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?????????classpath?????????????????????????????HelloWorld.class????鵵?????jar?????????HelloWorld.jar????????????????????????Main.class??????????
??????????????classpath?????????HelloWorld.jar???????????C:hello?????2??????????????JAR????Main??á?????????????????????????
????????????????????????????????????μ?HelloWorld.class??Java ????????????????????????Java launcher??????????-classpath?????????????C:hello???????????????????????????????????????????? classpath????????????????????????????
?????????????????????????????????μ????JAR??Java launcher???????????HelloWorld.class????????????????classpath??????????????????????????????????????????????JRE???????????????????????????????е?????????????classpath????????????????μ???
?????????classpath???——???????????JAR?е???????.class?????JAR?????????.jar??β????????????????????? classpath????????μ?HelloWorld.jar???????HelloWorld.backup??????????????顣
??????????????????classpath?????????JAR????????.jar??β???????NoClassDefFoundError?????????е??????????????????????????????????????????μ?JAR???????????????????????к????????????????????????????????
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