java实现用户从键盘输入两个实数,输出它们的和

 1 //用户从键盘输入两个实数,输出它们的和
 2 package classwork8;
 3 
 4 import java.util.Scanner;
 5 
 6 public class Double_test {
 7 
 8     public static void main(String[] args) {
 9         double x,y;
10         Scanner in=new Scanner(System.in);
11         x=in.nextDouble();
12         y=in.nextDouble();
13         Double a=new Double(x);
14         Double b=new Double(y);
15         System.out.println(a.sum(x, y));
16         System.out.println(b.sum(a, b));
17     }
18 
19 }