Java实例项目零钱通的实现流程

Java实例项目零钱通的实现流程

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：publicvoidmenu()方法voiddetailed_()方法publicvoidinput()方法publicvoidoutput()方法SmallChangeSysOOP完整代码一些图片

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：

老韩思路：

（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

**

一些说明

**：创建一个包 com.project.money.oop

然后创建两个类 SmallChangeSys和SmallChangeSysOOP

SmallChangeSys 用来写main方法代码如下

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(){};

}

具体说明各个方法的作用：

public void menu()方法

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;

}

}

}

void detailed_()方法

public void detailed_(){

System.out.println(detailed);//直接输出字符

}

public void input()方法

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()方法

**

public void output(){

System.out.println("请输入金额：");

Scanner scanner = new Scanner(System.in);

in_money=scanner.nextDouble();

if(balance

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

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;

}

SmallChangeSysOOP完整代码

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.nhttp://extDouble();

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

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

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;

}

}

一些图片

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

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;

}

SmallChangeSysOOP完整代码

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.nhttp://extDouble();

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

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

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;

}

}

一些图片

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;

}

SmallChangeSysOOP完整代码

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.nhttp://extDouble();

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

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

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;

}

}

一些图片

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

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;

}

}

一些图片

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;

}

}

一些图片

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