java虚拟机开始学习

chenzhuo@picooc.com · chenzhuo@picooc.com · commit fe0d48470ab9 · 2019-01-03T23:27:04.000+08:00
diff --git a/src/main/java/com/sun/jvm/Jvm/finalize/FinalizeEscapeGC.java b/src/main/java/com/sun/jvm/Jvm/finalize/FinalizeEscapeGC.java
@@ -5,6 +5,8 @@
  * @Despacito TODO
  * @Author chenzhuo
  * @Version 1.0
+ *
+ *
  * Finalize&#23548;&#33268;gc&#22833;&#25928;
  * finalize &#25918;&#22312; finalize-Queue&#20013; &#22312;&#19968;&#20010;&#20302;&#32423;&#30340;&#32447;&#31243;&#20013;&#25191;&#34892;
  * finalize() &#21482;&#33021;&#34987;&#25191;&#34892;&#19968;&#27425;
diff --git a/src/main/java/com/sun/jvm/Jvm/gcRoots/GCRootTest.java b/src/main/java/com/sun/jvm/Jvm/gcRoots/GCRootTest.java
@@ -80,6 +80,8 @@ public static void main(String[] args) {
          *  Metaspace       used 3223K, capacity 4500K, committed 4864K, reserved 1056768K
          *   class space    used 349K, capacity 388K, committed 512K, reserved 1048576K
          */
+        //&#27809;&#26377;&#35774;&#32622;&#20026;null&#30340;&#26102;&#20505;,&#22238;&#25910;&#30340;&#26102;&#20505;&#20250;&#36941;&#21382;next&#30340;&#25152;&#20197;&#33410;&#28857;,&#25152;&#20197;&#20250;&#24456;&#32791;&#26102;&#38388;
+        //&#20294;&#26159;&#25226;next&#30340;set&#20026;null&#30340;&#26102;&#20505; &#23601;&#21464;&#20026;&#19981;&#21487;&#36798;&#29366;&#24577;
        // next = null; help gc
         triggerGC();
     }

-Original file line number
+Diff line change
  * @Despacito TODO
  * @Author chenzhuo
  * @Version 1.0
 + *
 + *
  * Finalize导致gc失效
  * finalize 放在 finalize-Queue中 在一个低级的线程中执行
  * finalize() 只能被执行一次
Original file line number	Diff line number	Diff line change
`@@ -80,6 +80,8 @@ public static void main(String[] args) {`
`80`	`80`	`* Metaspace used 3223K, capacity 4500K, committed 4864K, reserved 1056768K`
`81`	`81`	`* class space used 349K, capacity 388K, committed 512K, reserved 1048576K`
`82`	`82`	`*/`
	`83`	`+ //没有设置为null的时候,回收的时候会遍历next的所以节点,所以会很耗时间`
	`84`	`+ //但是把next的set为null的时候就变为不可达状态`
`83`	`85`	`// next = null; help gc`
`84`	`86`	`triggerGC();`
`85`	`87`	`}`