delete by predicate

package ch.claude_martin;

import java.util.HashMap;

public class SomeClass {
    public static void main(String[] args) {
        HashMap<Integer, String> map = new HashMap<>();
        map.put(1, "foo");
        map.put(2, "bar");
        map.put(3, "qux");
        map.put(4, "grault");
        map.put(5, "garply");
        map.put(6, "thud");
        map.put(7, "flob");
        System.out.println(map);
        // {1=foo, 2=bar, 3=qux, 4=grault, 5=garply, 6=thud, 7=flob}

        // delete by predicate
        map.entrySet().removeIf(e -> e.getValue().startsWith("f"));

        System.out.println(map);
        // {2=bar, 3=qux, 4=grault, 5=garply, 6=thud}
    }
}