程序源代码：
import java.util.Scanner;
public class ch {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("复利计算器：计算复利终值请按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();
//选择计算对象单利终值
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);
}
//选择计算对象应投入的本金
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);
}
//选择计算对象需要时间
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);
}
//选择计算对象利率
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);
}
//选择计算对象利率资产总值
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("若投资本金固定不变，则资产总值为：" + 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，则资产总值为：" + sum);
}
}
}