h2j异常处理综合练习答案

最新推荐文章于 2025-12-19 15:39:34 发布

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本文介绍了如何在Java中实现银行账户类，包括基本的账户操作如存款和取款，以及处理透支情况的OverDraftException异常。通过CheckingAccount子类演示了透支保护功能。

package exception;

public class Account {

protected double balance;

public Account(double balance) {
this.balance = balance;
}

public double getBalance() {
return balance;
}

public void deposit(double amt){
this.balance+=amt;
}
public void withdraw(double amt) throws OverDraftException{
if(this.balance<amt)
throw new OverDraftException("余额不足", amt-this.balance);

this.balance-=amt;
}

public static void main(String[] args) {
//开户存了1000
Account a = new Account(1000);
//存钱1000
a.deposit(1000);
//查看余额
System.out.println(a.getBalance());

try {
//取2001
a.withdraw(2001);
} catch (OverDraftException e) {
System.err.println("透支金额："+e.getDeficit());
e.printStackTrace();
}

}

}

package exception;

public class OverDraftException extends Exception{

private double deficit;

public double getDeficit() {
return deficit;
}

public OverDraftException(String msg, double deficit) {
super(msg);
this.deficit = deficit;
}

}

package exception;

public class CheckingAccount extends Account {

private double overdraftProtection;

public CheckingAccount(double balance) {
super(balance);
}

public CheckingAccount(double balance, double overdraftProtection) {
super(balance);

this.overdraftProtection = overdraftProtection;
}

public void withdraw(double amt) throws OverDraftException {
if (amt > this.balance + overdraftProtection) {
double deficit = amt - (this.balance + overdraftProtection);
throw new OverDraftException("透支额度超标", deficit);
}
this.balance -= amt;
}

public static void main(String[] args) {
//开户存了1000块，拥有500的透支额度
CheckingAccount a = new CheckingAccount(1000, 500);
//存了1000
a.deposit(1000);
//查询余额
System.out.println(a.getBalance());
try {
a.withdraw(600);
System.out.println(a.getBalance());
a.withdraw(600);
System.out.println(a.getBalance());
a.withdraw(600);
System.out.println(a.getBalance());
a.withdraw(600);
System.out.println(a.getBalance());
a.withdraw(600);
System.out.println(a.getBalance());
} catch (OverDraftException e) {
System.err.println("透支超额:"+e.getDeficit());
e.printStackTrace();
}

}

}