import java.util.Scanner;public class calculate4 {    public static void main(String[] args) {        // TODO 自动生成的方法存根        Scanner scanner = new Scanner(System.in);        System.out.println("复利计算器：计算复利和单利终值请按1,计算本金请按2；股票投资：计算时间请按3，计算报酬率请按4，计算资产总值请按5" );        int num=scanner.nextInt();        if (num == 1) {            double N = 1, sum;            System.out.print("请输入本金：");            double money = scanner.nextDouble();            System.out.print("请输入存钱年数：");            int years = scanner.nextInt();            System.out.print("请输入利率：");            double r = scanner.nextDouble();            sum = money + money * years * r;            System.out.println("单利终值为：" + sum);            sum = 0;            for (int i = 1; i <= years; i++) {                N = (1 + r) * N;            }            sum = N * money;            System.out.println("复利终值为：" + sum);        }        if (num == 2) {            double N = 1, money;            System.out.print("请输入复利终值：");            double sum = scanner.nextDouble();            System.out.print("请输入存钱年数：");            int years = scanner.nextInt();            System.out.print("请输入利率：");            double r = scanner.nextDouble();            for (int i = 1; i <= years; i++) {                N = (1 + r) * N;            }            money = sum / N;            System.out.println("应投入的本金为：" + money);        }        if (num == 3) {            double years;            System.out.print("请输入本金：");            double money = scanner.nextDouble();            System.out.print("请输入最后得到资产总值：");            double sum = scanner.nextDouble();            System.out.print("请输入利率：");            double r = scanner.nextDouble();                    years = sum / (money * r);            System.out.println("时间为（年）：" + years);        }        if (num == 4) {            double r;            System.out.print("请输入本金：");            double money = scanner.nextDouble();            System.out.print("请输入最后得到资产总值：");            double sum = scanner.nextDouble();            System.out.print("请输入存钱年数：");            int years = scanner.nextInt();            r=sum/(money*years);            System.out.println("利率为：" + r);        }        if (num == 5){            double sum;            System.out.print("请输入本金：");            double money = scanner.nextDouble();            System.out.print("请输入利率：");            double r = scanner.nextDouble();            System.out.print("请输入存钱年数：");            int years = scanner.nextInt();            sum=money*r*years;            System.out.println("若投资本金每年固定不变，则最后得到的资产总值为：" + sum);            sum=0;            for(int i=1;i<=years;i++){                sum=money*r*1;                money=sum;                            }            System.out.println("若连本带利投资，则最后得到的资产总值为：" + sum);        }    }}

 

本次程序的功能是你可以自由选择你想要计算的功能，如：计算股票投资的资产总值、报酬率和时间，

选择之后便会出现相应的数据让用户填写，最后用户便可以得到自己想要的结果。