@@ -91,9 +91,21 @@ of this software and associated documentation files (the "Software"), to deal
9191 * </ul>
9292 *
9393 * @author JSON.org
94- * @version 2012-10-27
94+ * @version 2012-12-01
9595 */
9696public class JSONObject {
97+ /**
98+ * The maximum number of keys in the key pool.
99+ */
100+ private static final int keyPoolSize =100 ;
101+
102+ /**
103+ * Key pooling is like string interning, but without permanently tying up
104+ * memory. To help conserve memory, storage of duplicated key strings in
105+ * JSONObjects will be avoided by using a key pool to manage unique key
106+ * string objects. This is used by JSONObject.put(string, object).
107+ */
108+ private static HashMap keyPool =new HashMap (keyPoolSize );
97109
98110/**
99111 * JSONObject.NULL is equivalent to the value that JavaScript calls null,
@@ -1110,11 +1122,21 @@ public JSONObject put(String key, Map value) throws JSONException {
11101122 * or if the key is null.
11111123 */
11121124public JSONObject put (String key ,Object value )throws JSONException {
1125+ String pooled ;
11131126if (key ==null ) {
11141127throw new JSONException ("Null key." );
11151128 }
11161129if (value !=null ) {
11171130testValidity (value );
1131+ pooled = (String )keyPool .get (key );
1132+ if (pooled ==null ) {
1133+ if (keyPool .size () >=keyPoolSize ) {
1134+ keyPool =new HashMap (keyPoolSize );
1135+ }
1136+ keyPool .put (key ,key );
1137+ }else {
1138+ key =pooled ;
1139+ }
11181140this .map .put (key ,value );
11191141 }else {
11201142this .remove (key );
