多线程的问题
第一个是总是出现要输入参数，但那时程序已经结束了
第二个是不像预先想像的那样，两个线程同时的进行，来显示在文本框中
第一个程序
import java.io.*;
public class TestThread
{
public static void main(String args[])
{
if(args.length < 1)
{
System.out.println( "please enter a cmd parameter : ");
System.exit(0);
}
MyThread myThread = new MyThread(Integer.parseInt(args[0]));
myThread.start();
while(myThread.isAlive() && myThread.readyToGoOn())
{
System.out.println( "Counting the number.... ");//so the main thread is running
try
{
Thread.sleep(500);
}
catch(InterruptedException e)
{
return;
}//End of catch
}//End of while
System.out.println( "按任意键继续.... ");
try
{
System.in.read();
}
catch(IOException e){}
}
}
//create the user 's thread class
class MyThread extends Thread
{
boolean m_bContinue = true;//mark the end of the thread
int m_nCircleNum;//the upmost of circle
MyThread (int Num)//construction function
{
this.m_nCircleNum = Num;
}
boolean readyToGoOn()//check the thread is to run
{
return m_bContinue;
}
public void run()//override the run function of the baseclass
{
int number = 3;
boolean flag = true;
while(true)
{
int i;
for(i = 2;i < number;i++)
if(number % i == 0)
flag = false;
if(flag)
System.out.println(number + "是素数 ");
else
System.out.println(number + "不是素数 ");
number ++;
if(number > m_nCircleNum)
{
m_bContinue = false;
}
flag = true;
try
{
Thread.sleep(500);
}
catch(InterruptedException e)
{
return;
}//End of catch
}//End of while
}//End of run
}//End of class
、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、、
第二个程序
import java.applet.Applet;
import java.awt.*;
public class TestRunnable extends Applet implements Runnable
{
Label prompt1 = new Label( "第一个子线程 ");
Label prompt2 = new Label( "第二个子线程 ");
TextField threadFirst = new TextField(20);
TextField threadSecond = new TextField(20);
Thread thread1,thread2;
int count1 = 0,count2 = 0;
public void init()
{
add(prompt1);
add(threadFirst);
add(prompt2);
add(threadSecond);
}
public void start()
{
thread1 = new Thread(this, "First Thread ");
thread2 = new Thread(this, "Second Thread ");
thread1.start();
thread2.start();
}
public void run()
{
String currentRunning;
while(true)
{
try
{
Thread.sleep((int)(Math.random() * 30000));
}
catch(InterruptedException e){}
currentRunning = Thread.currentThread().getName();
if(currentRunning.equals( "FirstThread "))
{
count1++;
threadFirst.setText( "线程1第 " + count1 + "次被调度 ");
}
else if(currentRunning.equals( "SecondThread "))
{
count2++;
threadSecond.setText( "线程2第 " + count2 + "次被调度 ");
}
}//End of while
}//End of run
}
[解决办法]
第一个程序
1. 运用的时候输入参数. 比如:java TestThread 10
2. while(true)改成while (m_bContinue)....
3. System.out.println( "Counting the number.... ")扔到run方法里好点吧...
第二个程序
1. thread1 = new Thread(this, "First Thread ");
thread2 = new Thread(this, "Second Thread ");
把 "First Thread "和 "Second Thread "中的空格去掉....
2. 把30000改小点更容易看到结果...
[解决办法]
i agree
