Java多线程-线程常用方法

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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：

package com.java1234.chap09.sec04;
 
public class Demo1 implements Runnable{
 
    @Override
    public void run() {
        // TODO Auto-generated method stub
        for(int i=0;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

package com.java1234.chap09.sec04;
 
public class Demo2 implements Runnable{
 
    @Override
    public void run() {
        // TODO Auto-generated method stub
        for(int i=0;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

package com.java1234.chap09.sec04;
 
public class Demo3 implements Runnable{
 
    @Override
    public void run() {
        // TODO Auto-generated method stub
        for(int i=0;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

package com.java1234.chap09.sec04;
 
public class Demo4 implements Runnable{
 
    @Override
    public void run() {
        // TODO Auto-generated method stub
        for(int i=0;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

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=0;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

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