java课程作业一,传入字符串求和

 1 public class Course1 {
 2       public static void main(String[]ars) {
 3           double sum = 0; 
 4           int len = ars.length;
 5           for(int i = 0;i<len;++i) {
 6               if((i+1)%2==0)System.out.print(" + ");
 7               sum+=Double.valueOf(ars[i]);
 8               System.out.print(ars[i]);
 9           }
10           System.out.println(" = "+sum);
11       }
12 }