Loading, saving and displaying text - An Introduction to Graphical User Interfaces with Java Swing - page 98

61.
62.

// writes 40 characters from the buffer

63.

// starting at position 7 of the buffer

64.
65. fw.write(buffer,7,40);

66.
67.

// close file

68.

fw.close();

69.
70. }// if

71.

else

72.

{

73.

System.out.println("File not created "+writefile.getName());

74.

}

75. }

76. catch (Exception ex)

77. {

78. System.out.println("Problem opening file "+writefile.getName());

79. }

80. }
81.
82. public static void main(String[] args)
83.

{

84.

FileReadWrite RWF = new FileReadWrite("testtext1.txt","testtext2.txt");

85.

}

86. }

10.1.4 Reading text files line by line

Sometimes one would like to access a text file line by line. To do this another
reader is used, a BufferedReader .Welist the constructor and some methods:
BufferedReader(FilerReader fReader)

close()
String readLine()

BufferedReader(FilerReader fReader) constructs a buffered reader. A file
reader is given as argument.

close() stops the buffered reader and closes the file.
readLine() returns a single line of text or null if the end of the stream has been
reached. The line-end characters are not returned.

The following program LineRead reads a file line-wise. The while loop is terminated
when the string read is null , i.e., when the file end is reached.