背景说明:
所遇到的问题1:
问题描述:
解决步骤1:
解决步骤2:
最后:
代码:
主程序java代码:javaThreadTest
package org.axc.com.javathread;
import java.util.Scanner;
/**
*
* @ClassName: javaThreadTest
* @Description: 测试java线程的运行
* @author Anxc
* @date 2019年8月8日
*
*/
public class JavaThreadTest {
public static void main(String[] args) {
// 线程的创建
MyThread mythread;
System.out.println("---------继承Thread方式来实现创建线程-----------------");
Scanner in = new Scanner(System.in);
String menu="线程测试开始";
int chioce=1;
while(chioce!=0) {
mythread = new MyThread();
System.out.println("请输入非0来开始调试继承的Thread");
System.out.print(">>");
chioce = in.nextInt();
if(chioce==0) {
System.out.println("ByeBye");
break;
}
// 输出菜单
System.out.println(menu);
// 线程运行
mythread.start();
}
System.out.println("------------利用Runnable接口实现创建线程-------------");
// 测试Runnable的多线程所用时间
chioce = 1;
// 利用Runnable接口,初始化线程
Runnable runnable = new MyRunnable();
long startTime;
long endTime;
while(chioce!=0) {
System.out.println("请输入非0来开始调试");
System.out.print(">>");
chioce = in.nextInt();
if(chioce == 0) {
System.out.println("Runnable ByeBye!");
break;
}
startTime = System.currentTimeMillis();
System.out.println(startTime);
// 创建10个线程来观察是否是真的多线程运行
new Thread(runnable).start();
new Thread(runnable).start();
new Thread(runnable).start();
new Thread(runnable).start();
new Thread(runnable).start();
new Thread(runnable).start();
new Thread(runnable).start();
new Thread(runnable).start();
new Thread(runnable).start();
new Thread(runnable).start();
Thread t=new Thread(runnable);
//t.isAlive();//判断线程是否存活
try {
Thread.sleep(8000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// 输出最后所用时间
System.out.println("最终所用时间为:"+(((MyRunnable) runnable).getEndTime()-startTime));
}
}
}
实现接口Runnable的java程序代码:MyRunnable
package org.axc.com.javathread;
/**
*
* @ClassName: MyRunnable
* @Description: 测试Runnable的真正多线程
* @author Anxc
* @date 2019年8月8日
*
*/
public class MyRunnable implements Runnable {
private static int count=100; //加互斥锁,当一个线程去修改值时,其它线程不能读取
public static long endTime;
private static boolean flag=true;
public MyRunnable() {
}
@Override
public void run() {
int num=10;
// 加锁,使修改变量时只有一个线程在操作
while(num>0) {
if(flag) {
flag=false;//加锁
count--;
// TODO Auto-generated method stub
System.out.println("当前剩余"+count);
flag=true;//关锁
}
else {
try {
Thread.sleep(10);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
continue;
}
try {
Thread.sleep(500);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
num--;
}
// 获取线程运行终止时间
endTime = System.currentTimeMillis();
// System.out.println(endTime);
}
public long getEndTime() {
return endTime;
}
}
继承Thread的方法的java程序:MyThread
package org.axc.com.javathread;
/**
*
* @ClassName: MyThread
* @Description: java线程的实现方式之一继承Thread
* @author Anxc
* @date 2019年8月8日
*
*/
public class MyThread extends Thread {
private static int count = 0;
public void run() {
int num=0;
count++;
while(num<5) {
System.out.println("再等等!"+count+num);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
num++;
}
System.out.println("当前已经累计运行该线程:"+count+"次");
}
}