目标
面向过程版
代码
package new_pluse;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;
public class change_common{
public static void main(String arg[]){
//定义相关变量
Scanner scanner = new Scanner(System.in);
String key="";
String detaile="1 ==============零钱通明细============";
boolean loop=true;
double money=0;
double balance=0;
Date date=null;
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm");//格式化信息
do {
System.out.println("===========零钱通菜单==========");
System.out.println("\t\t\t1 零钱通明细");
System.out.println("\t\t\t2 收益入账");
System.out.println("\t\t\t3 消费");
System.out.println("\t\t\t4 退 出");
System.out.println("请选择(1-4)");
key=scanner.next();
switch (key) {
case "1":
System.out.println(detaile);
break;
case "2":
System.out.println("收益为多少");
money=scanner.nextDouble();
//money的值范围应该校验
balance+=money;
//拼接收益入账信息
date= new Date();//获取当前日期
detaile+="\n收益入账\t"+money+"\t"+sdf.format(date)+"\t"+balance;//拼接信息
System.out.println(detaile);
if (money<0) {
System.out.println("\n输入的金额应该大于0\n");
break;
}
break;
case "3":
System.out.println("3 消费金额");
money=scanner.nextDouble();
if (money<0||money>balance) {
System.out.println( "\n你消费的金额应该在0--"+balance);
break;
}
System.out.println("消费说明");
String note=scanner.next();
balance-=money;
detaile+="\n"+note+"\t"+money+"\t"+sdf.format(date)+"\t"+balance;//拼接信息
break;
case "4":
String choice="";
while(true) {
System.out.println("你确定要退出吗 y/n");
choice=scanner.next();
if ("y".equals(choice)||"n".equals(choice)) {
break;
}
}//判断是不是y或者n
//在用户退出后判断y或N
if (choice.equals("y")) {
loop=false;//退出
}
//看要不要退出
System.out.println("4 退出");
break;
default:
}
}while (loop);
System.out.println("========退出了零钱通项目=========");
}}
知识
- 运用do while语句实现整个主体循环
- 运用switch语句来进行选择不同功能
- 运用if语句进行金钱的逻辑判断
面对过程
就是每一个类实现一个功能 代码
package new_pluse;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;
public class oppo_change {
Scanner scanner = new Scanner(System.in);
String key="";
String detaile=" ==============零钱通明细============";
boolean loop=true;
double money=0;
double balance=0;
Date date=null;
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm");//格式化信息oppo
public void mainmenu() {
do {
System.out.println("===========零钱通菜单==========");
System.out.println("\t\t\t1 零钱通明细");
System.out.println("\t\t\t2 收益入账");
System.out.println("\t\t\t3 消费");
System.out.println("\t\t\t4 退 出");
System.out.println("请选择(1-4)");
key=scanner.next();
switch (key) {
case "1":
this.detail();
break;
case "2":
this.income();
// qpp.income(scanner, money, balance, detaile, sdf, date);
break;
case "3":
this.consum();
break;
case "4":
this.goout();
break;
}
} while (loop);
}
public void detail() {
System.out.println(detaile);
}
public void income() {
System.out.println("收益为多少");
money=scanner.nextDouble();
if (money<0) {
System.out.println("\n输入的金额应该大于0\n");
return;
}
//money的值范围应该校验
balance+=money;
//拼接收益入账信息
date= new Date();//获取当前日期
detaile+="\n收益入账\t"+money+"\t"+sdf.format(date)+"\t"+balance;//拼接信息
System.out.println(detaile);
}
public void consum(){
System.out.println("3 消费金额");
money=scanner.nextDouble();
if (money<0||money>balance) {
System.out.println( "\n你消费的金额应该在0--"+balance);
return;
}
System.out.println("消费说明");
String note=scanner.next();
balance-=money;
detaile+="\n"+note+"\t"+money+"\t"+sdf.format(date)+"\t"+balance;//拼接信息
System.out.println(detaile);
// break;
}
public void goout() {
String choice="";
while(true) {
System.out.println("你确定要退出吗 y/n");
