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‎JdkLearn/src/main/java/com/learnjava/reference/WeakReferenceTest.java‎
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‎JdkLearn/src/main/java/com/learnjava/reference/WeakReferenceTest.java‎
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+34Lines changed: 34 additions & 0 deletions
@@ -0,0 +1,34 @@
+package com.learnjava.reference;
+
+import java.lang.ref.Reference;
+import java.lang.ref.ReferenceQueue;
+import java.lang.ref.WeakReference;
+
+public class WeakReferenceTest {
+    public static void main(String[] args) throws Exception {
+        test02();
+    }
+
+    private static void test02() throws InterruptedException {
+        ReferenceQueue refQueue = new ReferenceQueue();
+
+        // 10 mb
+        byte[] buffer = new byte[1024 * 1024 * 10];
+        WeakReference weakReference = new WeakReference(buffer, refQueue);
+        // 失去强引用关联
+        buffer = null;
+
+        Reference ref0 = refQueue.poll();
+        System.out.println("gc 执行之前， refQueue中是否有数据？" + (ref0 != null ? "有" : "没有"));
+        System.out.println("gc 执行之前, ref引用的对象：" + weakReference.get());
+
+        System.gc();
+        // 确保gc程序执行
+        Thread.sleep(1000);
+
+        System.out.println("gc 执行之前， ref引用的对象：" + weakReference.get());
+
+        Reference ref = refQueue.poll();
+        System.out.println("referenceQueue 中获取的 ref与 weakReference中的是否一致？" + (ref == weakReference));
+    }
+}