hashmap copy benchmark

Benchmarks.java

import org.openjdk.jmh.annotations.Benchmark;

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

public class Benchmarks {
    private static final Map<String, String> STRINGS;

    static {
        STRINGS = new HashMap<>();
        STRINGS.put("test1", "value1");
        STRINGS.put("test2", "value2");
        STRINGS.put("test3", "value3");
        STRINGS.put("test4", "value4");
        STRINGS.put("test5", "value5");
    }

    private static final HashMap<String, String> PROPERTIES = new HashMap<>(STRINGS);

    static class Entity {
        private HashMap<String, String> properties = new HashMap<>();

        public HashMap<String, String> getProperties() {
            return properties;
        }

        public void setProperties(HashMap<String, String> properties) {
            this.properties = properties;
        }

        public void copyProperties(Map<String, String> properties) {
            this.properties = new HashMap<>(properties);
        }
    }

    private static final Entity entity = new Entity();

    @Benchmark
    public void measureAssignment() {
        entity.setProperties(PROPERTIES);
    }

    @Benchmark
    public void measureCopy() {
        entity.copyProperties(PROPERTIES);
    }
}