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JRE 包含了 JVM, 和一些类库(util等)不包含debugger, compiler等
The Java Runtime Environment...JRE = JVM + Java Packages Classes(like util, math, lang, awt,swing etc)+runtime libraries....Java Runtime Environment contains JVM, class libraries, and other supporting files....Java Developer Kit contains tools needed to develop the Java programs, and JRE to run the programs....The tools include compiler (javac.exe), Java application launcher (java.exe), Appletviewer, etc…
Compiler