fix issue #3880 (#3881)

jujn · wenshao · commit c8582b5150e4 · 2025-12-26T09:20:01.000+08:00
* fix issue #3880 * update JSONArray
diff --git a/core/src/main/java/com/alibaba/fastjson2/JSONArray.java b/core/src/main/java/com/alibaba/fastjson2/JSONArray.java
@@ -227,10 +227,22 @@ public JSONObject getJSONObject(int index) {
      * @throws IndexOutOfBoundsException if the index is out of range {@code (index < 0 || index >= size())}
      */
     public String getString(int index) {
+        return getString(index, null);
+    }
+
+    /**
+     * Returns the {@link String} at the specified location in this {@link JSONArray}.
+     *
+     * @param index index of the element to return
+     * @param defaultValue the default mapping of the index
+     * @return {@link String} or null
+     * @throws IndexOutOfBoundsException if the index is out of range {@code (index < 0 || index >= size())}
+     */
+    public String getString(int index, String defaultValue) {
         Object value = get(index);
 
         if (value == null) {
-            return null;
+            return defaultValue;
         }
 
         if (value instanceof String) {
diff --git a/core/src/main/java/com/alibaba/fastjson2/JSONObject.java b/core/src/main/java/com/alibaba/fastjson2/JSONObject.java
@@ -325,18 +325,28 @@ public JSONObject getJSONObject(String key) {
 
         return null;
     }
-
     /**
      * Returns the {@link String} of the associated keys in this {@link JSONObject}.
      *
      * @param key the key whose associated value is to be returned
      * @return {@link String} or null
      */
     public String getString(String key) {
+        return getString(key, null);
+    }
+
+    /**
+     * Returns the {@link String} of the associated keys in this {@link JSONObject}.
+     *
+     * @param key the key whose associated value is to be returned
+     * @param defaultValue the default mapping of the key
+     * @return {@link String} or null
+     */
+    public String getString(String key, String defaultValue) {
         Object value = super.get(key);
 
         if (value == null) {
-            return null;
+            return defaultValue;
         }
 
         if (value instanceof String) {
