1 import java.util.Scanner; 2  3 public class Fulijisuan { 4  5     public static void main(String[] args) { 6         // TODO Auto-generated method stub 7         double N=1; 8         Scanner scanner=new Scanner(System.in); 9         System.out.print("若要计算本金请按3否则按0:");10         int num=scanner.nextInt();11         if(num==3){12             double money;13             float year=30;14             float total=3000000;15             double a=0.30;16             for(int j=1;j<=year;j++){17                 N=(1+a)*N;18             }19             money=total/N;20             System.out.println("需要本金："+money);21         }22         System.out.print("请选择复利计算(1)or单利计算(2):");23         int choose=scanner.nextInt();24         25         System.out.print("请输入本金：");26         float P=scanner.nextInt();27         System.out.print("请输入利率：");28         float i=scanner.nextFloat();29         System.out.print("存入时间：");30         float n=scanner.nextFloat();31         32         if(choose==1){33             fuli(N, P, i, n);34         }35         else if(choose==2){36             danli(P, i,n);37         }38         39     }40 41     private static void danli(double P, double i,double n) {42         double G; 43         44         G=P+P*i*n;45         System.out.print("单利终值为："+G);46     }47 48     private static void fuli(double N, double P, double i, double n) {49         for(int j=1;j<=n;j++){50             51             N=(1+i)*N;52         }53         double F;54         F=P*N;55         System.out.print("复利终值为："+F);56     }57 58 59 }