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±äÁ¿Öµ: .;%JAVA_HOME%\lib\tools.jar;%JAVA_HOME%\lib\dt.jar;
3¡¢±äÁ¿Ãû£º JAVA_HOME
±äÁ¿Öµ£º C:\jdk1.6.0
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FileInputStream fis=null;
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System.out.println("File has "+ fis.available() + " bytes"); ......
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