submit the ExFunction.java

collaboration/ExFunction.java

@@ -12,11 +12,6 @@ public class ExFunction {
         this.x = x;
     }
 
-    public static void main(String[] args) {
-        ExFunction exFunction = new ExFunction(0);
-        System.out.println(exFunction.index());
-    }
-
     public double index() {
         return Math.exp(x);
     }