java-08多态与异常处理

public class ParentChildTest {
    public static void main(String[] args) {
        Parent parent=new Parent();
        parent.printValue();
        Child child=new Child();
        child.printValue();
        
        parent=child;
        parent.printValue();
        
        parent.myValue++;
        parent.printValue();
        
        ((Child)parent).myValue++;
        parent.printValue();
        
    }
}

class Parent{
    public int myValue=100;
    public void printValue() {
        System.out.println("Parent.printValue(),myValue="+myValue);
    }
}
class Child extends Parent{
    public int myValue=200;
    public void printValue() {
        System.out.println("Child.printValue(),myValue="+myValue);
    }
}

import java.util.Scanner;

class Account{
    String account;
    String name;
    String date;
    int key;
    double money;
    
    public Account(String a,String b,String c,int d,double e)
    {
        account=a;
        name=b;
        date=c;
        key=d;
        money=e;
    }
    
}

public class Option {
    public static void main(String[] args) {
        Account aa=new Account("622888040311","zxw","2016.11.15",123456,1000);
        int a,b;
        System.out.println("请选择语言：1.中文 2.英文");
        Scanner in =new Scanner(System.in);
        a=in.nextInt();
        System.out.println("请输入密码：");
        Scanner in1 =new Scanner(System.in);
        b=in1.nextInt();
        if(b==aa.key){
            while(true){
                
            int choose;
            System.out.println("请选择操作：1.存款 2.取款 3.转账汇款 4.修改密码 5.查询余额");
            Scanner in2 =new Scanner(System.in);
            choose=in2.nextInt();
            if(choose==1){
                System.out.println("请输入存款金额：");
                Scanner in3 =new Scanner(System.in);
                double cun=in3.nextInt();
                aa.money=aa.money+cun;
                continue;
            }
            else if(choose==2){
                System.out.println("请输入取款金额：");
                Scanner in4=new Scanner(System.in);
                double qu=in4.nextDouble();
                if(aa.money<qu){
                    System.out.println("卡内余额不足");
                }
                aa.money=aa.money-qu;
                continue;
            }
            else if(choose==3){
                System.out.println("请输入要转账的卡号：");
                Scanner in6=new Scanner(System.in);
                String hang=in6.nextLine();
                if(hang.equals(aa.account)){
                    System.out.println("请输入转账金额：");
                    Scanner in5=new Scanner(System.in);
                    double zhuan=in5.nextDouble();
                    aa.money=aa.money-zhuan;
                }
            }
            else if(choose==4){
                System.out.println("请输入原密码：");
                Scanner in7=new Scanner(System.in);
                int mi=in7.nextInt();
                if(mi==aa.key){
                    System.out.println("请输入新密码：");
                    Scanner in8=new Scanner(System.in);
                    int mi2=in8.nextInt();
                    aa.key=mi2;
                }
            }
            else if(choose==5){
                System.out.println("现在的余额为："+aa.money);
            }
            
            }
        }
        else
            System.out.println("密码错误，该卡已被锁定，无法操作");

    }

}