复利计算单元测试

因为eclipse程序故障用不了，所以使用myeclipse进行单元测试

package ch1;

import java.util.InputMismatchException;
import java.util.Scanner;

public class fuli {

public static void main(String[] args) {
        System.out.print("请选择求单利1,复利2,本金3,时间4,利率5,投资6,贷款月还款计算7,退出8");
        Scanner scanner = new Scanner(System.in);
int a = scanner.nextInt();
switch (a) {
case 1:
            danli();
break;
case 2:
            fulili();
break;
case 3:
            benjin();
break;
case 4:
            shijian();
break;
case 5:
            lilv();
break;
case 6:
            touzi();
break;
case 7:
            huankuan();
break;
case 8:
break;
default:
            System.out.print("请重新输入");
            main(null);
            scanner.close();

        }

    }

static void benjin() {
// TODO Auto-generated method stub
        Scanner scanner = new Scanner(System.in);
try {
            System.out.print("请输入预期钱数");
double A = Math.abs(scanner.nextDouble());
            System.out.print("请输入年利率");
double B = Math.abs(scanner.nextDouble());
            System.out.print("请输入存入年限");
int C = Math.abs(scanner.nextInt());
double D = 1;
for (int i = 1; i <= C; i++) {
                D = D * (1 + B);
            }
            System.out.println("本金" + String.format("%.4f", (A / D)));
        } catch (InputMismatchException e) {
            benjin();
        }
        main(null);
        scanner.close();
    }

static void fulili() {
        Scanner scanner = new Scanner(System.in);
try {
            System.out.print("请输入本金");
double A = Math.abs(scanner.nextDouble());
            System.out.print("请输入年利率");
double B = Math.abs(scanner.nextDouble());
            System.out.print("请输入存入年限");
int C = Math.abs(scanner.nextInt());
double D = 1;
for (int i = 1; i <= C; i++) {
                D = D * (1 + B);
            }
            System.out.println("复利终值" + String.format("%.4f", (A * D)));
        } catch (InputMismatchException e) {
            fulili();
        }
        main(null);
        scanner.close();
    }

static void danli() {
        Scanner scanner = new Scanner(System.in);
try {
            System.out.print("请输入本金");
double A = Math.abs(scanner.nextDouble());
            System.out.print("请输入年利率");
double B = Math.abs(scanner.nextDouble());
            System.out.print("请输入存入年限");
int C = Math.abs(scanner.nextInt());
double D = 1;
            D = A * B * C;
            System.out.println("单利终值" + (A + D));
        } catch (InputMismatchException e) {
            danli();
        }
        main(null);
        scanner.close();
    }

static void shijian() {
        Scanner scanner = new Scanner(System.in);
try {
            System.out.print("请输入本金");
double A = Math.abs(scanner.nextDouble());
            System.out.print("请输入年利率");
double B = Math.abs(scanner.nextDouble());
            System.out.print("请输入预期金额");
double C = Math.abs(scanner.nextDouble());
double D = 1;
double E = 1;
int i = 1;

while (true) {
                D = D * (1 + B);
                E = A * D;
if (E <= C)
                    i++;
else
break;
            }

            System.out.println("需" + i + "年");
        } catch (InputMismatchException e) {
            shijian();
        }
        main(null);
        scanner.close();
    }

static void lilv() {
        Scanner scanner = new Scanner(System.in);
try {
            System.out.print("请输入本金");
double A = Math.abs(scanner.nextDouble());
            System.out.print("请输入预期金额");
double B = Math.abs(scanner.nextDouble());
            System.out.print("请输入存入年限");
double C = Math.abs(scanner.nextDouble());
double D = 1;
            D = Math.pow(B / A, 1 / C) - 1;
            System.out.println("利率为" + String.format("%.4f", D));
        } catch (InputMismatchException e) {
            lilv();
        }
        main(null);
        scanner.close();
    }

static void touzi() {
// TODO Auto-generated method stub
        Scanner scanner = new Scanner(System.in);
try {
            System.out.print("请输入投资额");
double A = Math.abs(scanner.nextDouble());
            System.out.print("请输入年利率");
double B = Math.abs(scanner.nextDouble());
            System.out.print("请输入存入年限");
int C = Math.abs(scanner.nextInt());
double D = 0;
for (int i = 1; i <= C; i++) {
                D = D + A;
                D = D * (1 + B);
            }
            System.out.println("最终获利" + String.format("%.4f", D));
        } catch (InputMismatchException e) {
            touzi();
        }
        main(null);
        scanner.close();
    }

static void huankuan() {
// TODO 自动生成的方法存根
        Scanner scanner = new Scanner(System.in);
try {
            System.out.print("请输入贷款额");
double A = Math.abs(scanner.nextDouble());
            System.out.print("请输入贷款利率");
double B = Math.abs(scanner.nextDouble());
            System.out.print("请输入贷款年限");
int C = Math.abs(scanner.nextInt());
double D = 0;
for (int i = 1; i <= C; i++) {
                D = A * Math.pow(1.0 + B, C);
            }
double Repayment = D / (C * 12);
double interest = A * B * C;
double sum = A + interest;
double Repayment1 = sum / (C * 12);
            System.out.println("每月需要还款(单利)" + Repayment1);
            System.out.println("每月需要还款(复利)" + String.format("%.4f", Repayment));
        } catch (InputMismatchException e) {
            huankuan();
        }
        main(null);
        scanner.close();
    }

}

 

首先进行测试是数值的大小输入

如图，输入过大数值

与预期结果一致，所以没有问题

再试试输入字符，如图

输入字符后显示重新输入，所以也没有问题

输入负值

 

出现负值的计算，负值输入的时候应该是重新输入

还进行了一部分的测试，由于问题比较多，还在改进，所以没有一一展示，会对复利计算进一步跟进完善的。