JVM、Java虛擬機，Java內存模型，調優等

1、jdk、jre、jvm三者的關係 jdk  Java Deployment Kit Jre  Java Runtime Environment jvm Java Virtual Machine 2、內存溢出 OutOfMemoryError:Java heap space Main ---> VM arguments: -XX:+HeapDumpOnOutOfMemoryError -Xms2

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