1 files changed, 56 insertions, 0 deletions
diff --git a/test/003-omnibus-opcodes/src/InternedString.java b/test/003-omnibus-opcodes/src/InternedString.java
new file mode 100644
index 0000000000..4baab0c384
--- /dev/null
+++ b/test/003-omnibus-opcodes/src/InternedString.java
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import java.lang.ref.*;
+
+public class InternedString {
+    public static final String CONST = "Class InternedString";
+
+    public static void run() {
+        System.out.println("InternedString.run");
+        testImmortalInternedString();
+        testDeadInternedString();
+    }
+
+    private static void testDeadInternedString() {
+        String s = "blah";
+        s = s + s;
+        WeakReference strRef = new WeakReference<String>(s.intern());
+        // Kill s, otherwise the string object is still accessible from root set
+        s = CONST;
+        System.gc();
+        // "blahblah" should disappear from the intern list
+        assert(strRef.get() == null);
+    }
+
+    private static void testImmortalInternedString() {
+        WeakReference strRef = new WeakReference<String>(CONST.intern());
+        System.gc();
+        // Class constant string should be entered to the interned table when
+        // loaded
+        assert(CONST == CONST.intern());
+        // and it should survive the gc
+        assert(strRef.get() != null);
+
+        String s = CONST;
+        // "Class InternedString" should remain on the intern list
+        strRef = new WeakReference<String>(s.intern());
+        // Kill s, otherwise the string object is still accessible from root set
+        s = "";
+        System.gc();
+        assert(strRef.get() == CONST);
+    }
+}