匿名クラスとラムダと時々弱参照

Main.java

import java.lang.ref.WeakReference;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Main main = new Main();
        main.run();
    }

    private void run() {
        Hoge hoge1 = new Hoge() {
            @Override
            public void run() {
                System.out.println("匿名クラス");
            }
        };
        Hoge hoge2 = () -> System.out.println("ラムダ");
        WeakReference<Hoge> a = new WeakReference<>(hoge1);
        WeakReference<Hoge> b = new WeakReference<>(hoge2);

        hoge1 = null;
        hoge2 = null;

        System.gc();

        System.out.println(a.get());
        System.out.println(b.get());
    }
}

@FunctionalInterface
interface Hoge {
    void run();
}

出力
null
Main$$Lambda$1/295530567@3b07d329