我如何从另一个 class 调用该方法？

Question

Hi i am trying to solve the problem I am facing

public class exam {
    public static void main(String[] args) {
        test1 a = new test1();
        
       }
    int zahl(int x, int y) {
        int e;
        if(x>y) {
            e=x-y;
        }else {
            e=y-x;
        }
        if(e==0) {
            return 0;
        }
        int z=0;
        int i=1;
        while(i<=e) {
            z=z+i;
            i++;
        }
        return z;
    }

}

what I want to do is to call the zahl method to the test1 class

public class test1{
    private exam b;
    
    public void init() {
        b = new exam();
    }
    void test() {
        int result = b.zahl(2, 2);
        assertEquals(1, result);
    }

}

this is what I have tried, but it returns nothing, even though it's supposed to show me error.

Answer 1

You should probably be declaring your functions with the public tag ie public void test() if you intend to access them from other functions outside of that package. The usual Class naming convention in Java is with capital first letter, which makes your code more readable for you and others.

For your question, I don't think you are actually invoking the test() method of the test1 class. If you want that method to get called every time, you could place it inside the default Constructor.