1. java對象結(jié)構(gòu)查看-JOL
描述：openjdk提供的一個查看java對象的小工具
官網(wǎng)：jol官網(wǎng)鏈接
基本用法：
- 引入maven
<!-- https://mvnrepository.com/artifact/org.openjdk.jol/jol-core -->
<dependency>
<groupId>org.openjdk.jol</groupId>
<artifactId>jol-core</artifactId>
<version>0.10</version>
</dependency>
- 打印對象
public static void main(String[] args) {
Object obj = new Object();
System.out.println(ClassLayout.parseInstance(obj).toPrintable());
}
- 查看結(jié)果
java.lang.Object object internals:
OFFSET SIZE TYPE DESCRIPTION VALUE
0 4 (object header) 01 00 00 00 (00000001 00000000 00000000 00000000) (1)
4 4 (object header) 00 00 00 00 (00000000 00000000 00000000 00000000) (0)
8 4 (object header) 28 0f 96 16 (00101000 00001111 10010110 00010110) (378933032)
12 4 (loss due to the next object alignment)
Instance size: 16 bytes
Space losses: 0 bytes internal + 4 bytes external = 4 bytes total
（持續(xù)更新......）
