怎么让某个类不能使用某个方法？
创建一个银行账户Account 类，有存款，取款等方法，在创建两个子类，其中有一个是SavingAccount，SavingAccount不能透支，所以能否使SavingAccount不访问取款方法？
代码如下（没写完）：
package pkg;
public class test9_3 {
public void main(String[] args)
{
//SavingAcc saving = new SavingAcc();
}
public class Account
{
int accountNum= 0;
private double balance = 0;//yu e
private double yearInterest = 0;
private String openDate = null ;
Account(int accountNum , double balance , double yearInterest ,String openDate)
{
this.accountNum = accountNum;
this.balance = balance ;
this.yearInterest = yearInterest ;
this.openDate = openDate ;
System.out.print("this is Account class");
}
//Account(){}
public double getBanlance()
{
return balance;
}
public void deposit(double depositMoney)
{
balance += depositMoney ;
}
public void drawMoney(double DMoney)
{
balance -=DMoney;
}
}
}
package pkg;
import pkg.test9_3.Account;
public class SavingAcc extends Account {
SavingAcc(test9_3 test9_3, int accountNum, double balance,double yearInterest, String openDate) {
test9_3.super(accountNum, balance, yearInterest, openDate);
// TODO Auto-generated constructor stub
if(this.getBanlance() < 0)
{
System.out.println("your Account's balance is lower than $0");
}
else
;
}
}
[解决办法]
SavingAccount 的 drawMoney 抛出 UnsupportedOperationException
[解决办法]
