学习笔记（二）多线程

多线程机制

多线程是指同时存在几个执行体，按照几条不同的执行线索共同工作的情况，使编程人员很方便的开发出具有多线程功能，能同时处理多个任务的功能强大的应用程序。

实现多线程的方式

一、继承Thread类

public class People extends Thread {

int timeLength;

Csum sum;

People(String s,int timeLength,Csum sum){

setName(s);

this.timeLength=timeLength;

this.sum=sum;

}

public void run(){

for (int i=1;i<=5;i++){

int m=sum.getSum();

sum.setSum(m+1);

System.out.println("我是"+getName()+",现在的和："+sum.getSum());

try {

sleep (timeLength);

}catch(InterruptedException e){}

}

}

}

public class Csum {

int sum;

public int getSum() {

return sum;

}

public void setSum(int sum) {

this.sum = sum;

}

}

public class ThreadTest {

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

Csum sum = new Csum();

People teacher = new People("老师",200,sum);

People student = new People("学生",200,sum);

teacher.start();

student.start();

}

}

二、实现Runnable接口

public class ThreadTest2 implements Runnable {

private int money = 0;

Thread account,casher;

ThreadTest2(){

account=new Thread(this);

account.setName("account");

casher=new Thread(this);

casher.setName("casher");

}

@Override

public void run() {

// TODO Auto-generated method stub

while (true){

money =money-50;

if(Thread.currentThread()==account){

System.out.println("我是"+account.getName()+",现在有："+money);

if(money<150){

System.out.println(account.getName()+"进入死亡状态");

return;

}

}

else if(Thread.currentThread()==casher){

System.out.println("我是"+casher.getName()+",现在有："+money);

if(money<150){

System.out.println(casher.getName()+"进入死亡状态");

return;

}

}

try {

Thread.sleep (800);

}catch(InterruptedException e){}

}

}

public int getMoney() {

return money;

}

public void setMoney(int money) {

this.money = money;

}

}

public class Bank {

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

ThreadTest2 test = new ThreadTest2();

test.setMoney(300);

test.account.start();

test.casher.start();

}

}