importjava.util.Scanner;public classch {public static voidmain(String[] args) {

Scanner scanner= newScanner(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) {doubleyears;

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) {doubler;

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){doublesum;

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);

}

}

}