choice=scanner.next();
if ("y".equals(choice)||"n".equals(choice)) {
break;
}
}//判断是不是y或者n
//在用户退出后判断y或N
if (choice.equals("y")) {
loop=false;//退出
}
//看要不要退出
System.out.println("4 退出");
return;
}
}
/*package new_pluse;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;
public class change_common{
public static void main(String arg[]){
//定义相关变量
Scanner scanner = new Scanner(System.in);
String key="";
String detaile="1 ==============零钱通明细============";
boolean loop=true;
double money=0;
double balance=0;
Date date=null;
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm");//格式化信息
do {
System.out.println("===========零钱通菜单==========");
System.out.println("\t\t\t1 零钱通明细");
System.out.println("\t\t\t2 收益入账");
System.out.println("\t\t\t3 消费");
System.out.println("\t\t\t4 退 出");
System.out.println("请选择(1-4)");
key=scanner.next();
switch (key) {
case "1":
System.out.println(detaile);
break;
case "2":
System.out.println("收益为多少");
money=scanner.nextDouble();
//money的值范围应该校验
balance+=money;
//拼接收益入账信息
date= new Date();//获取当前日期
detaile+="\n收益入账\t"+money+"\t"+sdf.format(date)+"\t"+balance;//拼接信息
System.out.println(detaile);
if (money<0) {
System.out.println("\n输入的金额应该大于0\n");
break;
}
break;
case "3":
System.out.println("3 消费金额");
money=scanner.nextDouble();
if (money<0||money>balance) {
System.out.println( "\n你消费的金额应该在0--"+balance);
break;
}
System.out.println("消费说明");
String note=scanner.next();
balance-=money;
detaile+="\n"+note+"\t"+money+"\t"+sdf.format(date)+"\t"+balance;//拼接信息
break;
case "4":
String choice="";
while(true) {
System.out.println("你确定要退出吗 y/n");
choice=scanner.next();
if ("y".equals(choice)||"n".equals(choice)) {
break;
}
}//判断是不是y或者n
//在用户退出后判断y或N
if (choice.equals("y")) {
loop=false;//退出
}
//看要不要退出
System.out.println("4 退出");
break;
default:
}
}while (loop);
System.out.println("========退出了零钱通项目=========");
}}
*/使用一个菜单类menue
public void mainmenu() {
do {
System.out.println("===========零钱通菜单==========");
System.out.println("\t\t\t1 零钱通明细");
System.out.println("\t\t\t2 收益入账");
System.out.println("\t\t\t3 消费");
System.out.println("\t\t\t4 退 出");
System.out.println("请选择(1-4)");
key=scanner.next();
switch (key) {
case "1":
this.detail();
break;
case "2":
this.income();
// qpp.income(scanner, money, balance, detaile, sdf, date);
break;
case "3":
this.consum();
break;
case "4":
this.goout();
break;
}
} while (loop);
}
来模仿每个行为
然后分别用方法构建每个行为 如detail,consum,goout等
public void detail() {
System.out.println(detaile);
}
public void income() {
System.out.println("收益为多少");
money=scanner.nextDouble();
if (money<0) {
System.out.println("\n输入的金额应该大于0\n");
return;
}
//money的值范围应该校验
balance+=money;
//拼接收益入账信息
date= new Date();//获取当前日期
detaile+="\n收益入账\t"+money+"\t"+sdf.format(date)+"\t"+balance;//拼接信息
System.out.println(detaile);
}
public void consum(){
System.out.println("3 消费金额");
money=scanner.nextDouble();
if (money<0||money>balance) {
System.out.println( "\n你消费的金额应该在0--"+balance);
return;
}
System.out.println("消费说明");
String note=scanner.next();
balance-=money;
detaile+="\n"+note+"\t"+money+"\t"+sdf.format(date)+"\t"+balance;//拼接信息
System.out.println(detaile);
// break;
}
public void goout() {
String choice="";
while(true) {
System.out.println("你确定要退出吗 y/n");
choice=scanner.next();
if ("y".equals(choice)||"n".equals(choice)) {
break;
}
}//判断是不是y或者n
//在用户退出后判断y或N
if (choice.equals("y")) {
loop=false;//退出
}
//看要不要退出
System.out.println("4 退出");
return;
}
