Java第4周实验

来源：互联网发布：手机淘宝怎么退货退款编辑：程序博客网时间：2024/06/06 06:53

第4周：多线程与网页下载

1、线程同步程序，P174-176 例8-4

2、多线程的应用，了解利用多线程下载网页数据。

//P174例8-4，银行存取款，实现线程同步。class BankAccount//定义银行账户类 {  private static int amount=2000;//定义存款的方法 public void despoit(int m)  {  amount=amount+m;  System.out.println("小明存入["+m+"元]");  }  public void withdraw(int m)  {  amount=amount-m;  System.out.println("张新取走["+m+"元]");  if(amount<0)  System.out.println("***余额不足！***");  }  public int balance()//定义得到用户余额的方法 {  return amount;  }  }  class Customer extends Thread  {  String name;  BankAccount bs;//定义一个具体的账户对象  public Customer(BankAccount b,String s)  {  name=s;  bs=b;  }  public synchronized static void cus(String name,BankAccount bs)  {  if(name.equals("小明"))//判断用户是不是小明  {  try  {  for(int i=0;i<6;i++)  {  Thread.currentThread();  Thread.sleep((int)(Math.random())*300);  bs.despoit(1000);  }  }  catch(InterruptedException e)  {}  }  else  {  try  {  for(int i=0;i<6;i++)  {  Thread.currentThread();  Thread.sleep((int)(Math.random()*300));  bs.withdraw(1000);  }  }  catch(InterruptedException e)  {}  }  }  public void run()  {  cus(name,bs);  }  }  public class AccountTest {  public static void main(String args[])throws InterruptedException  {  BankAccount bs=new BankAccount();  Customer customer1=new Customer(bs,"小明");  Customer customer2=new Customer(bs,"张新");  Thread t1=new Thread(customer1);  Thread t2=new Thread(customer2);  t1.start();  t2.start();  Thread.currentThread();  Thread.sleep(500);  }  }

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