如何在java中正确清除Map

import java.util.HashMap;
import java.util.Map;

public class MapClearExample {
    public static void main(String[] args) {
        Map<String, String> map = new HashMap<>();
        map.put("key1", "value1");
        map.put("key2", "value2");

        System.out.println("Before clear: " + map);

        map.clear();

        System.out.println("After clear: " + map);
    }
}

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

public class MapClearWithIteratorExample {
    public static void main(String[] args) {
        Map<String, String> map = new HashMap<>();
        map.put("key1", "value1");
        map.put("key2", "value2");

        System.out.println("Before clear: " + map);

        Iterator<Map.Entry<String, String>> iterator = map.entrySet().iterator();
        while (iterator.hasNext()) {
            iterator.next();
            iterator.remove();
        }

        System.out.println("After clear: " + map);
    }
}

import java.util.HashMap;
import java.util.Map;

public class MapClearWithStreamExample {
    public static void main(String[] args) {
        Map<String, String> map = new HashMap<>();
        map.put("key1", "value1");
        map.put("key2", "value2");

        System.out.println("Before clear: " + map);

        map.entrySet().removeIf(entry -> true);

        System.out.println("After clear: " + map);
    }
}