Java program that reads a file and displays the file on the screen with a line number before each line
Aim:
To write a Java program that reads a file and displays the file on the screen with a line number before each line.
Algorithm:
- import java package
- Create class Linenum
- Create main function
- public static void main( String[] args)throws IOException
- FileInputStream fil;
- LineNumberInputStream line;
- int i;
- Create try block
- fil = new FileInputStream(args[0]);
- line = new LineNumberInputStream( file );
- Catch( FileNotFoundException e )
- Print No such file found
- Inside do
- read line i = line.read();
- Use if condition
- if( i == ‘n’)
- System.out.print(line.getLineNumber()+” “);
- Else: System.out.print((char)i);
- if( i == ‘n’)
- Use while loop:
- while(i!=-1);
- fil.close();
- line.close();
- while(i!=-1);
Source Code:
import java.io.*;
class linenum
{
public static void main(String[] args)throws IOException
{
FileInputStream fil;
LineNumberInputStream line;
int i;
try
{
fil=new FileInputStream(args[0]);
line=new LineNumberInputStream(fil);
}
catch(FileNotFoundException e)
{
System.out.println("No such file found");
return;
}
do
{
i=line.read();
if(i=='n')
{
System.out.println();
System.out.print(line.getLineNumber()+" ");
}
else
System.out.print((char)i);
}while(i!=-1);
fil.close();
line.close();
}
}
Input:
This is file as input:Demo.java
class Demo
{
public static void main(java Demo beta gamma delta)
{
int n = 1 ;
System.out.println(“The word is ” + args[ n ] );
}
}
Output:
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