获取对象占用内存

	org.apache.lucene
	lucene-core
	4.0.0

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--add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.nio=ALL-UNNAMED --add-opens java.base/sun.nio.ch=ALL-UNNAMED
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public static void main(String[] args) throws Exception {
	List list = new ArrayList<>() ;
	for (int i = 0; i < 1000000; i++) {
		list.add(new ChannelUserDTO()) ;
	}
	log.info("size 2: {}", RamUsageEstimator.humanSizeOf(list));
}
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