Assigning method references to Functional Interfaces

RefMs.java

package com.example.boxes;

import org.springframework.boot.CommandLineRunner;
import org.springframework.stereotype.Component;

import java.util.List;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.function.Supplier;

@Component
public class RefMs implements CommandLineRunner {

        @Override
        public void run(String... args) throws Exception {
            System.out.println("Hello from RefMs");

            List<String> sList = List.of("a", "b", "c", "d", "e", "", "f", "  ", "   ", "j");

            String myString = "mString";

            Supplier f = myString::isBlank;

            Function f2 = myString::equals;

            Predicate p = String::isBlank; // compilation error: Non-static method cannot be referenced from a static context

            Predicate<String> pp = String::isBlank; //this thing works
            
            sList.stream()
                    .filter(Predicate.not(String::isBlank))
                    .forEach(System.out::println);

        }

    public void newMethod(){

        Predicate p = String::isBlank; // compilation error: Non-static method cannot be referenced from a static context

        Predicate<String> pp = String::isBlank; //this thing works

    }



}