1 /*
2  * Copyright (C) 2017 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 import dalvik.system.VMRuntime;
18 import java.lang.ref.WeakReference;
19 import java.lang.reflect.Method;
20 
21 public class Main {
main(String[] args)22     public static void main(String[] args) {
23         try {
24             // Allocate a large object.
25             byte[] arr = new byte[128 * 1024];
26             // Allocate a non movable object.
27             byte[] arr2 = (byte[])VMRuntime.getRuntime().newNonMovableArray(Byte.TYPE, 200);
28             // Put the array in a weak reference so that IsMarked is called by the GC.
29             WeakReference weakRef = new WeakReference(arr2);
30             // Do a GC.
31             Runtime.getRuntime().gc();
32             arr[0] = 1;
33             arr2[0] = 1;
34             System.out.println(arr.length + " " + arr2.length + " " + (weakRef.get() != null));
35         } catch (Exception e) {
36             System.out.println(e);
37         }
38     }
39 }
40