2015.11.1

线程关键字：synchronized;作用：同步锁，使得线程有先后顺序。

 

public class Test {
   public static void main(String[] args){
	   Account account = new Account(1000);
	   
      OperationThread oper1 = new OperationThread(account,500,"柜台");
      OperationThread oper2 = new OperationThread(account,600,"ATM");
      oper1.start();
      oper2.start();
   }
}

public class  Account {

	private int count;
	public Account(int count){
		this.count = count;
	}
	public int getCount(){
		return count;
	}
	public synchronized int getCash(int cash){
		if(cash>count){
			return -1;
		}else if(cash

public class OperationThread extends Thread{
   private  Account account;
   private int cash;
   private String OperationType;
   public OperationThread(Account account,int cash,String OperationType){
	   this.account=account;
	   this.cash=cash;
	   this.OperationType=OperationType;
   }
   public void run(){
	   super.run();
	   int result = account.getCash(cash);
	   if(result==-1){
		   System.out.println(OperationType+"取现失败，账户余额为："+account.getCount()+",准备取现的额度为："+cash);
		}else{
			System.out.println(OperationType+"取现成功，账户余额为："+account.getCount()+",准备取现的额度为："+cash);
	   }
   }
}

输出的结果：

ATM取现失败，账户余额为：500,准备取现的额度为：600
柜台取现成功，账户余额为：500,准备取现的额度为：500

线程池；多个线程的存在，但是过多的线程严重消耗cpu，因此，

线程池里的每个线程需要重复利用，意味着建立线程池：

 

public static void main(String[] args) {
	
		ThreadPool pool = new ThreadPool();
		
		for(int i=0;i<60;i++){
			MyTask task = new MyTask(i);
			pool.excute(task);
		}

run方法：

public void run() {
		while(true){
			//同步关键字
			synchronized (taskList) {
				if(taskList.isEmpty()){
					try {
						taskList.wait();
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
			}
			//取出一个任务，并执行
			MyTask task = taskList.remove(0);
			System.out.println(this.getName()+"开始执行"+task.index+"任务");
			task.work();
		}
	}