How do you make a static reference to a method? I've included code.

Question

I'm sorry but this is a cross post. This should be here but it is also in the 100% pure Java forum. It won't happen again.
Now...
Why doesn't this work? How do I use the method add(int a, int b)?
ERROR - "Can't make static reference to method int add(int, int) in testClass"
interface testInterface{   
    static String sString = "TESTING";   
    public int add(int a, int b);
class testClass implements testInterface{
    public int add(int a, int b){
        return a+b;      
    public static void main(String argv[]){
        int sum = add(3,4);    // here's the error
        System.out.println("test");
        System.out.println( sum );   
}Again, I apologize for the cross post.

Answer 1

hi,
this seems to be pretty easy, isn't it?
Oh c'mon! You try to invoke a non-static method from within a static method. Solution: Create a specific instance of class testClass:
testClass test=new testClass();
test.add(3,4);best regards, Michael