求助！java 一道题，帮忙修改一下！

这个程序包含两个类，第一个类Account，用来定义一个银行账号基本属性和操作，第二个类AccountDemo用来创建Account的对象，并通过这些对象进行模拟存款，取款，查询账号信息等操作

Account类包括姓名（name），账号（caaNum）余额（balance）3个属性，4个方法：Account（）构造方法用来对属性进行设置初始值，withdraw（）方法用来向指定帐户取款，deposit（）方法用来向指定帐户存款。一个显示账号信息的display（）方法。

总的来说，其实就是为某个人开个帐户的意思。。。老师说要用到类的继承

在参考别人的帮助下和自己的胡写。。凑出了下面这团东西。。。

期待可以有人指点一下~错误肯定很多。。。

public class Account
{
String name;
int accNum;
double balance;
public Account(String name,int accNum,double balance)
{
name=name;
accNum=accNum;
balance=balance;
}
public boolean withdraw (double money)
{
balance=balance-money;
return true;
}
public boolean desposit(double money)
{
balance=balance+money;
return true;
}
public boolean display()
{
System.out.println("姓名是"+name);
System.out.println("余额是"+balance);
System.out.println("账号是"+accNum);
return true;
}
}
class AccountDemo extends Account{

AccountDemo()
{
super.Account(Tom,1,400);
one.withdraw(100);
one.desposit(200);
one.display();
}
public static void main(String[]args){
Account one=new Account(Tom,1,400);
one.AccountDemo();
}
}

public class Account {
String name;
int accNum;
double balance;

public Account(){}
public Account(String name,int accNum,double balance)
{
this.name=name;
this.accNum=accNum;
this.balance=balance;
}

public boolean withdraw (double money)
{
balance=balance-money;
return true;
}

public boolean desposit(double money)
{
balance=balance+money;
return true;
}

public boolean display()
{
System.out.println("姓名是"+name);
System.out.println("余额是"+balance);
System.out.println("账号是"+accNum);
return true;
}
}

public class AccountDemo extends Account{
public AccountDemo(String name, int accNum, double balance){
super(name,accNum,balance);
super.withdraw(100);
desposit(200);
display();
}
public static void main(String[]args){
Account one=new AccountDemo("Tom",1,400);
}
}

已经改好，编译通过，运行正确： class Account { String name; int accNum; double balance; public Account(String name,int accNum,double balance) { this.name=name; this.accNum=accNum; this.balance=balance; } public boolean withdraw (double money) { balance=balance-money; return true; } public boolean desposit(double money) { balance=balance+money; return true; } public boolean display() { System.out.println("姓名是"+name); System.out.println("余额是"+balance); System.out.println("账号是"+accNum); return true; } } public class AccountDemo extends Account{ AccountDemo(String s, int id, double b) { super(s,id,b); } void Demo(){ withdraw(100); desposit(200); display(); } public static void main(String[]args){ AccountDemo one=new AccountDemo("Tom",1,400); one.Demo(); } }