Add explicit @nullable annotations to all type arguments inside org.j…

…son package, in order for J2KT to correctly infer nullability in types on the boundary between non-null-marked and null-marked scope.

PiperOrigin-RevId: 541739440

jre_emul/android/platform/libcore/json/src/main/java/org/json/JSONArray.java

@@ -50,13 +50,13 @@
 public class JSONArray {
 
     @UnsupportedAppUsage
-    private final List<Object> values;
+    private final List<@Nullable Object> values;
 
     /**
      * Creates a {@code JSONArray} with no values.
      */
     public JSONArray() {
-        values = new ArrayList<Object>();
+        values = new ArrayList<@Nullable Object>();
     }
 
     /**
@@ -118,7 +118,7 @@ public JSONArray(Object array) throws JSONException {
             throw new JSONException("Not a primitive array: " + array.getClass());
         }
         final int length = Array.getLength(array);
-        values = new ArrayList<Object>(length);
+        values = new ArrayList<@Nullable Object>(length);
         for (int i = 0; i < length; ++i) {
             put(JSONObject.wrap(Array.get(array, i)));
         }
@@ -292,7 +292,7 @@ public Object get(int index) throws JSONException {
             }
             return value;
         } catch (IndexOutOfBoundsException e) {
-            throw new JSONException("Index " + index + " out of range [0.." + values.size() + ")", e);
+      throw new JSONException("Index " + index + " out of range [0.." + values.size() + ")", e);
         }
     }
 

jre_emul/android/platform/libcore/json/src/main/java/org/json/JSONObject.java

@@ -117,13 +117,13 @@ public class JSONObject {
     };
 
     @UnsupportedAppUsage
-    private final LinkedHashMap<@NonNull String, Object> nameValuePairs;
+    private final LinkedHashMap<@NonNull String, @Nullable Object> nameValuePairs;
 
     /**
      * Creates a {@code JSONObject} with no name/value mappings.
      */
     public JSONObject() {
-        nameValuePairs = new LinkedHashMap<String, Object>();
+        nameValuePairs = new LinkedHashMap<@NonNull String, @Nullable Object>();
     }
 
     /**
@@ -689,7 +689,7 @@ public long optLong(@Nullable String name, long fallback) {
     @Nullable public JSONArray names() {
         return nameValuePairs.isEmpty()
                 ? null
-                : new JSONArray(new ArrayList<String>(nameValuePairs.keySet()));
+                : new JSONArray(new ArrayList<@Nullable String>(nameValuePairs.keySet()));
     }
 
     /**

jre_emul/android/platform/libcore/json/src/main/java/org/json/JSONStringer.java

@@ -114,7 +114,8 @@ enum Scope {
      * levels of nesting.
      */
     @UnsupportedAppUsage
-    private final List<Scope> stack = new ArrayList<Scope>();
+    private final List<@Nullable Scope> stack =
+        new ArrayList<@Nullable Scope>();
 
     /**
      * A string containing a full set of spaces for a single level of