hsp第八章java零钱通项目（面向过程和对象版）

 面向过程

package smallchange;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;

//以下为面向过程
public class smallChangeSys {
    public static void main(String[] args) {
        boolean loop = true;
        int choice = 0;
        String details = "--------零钱通明细-----------n";
        double balance = 0;
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm"); //可以用于日期格式化的
        Date date = new Date();
        double pay = 0;
        String name = " ";
        String choose = " ";
        do {
            System.out.println("=========零钱通菜单=========");
            System.out.println("       1 零钱通明细");
            System.out.println("       2 收益入账");
            System.out.println("       3 消费");
            System.out.println("       4 退       出");
            System.out.print("请选择（1-4）：");
            Scanner scanner = new Scanner(System.in);
            choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    System.out.println(details);
                    break;
                case 2:
                    //收益
                        System.out.print("请输入收益金额");
                        double income = scanner.nextDouble();
                        if (income <= 0) {
                            System.out.println("收益金额应当大于0");
                            break;
                        }
                        balance += income;
                        details += "收益入账t+" + income + "tt" + sdf.format(date) + "t余额" + balance + "n";
                        //System.out.println(details);
                    break;
                case 3:
                    //支出
                        System.out.print("请输入消费金额");
                        pay = scanner.nextDouble();
                        if (pay <= 0 || pay > balance) {
                            System.out.println("消费金额应当大于0小于" + balance);
                            break;
                        }
                        System.out.println("请输入消费场所");
                        name = scanner.next();
                        balance -=pay;
                        details += name + "t-" + pay + "t" + sdf.format(date) + "t余额" + balance + "n";
                       // System.out.println(details);
                    break;
                case 4:
                    //退出
                    boolean a = true;
                    do {
                        System.out.println("你确定退出吗？y/n");
                        choose = scanner.next();
                        if (choose.equals("y") || choose.equals("n")) {
                            a = false;
                        }
                    } while (a);
                    if (choose.equals("y")) {
                        loop = false;
                    }
                    break;
            }
        } while (loop) ;
    }
}

 面向对象

package smallchange;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;

public class SmallChangeSysOop {
    boolean loop = true;
    int choice = 0;
    String details = "--------零钱通明细-----------n";
    double balance = 0;
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm"); //可以用于日期格式化的
    Date date = new Date();
    double pay = 0;
    String name = " ";
    String choose = " ";
    Scanner scanner = new Scanner(System.in);

    public void mainMenu(){
        do {
            System.out.println("=========零钱通菜单=========");
            System.out.println("       1 零钱通明细");
            System.out.println("       2 收益入账");
            System.out.println("       3 消费");
            System.out.println("       4 退       出");
            System.out.print("请选择（1-4）：");
            choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    detail();
                    break;
                case 2:
                    //收益
                    income();
                    break;
                case 3:
                    //支出
                   consume();
                    break;
                case 4:
                    //退出
                    exit();
                    break;
            }
        } while (loop) ;
    }
    public void detail(){
        System.out.println(details);
    }

    public void income(){
        //收益
        System.out.print("请输入收益金额");
        double income = scanner.nextDouble();
        if (income <= 0) {
            System.out.println("收益金额应当大于0");
            return;
        }
        balance += income;
        details += "收益入账t+" + income + "tt" + sdf.format(date) + "t余额" + balance + "n";
        //System.out.println(details);
       // return;
    }

    public void consume(){
        //支出
        System.out.print("请输入消费金额");
        pay = scanner.nextDouble();
        if (pay <= 0 || pay > balance) {
            System.out.println("消费金额应当大于0小于" + balance);
            return;
        }
        System.out.println("请输入消费场所");
        name = scanner.next();
        balance -=pay;
        details += name + "t-" + pay + "t" + sdf.format(date) + "t余额" + balance + "n";
        // System.out.println(details);
    }
    public void exit() {
        //退出
        boolean a = true;
        do {
            System.out.println("你确定退出吗？y/n");
            choose = scanner.next();
            if (choose.equals("y") || choose.equals("n")) {
                a = false;
            }
        } while (a);
        if (choose.equals("y")) {
            loop = false;
        }
    }

}

package smallchange;

public class Test {
    public static void main(String[] args) {
        SmallChangeSysOop scs = new SmallChangeSysOop();
        scs.mainMenu();

    }
}