Deep Copying HashMap

[V Bose]

If I construct a new HashMap from an existing one like

HashMap copy = new HasMap(original);

is it a deep copy of the 'original' HashMap.

[Dan Chisholm]

The two HashMaps will contain unique maps, but the maps reference the same objects.

import java.util.*;
 
class DeepTest {
  public static void main(String[] args) {
    StringBuffer sb1 = new StringBuffer("SB1");
    StringBuffer sb2 = new StringBuffer("SB2");
 
    HashMap hm1 = new HashMap();
 
    hm1.put("sb1", sb1);
    hm1.put("sb2", sb2);
 
    HashMap hm2 = new HashMap(hm1);
 
    System.out.println("hm2 contains the same elements as hm1.");
    System.out.println(hm2.get("sb1") + ", " + hm2.get("sb2"));
 
    hm1.remove("sb1");
 
    System.out.println("hm1 no longer contains sb1.");
    System.out.println(hm1.get("sb1") + ", " + hm1.get("sb2"));
 
    System.out.println("hm2 still contains sb1.");
    System.out.println(hm2.get("sb1") + ", " + hm2.get("sb2"));
 
    sb2.append("XXX");
 
    System.out.println("In hm1, XXX has been appended to sb2.");
    System.out.println(hm1.get("sb2"));
 
    System.out.println("In hm2, XXX has been appended to sb2.");
    System.out.println(hm2.get("sb2"));
  }
}

[Dirk Schreckmann]

Moving this to the Intermediate forum...

[farhan java]

so anybody knows the solution how to copy hashmap into another hashmap with the key-value pair, without haveing same refernce.

please reply urgently.