高校幫java課堂筆記1601文件類file

1、知識點：文件類——FileFile類執(zhí)行操作的時候一publicFile(StringpublicFile(StringpublicFile(FilepublicFile(Fileparent,StringpublicpublicbooleancreateNewFile()throwspublicpublicbooleanpublicbooleanpublicbooleanpackagepackageimportpublicclassTestDemopublicstaticvoidmain(String[]args)ExceptionFilefile=newFile("c:\\test.txt")if(file.exists())filefile.delete()}{;}}第二個問題：關于操作系統(tǒng)的路徑分隔符問題。在windows之中使用的路徑分割符：\，而在linuxpublicstaticfinalpublicstaticfinalStringpackageimportpackageimportpublicclassTestDemopublicstaticvoidmain(String[]args)ExceptionFilefile=newFile("c:"+File.separator+if{}else}}} publicbooleanpublicboolean publicpublicFile packagepackageimportpublicclassTestDemopublicstaticvoidmain(String[]args)ExceptionFilefile=newFile("c:"+File.separator+"my"+File.separator+"demo"+File.separator++o"if(!file.getParentFile().existsfilefile.getParentFile().mkdirs錄}if{}{;}}}File類取得文件夾之中的內容。publicpublicbooleanpackageimportpublicpackageimportpublicclassTestDemopublicstaticvoidmain(String[]args)ExceptionpublicFile[]FileFilefile=newFile("c:"+File.separator+"ProgramFiles");if(file.exists()&&{Fileresult[]=file.listFiles()for(intx=0;x<result.length;x{}}}}publicpubliclongpackageimportpackageimportimportimportpublicclassTestDemopubliclongpublicpublicstaticvoidmain(String[]args)ExceptionFilefile=newFile("d:"+File.separator++newBigDecimal((file.length()/(double