异常3

建立Bank类，类中有变量double balance表示存款,Bank类的构造方法能初始化余额，Bank类中有存款的方法cunKuan(double  balance)，取款的发方法withDrawal(double dAmount),当取款的数额大于存款时,抛出InsufficientFundsException,取款数额为负数，抛出NagativeFundsException,当用方法withdrawal(150)，withdrawal(-15)时会抛出自定义异常。

public class Bank {
    double yu_e;
    double balance;

    Bank(double yu_e) {
        this.yu_e = yu_e;
        System.out.println("账户内余额："+this.yu_e+"元");
    }

    void cunKuan(double balance) throws Exception {
        if(balance<0){
            throw new Exception("存款不能为负");
        }
        yu_e += balance;
    }

    void withDrawal(double dAmount) throws Exception {
        if(dAmount>yu_e){
            throw new Exception("InsufficientFundsException，余额不足");
        }else if (dAmount<0){
            throw new Exception("NagativeFundsException,取款值为负");
        }
        yu_e -= dAmount;
    }

    public static void main(String[] args) {

        Bank b = new Bank(10);
        try {
            b.cunKuan(-100);
        } catch (Exception e) {
            e.printStackTrace();
        }  
        
        try {
            b.withDrawal(150);
        } catch (Exception e) {
            e.printStackTrace();
        }
        
        try {
            b.withDrawal(-15);
        } catch (Exception e) {
            e.printStackTrace();
        }

        System.out.println("存款余额"+b.yu_e+"元");

    }

}

运行：