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JOL Java Object LayoutSergey Ponomarev Get Compatible with IntelliJ IDEA (Ultimate, Community), Android Studio and 2 moreFeedback Report Content Terms of Use Legal, Privacy and Security Copyright © 2000-2025 JetBrains s.r.o. Developed with drive and IntelliJ IDEA...
publicstaticvoidmain(String[]args){out.println(ClassLayout.parseClass(C.class).toPrintable());}publicstaticclassA{inta;}publicstaticclassBextendsA{intb;}publicstaticclassCextendsB{intc;} 输出结果: org.openjdk.jol.samples.JOLSample_04_Inheritance$C object internals: OFF SZ TYPE DESCRIPTION VALUE ...
publicstaticvoidmain(String[]args){finalAa=newA();ClassLayoutlayout=ClassLayout.parseInstance(a);out.println("*** Fresh object");out.println(layout.toPrintable());out.println("hashCode: "+Integer.toHexString(a.hashCode()));out.println();out.println("*** After identityHashC...
publicclassJavaObjectLayoutTest {publicstaticvoidmain(String[] args) { Object o=newChild(); System.out.println(ClassLayout.parseInstance(o).toPrintable()); o.hashCode(); System.out.println(o.hashCode()); System.out.println("对应十六进制表示:"+Integer.toHexString(o.hashCode())); ...
JOL(Java Object Layout)是Java提供的一个工具,能够让开发者检查对象的内存占用情况和布局。这一工具的主要目标是提供有关Java对象在内存中如何存储的详细信息,包括对象头、对齐填充、实例字段等。 JOL的基本原理 每个对象在内存中都有一个对象头,包含了关于对象的信息(如对象的哈希码、GC状态等)。JOL可以用来可视化...
JOL的全称是Java Object Layout。是一个用来分析JVM中Object布局的小工具。包括Object在内存中的占用情况,实例对象的引用情况等等。 JOL可以在代码中使用,也可以独立的以命令行中运行。命令行的我这里就不具体介绍了,今天主要讲解怎么在代码中使用JOL。 使用JOL需要添加maven依赖: ...
importorg.openjdk.jol.info.GraphLayout;importjava.util.HashMap;publicclassJolTest{publicstaticvoidmain(String[]args) {HashMap<Object,Object>hashMap=newHashMap<>();hashMap.put("key","value");System.out.println(GraphLayout.parseInstance(hashMap).toFootprint()); } } ...
JOL (Java Object Layout) is the tiny toolbox to analyze object layout in JVMs. These tools are using Unsafe, JVMTI, and Serviceability Agent (SA) heavily to decode the actual object layout, footprint, and references. This makes JOL much more accurate than other tools relying on heap dumps...
主要介绍了Java对象布局(JOL)实现过程解析,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下 java 对象布局 JOL2020-08-19 上传大小:583KB 所需:12积分/C币 JOL(JAVA OBJECT LAYOUT)工具0.9.zip 查看java对象内部构造 ...