The File class operates on files and directories
CreateNewFile create file
Mkdir mkdirs create file
Exists to determine whether a file or folder exists
Length gets the file length
LastModified Time
GetName gets the name of the file or folder
GetPath relative path
Absolute path of getAbsoultPath
Runtime Exception
ArithmeticmeticException
Abnormal ArrayIndexOutOfBoundsException array index of crossing the line
NullPointerException NullPointerException
Type cast exception ClassCastException
Illegal parameter exception IllegalArgumentException
Index overbounds Exception IndexOfBoundsException
Checked Exceptions are non-runtime exceptions
I/O exception IOException
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