java编程多线程并发处理实例解析

package cn.edu.byr.test;
public class Account {
	private String accountNo;
	private double balance;
	public Account(){
	}
	public Account(String accountNo,double balance){
		this.accountNo = accountNo;
		this.balance = balance;
	}
	public int hashcode(){
		return accountNo.hashCode();
	}
	public String getAccountNo(){
		return this.accountNo;
	}
	public double getBalance(){
		return this.balance;
	}
	public void setBalance(double balance){
		this.balance = balance;
	}
	public Boolean equals(Object obj){
		if(this == obj) 
		      return true;
		if(obj != null && obj.getClass() == Account.class){
			Account target = (Account)obj;
			return target.getAccountNo().equals(accountNo);
		}
		return false;
	}
}

package cn.edu.byr.test;
public class DrawThread extends Thread {
	private Account account;
	private double drawAmount;
	public DrawThread(String name,Account account,double drawAmount){
		super(name);
		this.account = account;
		this.drawAmount = drawAmount;
	}
	public void run(){
		//   synchronized (account) { 
		if(account.getBalance() > drawAmount){
			System.out.println(getName() + "取钱成功，吐出钞票：" + drawAmount);
			//       try{ 
			//         Thread.sleep(1); 
			//       } 
			//       catch(InterruptedException e){ 
			//         e.printStackTrace(); 
			//       } 
			account.setBalance(account.getBalance() - drawAmount);
			System.out.println("\t 余额为 ： " + account.getBalance());
		} else 
		        System.out.println(getName() + "取钱失败，余额不足！");
		//   }
	}
	public static void main(String[] args){
		Account acct = new Account("123456",1000);
		new DrawThread("A",acct,800).start();
		new DrawThread("B",acct,800).start();
	}
}