Write A Java Program That Reads A File, Displays The File On Screen With Line

Contents

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
1. FileInputStream fil;
2. LineNumberInputStream line;
3. int i;
Create try block
1. fil = new FileInputStream(args[0]);
2. line = new LineNumberInputStream( file );
Catch( FileNotFoundException e )
Print No such file found

Inside do
read line i = line.read();
Use if condition
1. if( i == ‘n’)
  1. System.out.print(line.getLineNumber()+” “);
2. Else: System.out.print((char)i);

Use while loop:
1. while(i!=-1);
  1. fil.close();
  2. line.close();

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 ] );
 }
 }

Write a Java program that reads a file and displays the file on the screen with a line number before each line

Java program that reads a file and displays the file on the screen with a line number before each line

Aim:

Algorithm:

Source Code:

Input:

Output:

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