调度

Java线程优先级

package com.wkcto.chapter07.method;
/**
 * 线程优先级
 * 	1) 优先级的取值范围: 1 ~ 10
 * 	2) 所有线程默认的优先级; 5
 * 	3) 优先级越高, 获得CPU执行权的机率越大
 * 	4) t1.setPriority( 10 )  设置线程优先级
 * @author 蛙课网
 *
 */
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);
		}
	}

}
Java线程睡眠
package com.wkcto.chapter07.method;
/**
 * 线程睡眠 ( 休眠 )
 * 	 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 蛙课网
 *
 */
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线程
		for( int i = 1 ; i<=100; i++){
			System.out.println( Thread.currentThread().getName() + "-----> " + i);
			//当i==10时, 让t1线程睡眠 
			/*try {
				t1.sleep(3000); 		//虽然是t1调用,实际上是main线程睡眠 
			} catch (InterruptedException e) {
				e.printStackTrace();
			}*/
		}
		
		System.out.println( t1.getState() );  		//TIMED_WAITING , t1处于sleep()睡眠 状态
	}

}
Java线程中断
package com.wkcto.chapter07.method;
/**
 * 线程中断
 * 		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 蛙课网
 *
 */
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() );
	}

}
package com.wkcto.chapter07.method;
/**
 * 判断线程的中断状态
 * 		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 蛙课网
 *
 */
public class Test07 {

	public static void main(String[] args) {
		Thread t1 = new Thread(new Runnable() {
			@Override
			public void run() {
//				如果线程没有被中断,就一直打印字符串
				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() {
//				如果线程没有被中断,就一直打印字符串
				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();
	}

}

Java线程让步

package com.wkcto.chapter07.method;
/**
 * 线程让步
 * 		Thread.yield(); 
 * 		把运行中的线程转换为就绪状态
 * @author 蛙课网
 *
 */
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();
	}

}

Java线程合并

package com.wkcto.chapter07.method;
/**
 * 线程合并
 * 		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 蛙课网
 *
 */
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();   	//现在加入t1线程,  当前线程转为等待状态, 等到t1执行完后,t2当前线程再转为就绪状态
							t1.join(1000);  //如果当前线程等待1000毫秒后, 不管t1线程是否结束 ,都会转为就绪状态
						} catch (InterruptedException e) {
							e.printStackTrace();
						} 		
					}
				}
			}
		} , "t2");
		t2.start();
	}

}

Java线程终止

package com.wkcto.chapter07.method;
/**
 * 终止线程
 * 	相办法让run()结束 
 * 	可以为线程设计一个布尔标志, 在run()方法中定期判断这个标志,来决定是否结束 run()
 * @author 蛙课网
 *
 */
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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