如何通过JOL查看Java对象内存结构

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curl -L -O curl -L -O https://repo.maven.apache.org/maven2/org/openjdk/jol/jol-cli/0.9/jol-cli-0.9-full.jar
java -cp jol-cli-0.9-full.jar org.openjdk.jol.Main internals java.lang.String
java -cp jol-cli-0.9-full.jar org.openjdk.jol.Main internals java.lang.Integer