如圖:
(1)可以把收益入帳和消費,保存到陣列中(但目前學到的陣列是定長的)
(2)可以使用物件
(3)可以使用String拼接
完成收益入賬,完成功能驅動程式設計師增加新的變更的代碼
(1)要接收收益入帳的金額,並更新餘額
(2)拼接好字符字串
(3)找到時間如何輸出,並且修改其輸出格式
我用的字串拼接
建立一個套件com.project.money.oop
然後建立兩個類別SmallChangeSys和SmallChangeSysOOP
package com.project.money.oop; public class SmallChangeSys { public static void main(String[] args) { SmallChangeSysOOP p=new SmallChangeSysOOP(); p.menu(); } }
#
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; } }
rrreeeSmallChangeSysOOP完整程式碼
rrreee一些圖片
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