Question

java多线程应用

创建一个程序，利用多线程模拟银行的排号器的工作过程，即利用多个线程模拟客户到排号器上取号的过程。
提示：设计一个类用于产生号码，设计多个线程模拟用户得到号码。要采用两种办法实现。
提前谢谢回答者！

Answer 1

import java.lang.Thread;
import java.util.*;
class Test extends Thread{
static NumberMachine machine=new NumberMachine();
public void run(){

int x=0;
try{

for(;;){
x=(int)(Math.random()*5000);
sleep(x);
System.out.println("打印出第"+machine.printNumber()+"张号码");

}
}catch(Exception e){
e.printStackTrace();
System.out.println("消息:"+e.getMessage());
}
}
public static void main(String[] str){

Test t=new Test();
int x=0;
t.start();
try{
sleep(1000);
for(;;){
x=(int)(Math.random()*2000);
sleep(x);
if(machine.getMax()<=machine.getMin()) System.out.println("暂时没有客户来办理业务");
else System.out.println(machine.finish()+"号顾客办理结束");

}
}catch(Exception e){
e.printStackTrace();
System.out.println("消息:"+e.getMessage());
}

}
}
class NumberMachine{
static List<Integer> list=new ArrayList<Integer>();
private int numberMax=1;
private int numberMin=1;

public int printNumber(){
list.add(Integer.valueOf(numberMax++));
return numberMax-1;
}

public int finish(){
list.remove(Integer.valueOf(numberMin));
numberMin++;
return numberMin-1;
}
public int getMax(){
return numberMax;
}
public int getMin(){
return numberMin;
}
}

运行就知道什么意思

Answer 2

public class GetNum implements Runnable {

static int num = 0;
String name = "";
public GetNum(String name){
this.name = name;
}
public synchronized void run(){
while(true){
getNum();
System.out.println(name + "取出" + num + "号");
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

public void getNum()
{
num ++;
}

public static void main(String[] args){
new Thread(new GetNum("1号机")).start();
new Thread(new GetNum("2号机")).start();
new Thread(new GetNum("3号机")).start();
new Thread(new GetNum("4号机")).start();
}
}