??????????
??????????????????·??????б???/????б???????????????·???п??????'.'??????·????'..'??????·?????·???????????????
????Java
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???????磺ipconfig.exe?????·??????????C:??:C:WindowsSystem32ipconfig.exe??
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import java.io.*;
File file=newFile("c:\");        //·????????C?????
File file=nw File("c:");
File file=new File("c:/");
???????·??????????·????ο???????????????????????·??????????
???????磺?赱?·???C:Windows??????·??????д??  .System32ipconfig.exe??????'.'??????·????????????д?????д??System32ipconfig.exe??
?????????
import java.io.*;
File file=newFile(".");      //?????
File file=new File("..");    //??????????????
File file=new File("");    //????????