Clones the lhs map and add all things from the rhs map. : Collection « Collections Data Structure « Java

Clones the lhs map and add all things from the rhs map.

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

public class Main {
   * Clones the lhs map and add all things from the
   * rhs map.
   * @param lhs the first map
   * @param rhs the second map
   * @return the merged map
  public static Map merge(Map lhs, Map rhs) {

      Map result = null;

      if((lhs == null) || (lhs.size() == 0)) {
          result = copy(rhs);
      else if((rhs == null) || (rhs.size() == 0)) {
          result = copy(lhs);
      else {
          result = copy(lhs);
      return result;
   * Clones a map.
   * @param source the source map
   * @return the clone of the source map
  public static Map copy(Map source) {

      if(source == null) {
          return null;

      Map result = new HashMap();
      return result;



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