BiFunctionExample.java

package com.learn.functionalInterfaces;

import com.learn.data.Student;
import com.learn.data.StudentDataBase;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.function.BiFunction;
import java.util.function.Predicate;

public class BiFunctionExample {

    static BiFunction<List<Student>, Predicate<Student>, Map<String, Double>> biFunction =
            ((students, studentPredicate) -> {
                Map<String, Double> studentGradeMap = new HashMap<>();
                students.forEach(student -> {
                    if (studentPredicate.test(student)) {
                        studentGradeMap.put(student.getName(), student.getGpa());
                    }
                });
                return studentGradeMap;
            });
    public static void main(String[] args) {

        System.out.println(biFunction.apply(StudentDataBase.getAllStudents(), PredicateStudentExample.predicate1));

    }
}