java 查看对象内存占用大小

1、POM 依赖

<dependency><groupId>com.carrotsearch</groupId><artifactId>java-sizeof</artifactId><version>0.0.5</version></dependency>

/2、java 代码通过RamUsageEstimator 查看内存占用大小

String str = "xxx";T object = JSONObject.parseObject(str, T.class);byte[] bytes = ProtostuffRuntimeUtil.serialize(object);long l = RamUsageEstimator.sizeOf(object);long bytesL = RamUsageEstimator.sizeOf(bytes);System.out.println("object:" + l + ",bytes:" + bytesL);