循环引用实例

chenweijie · chenweijie · commit b4975cceeb69 · 2018-10-24T09:27:38.000+08:00
diff --git a/src/main/java/com/chen/api/util/jvm/chapter3/ForEachReferenceDemo.java b/src/main/java/com/chen/api/util/jvm/chapter3/ForEachReferenceDemo.java
@@ -1,8 +1,37 @@
 package com.chen.api.util.jvm.chapter3;
 
 /**
+ * 循环引用的垃圾回收
+ *
  * @author :  chen weijie
  * @Date: 2018-10-24 9:20 AM
  */
 public class ForEachReferenceDemo {
+
+
+    public Object instance = null;
+    private static final int _1MB = 1024 * 1024;
+
+    //这个成员变量的唯一作用就是站点内存，一边在GC日志中可以看清楚是否被回收过
+
+    private byte[] bigSize = new byte[2 * _1MB];
+
+    public static void testGC() {
+
+        ForEachReferenceDemo objectA = new ForEachReferenceDemo();
+        ForEachReferenceDemo objectB = new ForEachReferenceDemo();
+        objectA.instance = objectA;
+        objectB.instance = objectB;
+        objectA = null;
+        objectB = null;
+        System.gc();
+
+
+    }
+
+    public static void main(String[] args) {
+        testGC();
+    }
+
+
 }
