Line Number Reader Example
In this example we are reading
number of lines.
In this example we are reading a file
from system .Then we are reading number of lines in this file. FileReader
class provides readLine() method.The readLine()
method is used to read the data line by line. LineNumberReader class
is provide getLineNumber() method to get the number of line. We are
using File(String file_name) constructor to make an object of
file. We are reading file by use of FileReader(File file) constructor.
We are using LineNumberReader(FileReader filereader) constructor
to create an object of LineNumberReader class.
The methods used in this example:
getLineNumber():
This method is used to get the number of line.
readLine():
This method is used to read the data line by line. Then returns the data
of a line as a single string.
The code of the program is given below:
import java.io.*;
public class LineNumberReaderExample{
public static void main(String[] args) throws Exception{
File file = null;
FileReader freader = null;
LineNumberReader lnreader = null;
try{
file = new File("LineNumberReaderExample.java");
freader = new FileReader(file);
lnreader = new LineNumberReader(freader);
String line = "";
while ((line = lnreader.readLine()) != null){
System.out.println("Line: " + lnreader.
getLineNumber() + ": " + line);
}
}
finally{
freader.close();
lnreader.close();
}
}
}
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The output of the program is given below:
C:\convert\rajesh\completed>javac LineNumberReaderExample.java
C:\convert\rajesh\completed>java LineNumberReaderExample
Line: 1: import java.io.*;
Line: 2: public class LineNumberReaderExample{
Line: 3: public static void main(String[] args)
throws Exception{
Line: 4: File file = null;
Line: 5: FileReader freader = null;
Line: 6: LineNumberReader lnreader = null;
Line: 7: try{
Line: 8: file = new File("
LineNumberReaderExample.java");
Line: 9: freader = new FileReader(file);
Line: 10: lnreader = new
LineNumberReader(freader);
Line: 11: String line = "";
Line: 12: while ((line =
lnreader.readLine()) != null){
Line: 13: System.out.
println("Line: " + lnreader.
getLineNumber() + ": " + line);
Line: 14: }
Line: 15: }
Line: 16: finally{
Line: 17: freader.close();
Line: 18: lnreader.close();
Line: 19: }
Line: 20: }
Line: 21: }
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Download this
example.
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