Практика7.2а

package com.company;

import java.util.function.Predicate;

public class Main {

    public static void main(String[] args) {
        String str1 = "Задание 2а", str2 = null;
        Predicate <String> Ref = (String str) -> str!=null;

        System.out.println(Ref.test(str1));
        System.out.println(Ref.test(str2));
    }
}