package ltb6w;
import java.util.*;
public class Bank {
private boolean bool=true;
private String select;
private String select2;
private double balance=0.0; //余额
private double inputbalance=0.0;
private Scanner sc=new Scanner(System.in);
public Bank() {
System.out.println("请输入存款额度:");
}
@SuppressWarnings("serial")
class NotSufficientFunds extends Exception { //自定义异常类
private String insufficient;
NotSufficientFunds(String s ) {
insufficient=s;
}
public String getMessage() {
return insufficient;
}
}
public void deposite() throws Exception{//存款操作
try {
inputbalance=sc.nextInt();// 容易出异常的地方
}catch (InputMismatchException e) {
System.out.println("请输入数字:");
this.bool=false;
}
if(inputbalance<0) {
throw new NotSufficientFunds("存款不能是负数"); //抛出自定义异常
}
this.balance=inputbalance+balance;
System.out.println("存款总额:"+balance);
}
public void withdrawa() throws Exception{//取款操作
System.out.println("请输入取款数:");
this.balance=balance-sc.nextInt();
if (balance<0) { //激发异常类
throw new NotSufficientFunds("余额已经是负数了");
}
System.out.println("余额:"+this.getbalawal());
}
public double getbalawal() { //获取余额操作
return balance;
}
public void getBank() {
System.out.println("是否继续存款：是or否");
select=sc.next(); // 容易出异常的地方
if("否".equals(select)) {
while (true) {
System.out.println("看仔细了！！！是否还继续取款：是or否");
try {
select2=sc.next(); // 容易出异常的地方
}catch (InputMismatchException e) {
System.out.println("不要输入(是or否)之外无关的数据，从来，再来。"+e.getMessage());
}
if("是".equals(select2)) {
try {
withdrawa();
break;
} catch (Exception e) {
e.printStackTrace();
}
}else if ("否".equals(select2)){
System.out.println("不管你选不选否都当做退出。["+select2+"]");
break;
}
}
bool=false;
System.out.println("已经成功退出");
}else if("是".equals(select)) {
System.out.println("继续输入金额，come on baby!");
}
}
public static void main(String[] args) throws Exception {
Bank b=new Bank();
while (b.bool) {
b.deposite();
b.getBank();
}
}
}
【优化】自定义抛出throw 对象练习的相关教程结束。
