Java一個對象占用內存的大小查看

1.maven 導入相關依賴

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

　　

2.代碼打印內存大小

log.info("RamUsageEstimator數據大小：{}", RamUsageEstimator.sizeOf(xxxxx));