线程状态
线程停止
package com.zishi.lesson3;
?
//测试stop
//1.建议线程正常停止--》利用次数,不建议死循环
//2.简易使用标志位-->设置一个标志位
//3.不要使用stop 或者 destroy 等过时或者JDK不建议使用的方法
public class TestStop implements Runnable{
?
//1.设置一个标识位
private boolean flag = true;
?
通过主线程停止子线程?
线程休眠
package com.zishi.lesson3;
?
import com.zishi.lensson1.TestThread4;
?
//模拟网络延时:放大问题的发生性
public class TestSleep implements Runnable{
//票数
private int ticketNums = 10;
?
?
package com.zishi.lesson3;
?
import java.text.SimpleDateFormat;
import java.util.Date;
?
//模拟倒计时
public class TestSleep2 {
?
public static void main(String[] args) {
// try {
// timeDown();
// } catch (InterruptedException e) {
// e.printStackTrace();
// }
//每秒获取一次系统时间
?
Date date = new Date(System.currentTimeMillis());//获取当前系统时间
?
while (true){
try {
Thread.sleep(1000);
System.out.println(new SimpleDateFormat("HH:mm:ss").format(date));
date = new Date(System.currentTimeMillis());//更新当前时间
} catch (InterruptedException e) {
e.printStackTrace();
}
}
?
}
?
//模拟倒计时
public static void timeDown() throws InterruptedException {
int num = 10;
while(true){
Thread.sleep(1000);
System.out.println(num--);
if (num<=0){
break;
}
}
}
}
线程礼让
package com.zishi.lesson3;
?
//礼让线程
//礼让不一定成功,看CPU心情
public class TestYield {
public static void main(String[] args) {
MyYielf myYielf = new MyYielf();
?
new Thread(myYielf,"a").start();
new Thread(myYielf,"b").start();
}
}
?
class MyYielf implements Runnable{
这个例子有点问题。。。ab线程都会礼让,不能确定谁先执行,
线程Join 插队
package com.zishi.lesson3;
?
//测试Join方法 插队
public class TestJoin implements Runnable {
线程状态观测
package com.zishi.lesson3;
?
//观察测试线程的状态
public class TestState {
public static void main(String[] args) throws InterruptedException{
Thread thread = new Thread(()->{ //lembda
for (int i = 0; i < 5; i++) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
System.out.println("///////");
});
?
//观察状态
Thread.State state = thread.getState();
System.out.println(state); //NEW
?
//观察启动后的线程状态
thread.start(); //启动线程
state = thread.getState(); //更新
System.out.println(state); //RUN
?
while (state != Thread.State.TERMINATED){
Thread.sleep(100);
state = thread.getState();
System.out.println(state);
}
}
}
线程优先级
package com.zishi.lesson3;
?
//测试线程的优先级
public class TestPriority {
public static void main(String[] args) {
//主线程默认优先级
System.out.println(Thread.currentThread().getName()+"-->"+Thread.currentThread().getPriority());
?
MyPriority myPriority = new MyPriority();
?
Thread t1 = new Thread(myPriority);
Thread t2 = new Thread(myPriority);
Thread t3 = new Thread(myPriority);
Thread t4 = new Thread(myPriority);
Thread t5 = new Thread(myPriority);
Thread t6 = new Thread(myPriority);
?
//设置优先级再启动
t1.setPriority(1);
t1.start();
?
t2.setPriority(5);
t2.start();
?
t3.setPriority(6);
t3.start();
?
t4.setPriority(8);
t4.start();
?
t5.setPriority(Thread.MAX_PRIORITY);//MAX_PRIORITY=10
t5.start();
?
t6.setPriority(3);
t6.start();
}
}
?
class MyPriority implements Runnable{