多线程4-线程状态与常用方法

线程的状态

1.线程也有固定的操作状态

1. 创建状态：准备好了一个多线程的对象
2. 就绪状态：调用了start()方法，等待CPU进行调度
3. 运行状态：执行run()方法
4. 阻塞状态：暂时停止执行，可能将资源交给其他线程使用
5. 终止状态：（死亡状态）线程销毁
   （阻塞可以恢复为运行状态）

线程的常用方法

1.取得线程名称
getName()

2.取得当前线程对象
currentThread()

3.判断线程是否启动
isAlive()

4.线程的强行运行
join()

5.线程的休眠
sleep()

6.线程的礼让
yield()

//先获得线程对象才能获得线程名称
public class RunDemo implements Runnable{
private String name;
public RunDemo(String name){
this.name=name;
    }

public void run(){
for(int i=0;i<50;i++){
            System.out.println("当前线程对象："+Thread.currentThread().getName());
        }
    }
}

public class DemoTest{
public static void main(String[] args){
        RunDemo r1=new RunDemo("A");
        RunDemo r2=new RunDemo("B");
        Thread t1=new Thread(r1);
        Thread t2=new Thread(r2);
        r1.start();
        r2.start();
    }
}

//当前线程是否在启动
public class RunDemo implements Runnable{
private String name;
public RunDemo(String name){
this.name=name;
    }

public void run(){
for(int i=0;i<50;i++){
            System.out.println(name+":"+i);
        }
    }
}

public class DemoTest{
public static void main(String[] args){
        RunDemo r1=new RunDemo("A");
        Thread t1=new Thread(r1);
        System.out.println(t1.isAlive());
        t1.start();
        System.out.println(t1.isAlive());
    }
}

//线程强行运行
public class RunDemo implements Runnable{
private String name;
public RunDemo(String name){
this.name=name;
    }

public void run(){
for(int i=0;i<50;i++){
            System.out.println(name+":"+i);
        }
    }
}

public class DemoTest{
public static void main(String[] args){
        RunDemo r=new RunDemo("A");
        Thread t=new Thread(r);
        t.start();
for(int i=0;i<50;i++){
if(i>10){
try{
                    t.join();
                }catch(InterruptedException e){
                    e.printStackTrace();
                }
            }
            System.out.println("主线程："+i);
        }
    }
}

//线程的沉睡
public class RunDemo implements Runnable{
private String name;
public RunDemo(String name){
this.name=name;
    }

public void run(){
for(int i=0;i<50;i++){
try{
                Thread.sleep(1000);
                System.out.println(name+":"+i);
            }catch(InterruptedException e){
                e.printStackTrace();
            }
        }
    }
}

//线程的礼让
public class RunDemo implements Runnable{
private String name;
public RunDemo(String name){
this.name=name;
    }

public void run(){
for(int i=0;i<50;i++){
            System.out.println(name+":"+i);
if(i == 10){
                System.out.println("礼让");
                Thread.yield();
            }
        }
    }
}

public class DemoTest{
public static void main(String[] args){
        RunDemo r1=new RunDemo("A");
        RunDemo r2=new RunDemo("B");
        Thread t1=new Thread(r1);
        Thread t2=new Thread(r2);
        t1.start();
        t2.start();
    }
}