Java一个对象占用内存的大小查看

1.maven 导入相关依赖

<!-- https://mvnrepository.com/artifact/com.carrotsearch/java-sizeof -->
<dependency>
    <groupId>com.carrotsearch</groupId>
    <artifactId>java-sizeof</artifactId>
    <version>0.0.5</version>
</dependency>

　　

2.代码打印内存大小

log.info("RamUsageEstimator数据大小：{}", RamUsageEstimator.sizeOf(xxxxx));