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78 lines (60 loc) · 1.63 KB
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package chapter8;
public class CashCard {
private String number;
private int balance;
private int bonus;
public CashCard(String number, int balance, int bonus) {
this.number = number;
this.balance = balance;
this.bonus = bonus;
}
public String getNumber() {
return number;
}
public void setNumber(String number) {
this.number = number;
}
public int getBalance() {
return balance;
}
public void setBalance(int balance) {
this.balance = balance;
}
public int getBonus() {
return bonus;
}
public void setBonus(int bonus) {
this.bonus = bonus;
}
public void store(int money) {
assert money >= 0 : "不能存负数";
if (money > 0) {
this.balance += money;
if (money >= 100) {
this.bonus++;
}
} else {
throw new IllegalArgumentException();
}
}
public void charge(int money) throws InsufficientException {
assert money >= 0 : "不能取负数";
if (money > 0) {
if (money <= this.balance) {
this.balance -= money;
} else {
throw new InsufficientException("余额不足", this.balance);
}
} else {
throw new IllegalArgumentException();
}
}
public int exchange(int bonus) throws InsufficientException {
if (bonus > 0) {
this.bonus = bonus;
} else {
throw new InsufficientException("点数不足", bonus);
}
return this.bonus;
}
}