第四周作业

BankAccount.java

class BankAccount                  //定义银行账户类BankAccount

{

private static int amount=2000; //账户余额最初为2000

public void despoit(int m)     //定义存款的方法

{

amount = amount + m;

System.out.println("小明存入【"+ m +"元】");

}

public void withdraw(int m)     //定义取款的方法

{

 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()          //定义得到账户余额的方法

{

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().sleep((int)(Math.random()*300));

bs.despoit(1000);

}

}

catch(InterruptedException e)

{}

}

else

{

try

{

for(int i=0;i<6;i++)

{

Thread.currentThread().sleep((int)(Math.random()*300));

bs.withdraw(1000);

}

}

catch(InterruptedException e)

{}

}

}

public void run()             //定义run方法

{

cus(name,bs);

}

}

public class AccountTest1

{

public static void main(String arges[])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().sleep(500);

}

}

FontSet.java

import java.awt.*;

import java.awt.font.*;

import javax.swing.*;

public class FontSet

{

public static void main(String args[])

{

FontFrame frame= new FontFrame();

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.show();

}

}

class FontFrame extends JFrame

{

public FontFrame()

{

setTitle("设置字体");

setSize(WIDTH,HEIGHT);

FontPanel panel=new FontPanel();//将panel加入到Frame

Container contentPane=getContentPane();

contentPane.add(panel);

}

public static final int WIDTH=300;

public static final int HEIGHT=140;

}

class FontPanel extends JPanel

{

public void paintComponet(Graphics g)

{

super.paintComponent(g);

//设置字体

Font f=new Font("宋体",Font.BOLD+ Font.ITALIC,20);

g.setFont(f);

//设置文本

g.drawString("Java欢迎您！",x,y);

}

public int x=55;

public int y=50;

}

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