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 { 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
