Java多线程-线程常用方法

Java多线程-线程常用方法

1，getName(); 返回该线程的名称。

2，currentThread()；返回对当前正在执行的线程对象的引用。

3，isAlive()；测试线程是否处于活动状态。

4，sleep()；线程休眠。

5，setPriority(int newPriority)；更改线程的优先级。

6，yield()；暂停当前正在执行的线程对象，并执行其他线程。

下面给出一些实例：

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package com.java1234.chap09.sec04; public class Demo1  implements Runnable{ @Override public void run() { // TODO Auto-generated method stub for ( int i= ;i< 10 ;i++){ // 获取当前线程 Thread t=Thread.currentThread(); System.out.println(t.getName()+ ":" +i);  // 返回线程的名称 } } public static void main(String[] args) { Demo1 demo1= new Demo1(); new Thread(demo1).start(); new Thread(demo1).start(); new Thread(demo1, "线程3" ).start(); } }

运行输出：

Thread-1:0

Thread-1:1

Thread-1:2

Thread-1:3

Thread-1:4

Thread-1:5

Thread-1:6

Thread-1:7

Thread-1:8

Thread-1:9

线程3:0

线程3:1

线程3:2

线程3:3

线程3:4

线程3:5

线程3:6

线程3:7

线程3:8

线程3:9

Thread-0:0

Thread-0:1

Thread-0:2

Thread-0:3

Thread-0:4

Thread-0:5

Thread-0:6

Thread-0:7

Thread-0:8

Thread-0:9

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package com.java1234.chap09.sec04; public class Demo2  implements Runnable{ @Override public void run() { // TODO Auto-generated method stub for ( int i= ;i< 10 ;i++){ // 获取当前线程 Thread t=Thread.currentThread(); System.out.println(t.getName()+ ":" +i);  // 返回线程的名称 } } public static void main(String[] args) { Demo2 demo2= new Demo2(); Thread t1= new Thread(demo2); System.out.println( "t1是否活动:" +t1.isAlive()); t1.start(); System.out.println( "t1是否活动:" +t1.isAlive()); } }

运行输出：

t1是否活动:false

t1是否活动:true

Thread-0:0

Thread-0:1

Thread-0:2

Thread-0:3

Thread-0:4

Thread-0:5

Thread-0:6

Thread-0:7

Thread-0:8

Thread-0:9

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package com.java1234.chap09.sec04; public class Demo3  implements Runnable{ @Override public void run() { // TODO Auto-generated method stub for ( int i= ;i< 10 ;i++){ try { Thread.sleep( 1000 ); // 获取当前线程 Thread t=Thread.currentThread(); System.out.println(t.getName()+ ":" +i);  // 返回线程的名称 }  catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } public static void main(String[] args) { Demo3 demo1= new Demo3(); new Thread(demo1).start(); } }

Thread-0:0

Thread-0:1

Thread-0:2

Thread-0:3

Thread-0:4

Thread-0:5

Thread-0:6

Thread-0:7

Thread-0:8

Thread-0:9

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package com.java1234.chap09.sec04; public class Demo4  implements Runnable{ @Override public void run() { // TODO Auto-generated method stub for ( int i= ;i< 10 ;i++){ try { Thread.sleep( 1000 ); // 获取当前线程 Thread t=Thread.currentThread(); System.out.println(t.getName()+ ":" +i);  // 返回线程的名称 }  catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } public static void main(String[] args) { Demo4 demo4= new Demo4(); Thread t1= new Thread(demo4, "线程A" ); Thread t2= new Thread(demo4, "线程B" ); Thread t3= new Thread(demo4, "线程C" ); t1.setPriority(Thread.MAX_PRIORITY); t2.setPriority(Thread.MIN_PRIORITY); t3.setPriority(Thread.NORM_PRIORITY); t3.start(); t1.start(); t2.start(); } }

线程C:0

线程A:0

线程B:0

线程A:1

线程C:1

线程B:1

线程A:2

线程B:2

线程C:2

线程A:3

线程C:3

线程B:3

线程A:4

线程C:4

线程B:4

线程A:5

线程B:5

线程C:5

线程A:6

线程C:6

线程B:6

线程A:7

线程C:7

线程B:7

线程A:8

线程C:8

线程B:8

线程A:9

线程C:9

线程B:9

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package com.java1234.chap09.sec04; public class Demo5  implements Runnable{ @SuppressWarnings ( "static-access" ) @Override public void run() { // TODO Auto-generated method stub for ( int i= ;i< 10 ;i++){ try { Thread.sleep( 100 ); // 获取当前线程 Thread t=Thread.currentThread(); System.out.println(t.getName()+ ":" +i);  // 返回线程的名称 if (i== 5 ){ System.out.println( "线程礼让：" ); Thread.currentThread().yield(); } }  catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } public static void main(String[] args) { Demo5 demo1= new Demo5(); new Thread(demo1, "线程A" ).start(); new Thread(demo1, "线程B" ).start(); } }

线程A:0

线程B:0

线程A:1

线程B:1

线程A:2

线程B:2

线程A:3

线程B:3

线程A:4

线程B:4

线程A:5

线程礼让：

线程B:5

线程礼让：

线程A:6

线程B:6

线程A:7

线程B:7

线程A:8

线程B:8

线程A:9

线程B:9