Question

I have class:

public class GridResponse<V> {
    public void setPage(int page) {
        this.page = page;
    } 
}

And class implemented Comparator:

public class GridComparator<GridResponse> implements Comparator<GridResponse> {
    @Override
    public int compare(GridResponse o1, GridResponse o2) {
        o1.setPage = '1';
        return 0;
    }
}

What is wrong in class GridComparator, because I don’t have access to function in GridResponse? Why?

Answer 1

The GridComparator class should not be generic at all, it is specific for the GridResponse class.

public class GridComparator implements Comparator<GridResponse<Integer>> {
    @Override
    public int compare(GridResponse<Integer> o1, GridResponse<Integer> o2) {
        o1.setPage(1);
        return 0;
    }
}