计算每月还款金额

package com.JUL10;

import java.util.Scanner;

// 计算每月还款金额
public class JiSuan {
    double zJE = 0; // 总金额
    int age = 0; // 贷款多少年

    boolean boo = true; // 判断输入年限的有效值

    public JiSuan() {
    }

    public JiSuan(int age, double jE) {
        if (age > 0 && age <= 20 && jE >= 10000) {
            boo = true;
            this.age = age;
            if (age <= 3) {
                double liXi = 0.0603 * age;
                this.zJE = jE * (1 + liXi);
            } else if (age <= 5) {
                double liXi = 0.0612 * age;
                this.zJE = jE * (1 + liXi);
            } else if (age <= 20) {
                double liXi = 0.0639 * age;
                this.zJE = jE * (1 + liXi);
            }
        } else {
            boo = false;
        }
    }

    public void jiSuan() {
        double myhk = this.zJE / (this.age * 12);
        System.out.println("********月供为：" + myhk);
    }

    static Scanner input = new Scanner(System.in);

    public static void main(String[] args) {
        do {
            System.out.println("请输入贷款金额(最少不低于10000)：");
            double money = input.nextDouble();
            System.out.println("请输入贷款年份（1~20）：");
            int age = input.nextInt();
            JiSuan j1 = new JiSuan(age, money);
            if (j1.boo) {
                System.out.println("还款总金额：" + j1.zJE);
                j1.jiSuan();
            } else {
                System.out.println("输入的贷款年限或贷款金额有误！");
            }
            System.out.println("………………………………………………………………………………………………………………");
        } while (true);
    }
}