Java Collection Tutorial - Java HashMap() Constructor


HashMap() constructor from HashMap has the following syntax.

public HashMap()


In the following code shows how to use HashMap.HashMap() constructor.

 /*from  w  ww  . j  a v  a 2 m*/
import java.util.HashMap;

public class Main {
  public static void main(String[] a) {
    HashMap<String,String> map = new HashMap<String,String>();
    map.put("key1", "value1");
    map.put("key2", "value2");
    map.put("key3", "value3");

    HashMap map2 = (HashMap)map.clone();

The code above generates the following result.