ArrayList in java

) / * Output ;
[0, ArrayList, Arrays, Break, BufferedReader, BufferedWriter, Clean,
PrintWriter, Read, Regular, RuntimeException, Simple, Static, String,
Str[ngBui[der, System, TextFi]e, Tools, TreeSet, w, Write]

rea d ( ) appends each li ne to a St r i ngB u i I der, fol lowed by a newl ine, because that is
Then it returns a String containing the whole file. write( )
stripped out dur
opens and writes the text String to the file.

Notice that any code that ope
guarantee that the file

a file guards the file's close( ) call in a finally clause to
properly closed.

The constructor uses the read( ) method to turn the file into a Str
String.split( ) to divide the result into lines along newline bou
a lot, you may want to rewrite this constructor to imp
corresponding 'join ' method, so the non-static wri
hand.

then uses
(ifyou use this class
efficiency). Alas, there is no
) method mustwrite the lines out by

Because this class is intended to triv
the process of reading and writing files, all
IOExce
meExceptions, so the user doesn't have to use try-
are converted to R u I
catch blocks. However, you may need to create another version that passes 10 E xceptions
out to the caller.

In ma in( ), a basic test is performed to ensure that the methods work.

Although this utility did not require much code to create, using it can save a lot of time and
make your life easier, as you'll see in some of the examples later in this chapter.

Another way to solve the problem of read
introduced in Java SE5. However, this is onl)
tool (which you'll nob
is nor in java.io) is prir
language scanners or 'little languages.'

text files is to use the java.util.Scan her class
I files, not writing them, and that
creating programming-

Exercise 17: (4) Using TextFile and a Map(Character,Integers, create a program
that counts the occurrence of all the different characters in a file. (So if there are 12
occurrences of the letter 'a ' in the file, the Integer associated with the C ha racter
containing 'a ' in the Map contains '12').

E xercise 18: (1) Modify TextFI le.java so that it passes 10 Exceptions out to the caller.

Reading binary files

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