用Java写个小Project：Mortgage calculator贷款计算器

最新推荐文章于 2023-10-24 18:02:24 发布

nolike666

最新推荐文章于 2023-10-24 18:02:24 发布

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CC 4.0 BY-SA版权

分类专栏： project 文章标签： java

本文链接：https://blog.youkuaiyun.com/nolike666/article/details/120593524

本文介绍了如何使用Java编写一个简单的房贷计算器。首先声明常量，使用Scanner对象获取用户输入，收集数据后计算贷款。通过NumberFormat格式化输出货币值。接着增加了数字限制功能，用while循环确保输入有效。为了代码复用，定义了readNumber()和calculateMortgage()方法。最后，新增了计算每月还款和支付计划的功能，包括calculateBalance()方法，以显示剩余余额。

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public class Main {

    public static void main(String[] args) {
        final byte Month_in_yeah = 12;
        final byte percent =100;
        //avoid magic number in your code

        Scanner scanner = new Scanner(System.in);

        System.out.print("Principal: ");
        int principal = scanner.nextInt();

        System.out.print("Annual Interest Rate: ");
        float annualInterest = scanner.nextFloat();
        float monthInterest = annualInterest / percent / Month_in_yeah;

        System.out.print("Period(Years): ");
        byte years = scanner.nextByte();
        int numberOfPayments = years * Month_in_yeah;

        double mortgage = principal
                * (monthInterest* Math.pow(1+monthInterest,numberOfPayments)
                /(Math.pow(1+monthInterest,numberOfPayments)-1));
        String mortgageFormatted = NumberFormat.getCurrencyInstance().format(mortgage);
        System.out.println("Mortgage:" + mortgageFormatted);




    }
}

一.过程描述：

1.declaing constance 声明常量（avoid magic number）

2.created scanner object 创建scanner对象

3.ask question and read it as an integer/float/byte 提问并将它储存为整数/小数/字节

4.after collect all datas then we calculate the mortgage 收集数据后计算贷款

5.use numberFormat class to format this value as currency，store and print it 储存打印

结果：

Principal: 200000
Annual Interest Rate: 0.32
Period(Years): 1
Mortgage:¥16,695.29

二.增加功能：数字限制

package com.company;
import org.w3c.dom.ls.LSOutput;

import java.awt.*;
import java.text.NumberFormat;
import java.util.Arrays;
import java.util.Date;
import java.util.Locale;
import java.util.Scanner;

    public class Main {

        public static void main(String[] args) {
            final byte Month_in_yeah = 12;
            final byte percent =100;
            //avoid magic number in your code

            int principal = 0;
            float monthInterest = 0;
            int numberOfPayments = 0;
            Scanner scanner = new Scanner(System.in);


            while(true){
                System.out.print("Principal: ");
                principal = scanner.nextInt();
                if (principal >= 1000 &a