Use better name for parser configuration option, fix API comment.

src/main/java/org/json/JSONObject.java

@@ -332,7 +332,7 @@ public class JSONObject {
         	        throw new NullPointerException("Null key.");
         	    }
                 final Object value = e.getValue();
-                if (value != null || jsonParserConfiguration.isJavaNullAsJsonNull()) {
+                if (value != null || jsonParserConfiguration.isUseNativeNulls()) {
                     testValidity(value);
                     this.map.put(String.valueOf(e.getKey()), wrap(value, recursionDepth + 1, jsonParserConfiguration));
                 }

src/main/java/org/json/JSONParserConfiguration.java

@@ -10,9 +10,9 @@ public class JSONParserConfiguration extends ParserConfiguration {
     private boolean overwriteDuplicateKey;
     
     /**
-     * Used to indicate whether ignore null values when converting java maps to JSONObject or not.
+     * Used to indicate whether to convert java null values to JSONObject.NULL or ignoring the entry when converting java maps.
      */
-    private boolean javaNullAsJsonNull;
+    private boolean useNativeNulls;
 
     /**
      * Configuration with the default values.
@@ -74,16 +74,16 @@ public class JSONParserConfiguration extends ParserConfiguration {
     }
     
     /**
-     * Controls the parser's behavior when meeting duplicate keys.
+     * Controls the parser's behavior when meeting Java null values while converting maps.
-     * If set to false, the parser will throw a JSONException when meeting a duplicate key.
+     * If set to true, the parser will put a JSONObject.NULL into the resulting JSONObject.
-     * Or the duplicate key's value will be overwritten.
+     * Or the map entry will be ignored.
      *
-     * @param javaNullAsJsonNull define, if the parser should ignore null values in Java maps
+     * @param useNativeNulls defines if the parser should convert null values in Java maps
      * @return The existing configuration will not be modified. A new configuration is returned.
      */
-    public JSONParserConfiguration withJavaNullAsJsonNull(final boolean javaNullAsJsonNull) {
+    public JSONParserConfiguration withUseNativeNulls(final boolean useNativeNulls) {
         JSONParserConfiguration clone = this.clone();
-        clone.javaNullAsJsonNull = javaNullAsJsonNull;
+        clone.useNativeNulls = useNativeNulls;
 
         return clone;
     }
@@ -128,13 +128,14 @@ public class JSONParserConfiguration extends ParserConfiguration {
     }
     
     /**
-     * The parser's behavior when meeting a null value in a java map, controls whether the parser should ignore 
+     * The parser's behavior when meeting a null value in a java map, controls whether the parser should 
-     * that map entry or write a JSON entry with a null value.
+     * write a JSON entry with a null value (<code>isUseNativeNulls() == true</code>) 
+     * or ignore that map entry (<code>isUseNativeNulls() == false</code>).
      *
-     * @return The <code>javaNullAsJsonNull</code> configuration value.
+     * @return The <code>useNativeNulls</code> configuration value.
      */
-    public boolean isJavaNullAsJsonNull() {
+    public boolean isUseNativeNulls() {
-        return this.javaNullAsJsonNull;
+        return this.useNativeNulls;
     }
     
 

src/test/java/org/json/junit/JSONArrayTest.java

@@ -235,7 +235,7 @@ public class JSONArrayTest {
         Map<String, Object> sub = new HashMap<String, Object>();
         sub.put("nullKey", null);	
         list.add(sub);
-        JSONParserConfiguration parserConfiguration = new JSONParserConfiguration().withJavaNullAsJsonNull(true);
+        JSONParserConfiguration parserConfiguration = new JSONParserConfiguration().withUseNativeNulls(true);
         JSONArray jsonArray = new JSONArray(list, parserConfiguration);
         JSONObject subObject = jsonArray.getJSONObject(0);
         assertTrue(subObject.has("nullKey"));

src/test/java/org/json/junit/JSONObjectTest.java

@@ -627,7 +627,7 @@ public class JSONObjectTest {
         assertTrue("expected null value to be ignored by default", obj1.isEmpty());
 
         // if configured, null values are written as such into the JSONObject.
-        JSONParserConfiguration parserConfiguration = new JSONParserConfiguration().withJavaNullAsJsonNull(true);
+        JSONParserConfiguration parserConfiguration = new JSONParserConfiguration().withUseNativeNulls(true);
         JSONObject obj2 = new JSONObject(map, parserConfiguration);
         assertFalse("expected null value to accepted when configured", obj2.isEmpty());
         assertTrue(obj2.has("nullKey"));
@@ -644,7 +644,7 @@ public class JSONObjectTest {
         nestedList.add(nestedMap);        
         map.put("nestedList", nestedList);
         
-        JSONParserConfiguration parserConfiguration = new JSONParserConfiguration().withJavaNullAsJsonNull(true);
+        JSONParserConfiguration parserConfiguration = new JSONParserConfiguration().withUseNativeNulls(true);
         JSONObject jsonObject = new JSONObject(map, parserConfiguration);
 
         JSONObject nestedObject = jsonObject.getJSONObject("nestedMap");