自定义异常（java）：银行用户

package Exception_test2;



public class TestBank1 {
    public static void main(String[] args) throws OverDrawnException, DepositException {
        //定义一个（"001", "张三", "天源路789号", 200）
        Bank1 b = new Bank1("001", "张三", "天源路789号", 200);

        //存入90、-90，取出290
        try {
            b.save(90);
            b.save(-90);
        } catch (DepositException e) {
            System.out.println(e.toString());
        }
        b.take(290);
        System.out.println(b.getNum());
    }
}

//package Exception_test2;

//自定义异常
public class DepositException extends Exception {
    //存款金额不能小于0
    public String toString(){
        return "存款不能为负数";
    }
}

//package Exception_test2;

//自定义异常
public class OverDrawnException extends Exception {
    //账户余额出现负值的异常处理
    public String toString(){
        return "存款不能为负数";
    }
}

//package Exception_test2;

//定义bank类：take（）直接处理异常；save（）抛出异常
public class Bank1 {

    //私有属性
    private String no;
    private String name;
    private String address;
    private double num;

    //取钱
    boolean take(double num) {
        try {
            if (this.num - num < 0) {
                throw new OverDrawnException();
            } else {
                this.num -= num;
            }
        } catch (OverDrawnException e) {
            System.out.println(e.toString());
        }
        return true;
    }

    //存钱
    void save(double num) throws DepositException {
        if (num < 0) {
            throw new DepositException();
        } else {
            this.num += num;
        }
    }

    //构造函数
    Bank1() {
    }

    public Bank1(String no, String name, String address, double num) {
        this.no = no;
        this.name = name;
        this.address = address;
        this.num = num;
    }


    //get与set函数:
    public double getNum() {
        return num;
    }

    public void setNum(double num) {
        this.num = num;
    }

    public String getNo() {
        return no;
    }

    public void setNo(String no) {
        this.no = no;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }
}