Python 官方文档:入门教程 => 点击学习
目录老韩思路:一些说明SmallChangeSys 用来写main方法代码如下具体说明各个方法的作用:public void menu()方法void detailed_()方法pu
注意:本项目来自B站韩顺平老师 点此跳转
完整代码请看这里:gitee
点击这里 GitHub链接
如图:
(1)可以把收益入账和消费,保存到数组中(但目前学到的数组是定长的)
(2)可以使用对象
(3)可以使用String拼接
完成收益入账,完成功能驱动程序员增加新的变化的代码
(1)要接收收益入账的金额,并更新余额
(2)拼接好字符串
(3)找到时间如何输出,并且修改其输出格式
我用的字符串拼接
**
**:创建一个包 com.project.money.oop
然后创建两个类 SmallChangeSys和SmallChangeSysOOP
package com.project.money.oop;
public class SmallChangeSys {
public static void main(String[] args) {
SmallChangeSysOOP p=new SmallChangeSysOOP();
p.menu();
}
}
SmallChangeSysOOP用来实现具体功能
代码如下:
package com.project.money.oop;
import java.text.SimpleDateFORMat;
import java.util.Date;
import java.util.Scanner;
public class SmallChangeSysOOP {
private double in_money=0;//当前流动的钱
private double balance=0;//余额
private String detailed="------------零钱通明细--------------";
private Date date = null;
//可以用于日期格式化的
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm");
public void menu(){};
//1 零钱通明细
public void detailed_(){};
//2 收益入账"
public void input(){};
//3消费
public void output(){};
}
public void menu(){//菜单
boolean loop=true;
Scanner scanner = new Scanner(System.in);
while(loop){//循环展示菜单
System.out.println("\n============oop零钱通菜单==============");
System.out.println("\t\t1 零钱通明细");
System.out.println("\t\t2 收益入账");
System.out.println("\t\t3 消费");
System.out.println("\t\t4 退" + "\t" + "出");
System.out.print("请选择1-4:");int key= scanner.nextInt();//选择;
switch (key){
case 1:detailed_();break;
case 2:input();break;
case 3:output();break;
case 4:System.out.println("\t\t程序已经退出");loop=false;break;
}
}
}
public void detailed_(){
System.out.println(detailed);//直接输出字符
}
public void input(){//收益入账
Scanner scanner = new Scanner(System.in);
System.out.println("请输入金额:");
this.in_money=scanner.nextDouble();
while(in_money<0){
System.out.println("======输入有误======");
System.out.println("是否重新输入?Y(是)或 N(否) ");//可能点错了不是输入
String in=scanner.next();//是否重新输入
if(in.equals("n")||in.equals("N")){
System.out.println("返回主页面中....");
try {
Thread.sleep( 1000 );//暂停1秒提升用户感受
} catch (Exception e){}
return;//退出输入
}
System.out.println("请输入金额:");
this.in_money=scanner.nextDouble();
}
this.balance+=this.in_money;
String beizhu="";
date = new Date();
System.out.println("请输入备注:");
beizhu=scanner.next();
this.detailed+="\n收益入帐\t+" + this.in_money + "\t" + sdf.format(date) +
"\t余额:" + this.balance+ " 备注:" +beizhu;
}
**
**
public void output(){
System.out.println("请输入金额:");
Scanner scanner = new Scanner(System.in);
in_money=scanner.nextDouble();
if(balance<in_money){
System.out.println("余额不足,请充值");
return;
}
while(in_money<0){
System.out.println("输入错误,请重输");
in_money=scanner.nextDouble();
if(balance<in_money){
System.out.println("余额不足,请充值");
return;
}
}
this.balance-=in_money;
System.out.println("请输入备注:");
String beizhu=scanner.next();
this.detailed+="\n余额支出\t-" + this.in_money + "\t" + sdf.format(date) +
"\t余额:" + this.balance+ " 备注:" +beizhu;
}
package com.project.money.oop;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;
public class SmallChangeSysOOP {
private double in_money=0;//当前流动的钱
private double balance=0;//余额
private String detailed="------------零钱通明细--------------";
private Date date = null;
//可以用于日期格式化的
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm");
public void menu(){//菜单
boolean loop=true;
Scanner scanner = new Scanner(System.in);
while(loop){//循环展示菜单
System.out.println("\n============oop零钱通菜单==============");
System.out.println("\t\t1 零钱通明细");
System.out.println("\t\t2 收益入账");
System.out.println("\t\t3 消费");
System.out.println("\t\t4 退" + "\t" + "出");
System.out.print("请选择1-4:");int key= scanner.nextInt();//选择;
switch (key){
case 1:detailed_();break;
case 2:input();break;
case 3:output();break;
case 4:System.out.println("\t\t程序已经退出");loop=false;break;
}
}
}
//1 零钱通明细
public void detailed_(){
System.out.println(detailed);
}
//2 收益入账"
public void input(){//收益入账
Scanner scanner = new Scanner(System.in);
System.out.println("请输入金额:");
this.in_money=scanner.nextDouble();
while(in_money<0){
System.out.println("======输入有误======");
System.out.println("是否重新输入?Y(是)或 N(否) ");//可能点错了不是输入
String in=scanner.next();//是否重新输入
if(in.equals("n")||in.equals("N")){
System.out.println("返回主页面中....");
try {
Thread.sleep( 1000 );//暂停1秒提升用户感受
} catch (Exception e){}
return;//退出输入
}
System.out.println("请输入金额:");
this.in_money=scanner.nextDouble();
}
this.balance+=this.in_money;
String beizhu="";
date = new Date();
System.out.println("请输入备注:");
beizhu=scanner.next();
this.detailed+="\n收益入帐\t+" + this.in_money + "\t" + sdf.format(date) +
"\t余额:" + this.balance+ " 备注:" +beizhu;
}
//3消费
public void output(){
System.out.println("请输入金额:");
Scanner scanner = new Scanner(System.in);
in_money=scanner.nextDouble();
if(balance<in_money){
System.out.println("余额不足,请充值");
return;
}
while(in_money<0){
System.out.println("输入错误,请重输");
in_money=scanner.nextDouble();
if(balance<in_money){
System.out.println("余额不足,请充值");
return;
}
}
this.balance-=in_money;
System.out.println("请输入备注:");
String beizhu=scanner.next();
this.detailed+="\n余额支出\t-" + this.in_money + "\t" + sdf.format(date) +
"\t余额:" + this.balance+ " 备注:" +beizhu;
}
}
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