Java how to compare Predicates

Question

I have two prodicates :

Predicate<CategoryModel> predicate1 = NavigationCategoryModel.class::isInstance;
Predicate<CategoryModel> predicate2 = BrandCategoryModel.class::isInstance;

With and if statement , how can I identify which predicate am I using ? I'm trying to do something like this but obviously isn't compiling :

if(predicate1.equals(NavigationCategoryModel.class::isInstance)){
}

if(predicate1==NavigationCategoryModel.class::isInstance){
}

Any hint ? I'm quite new to Java 8 lambdas

This is the code of the Pojos (simple inheritance for test purposes):

public class CategoryModel {
}

public class NavigationCategoryModel  extends CategoryModel{
}

public class BrandCategoryModel extends CategoryModel {
}

Answer 1

You should use test method on Predicates. And, you've to provide the object to perform validation instead of actual method reference

predicate.test(object)

Documentation: Predicate#test

For your problem, you can test if predicate1 returns true when object is of type NavigationCategoryModel as below:

predicate1.test(new NavigationCategoryModel()) // returns true

Similarly, for BrandCategoryModel, use:

predicate2.test(new BrandCategoryModel()) // returns true

If you want to test that object matches either of two, you can combine both the predicates like:

predicate1.or(predicate2).test(new NavigationCategoryModel()) // returns true
predicate1.or(predicate2).test(new BrandCategoryModel()) // returns true