Program

To count the number of lines, words and characters in a file.

Algorithm

Step 1: Start
Step 2: Initialize variables words, lines chars to 0
Step 3: Call count(InputStreamReader)
Step 4: Print lines, words, chars
Step 5: Stop

Function public Static Void count(InputStreamReader isr)

Step 1: Start
Step 2: Initialise FileInputStream pointer infile
Step 3: Read fname
Step 4: Initialise FileOutputStream pointer outfile and open file in output mode
Step 5: Read input and write it to file using outfile
Step 6: Close file
Step 7: Open file using infile in input mode
Step 8: Repeat steps 9-17 reading each character c until end of file
Step 9: char=char+1
Step 10: if(c==’\n’) go to step 11 else to18
Step 11: lines=lines+1
Step 12: index=ws.indexOf(c)
Step 13: if(index==-1) go to 14 else to 17
Step 14: if(set) then go to 13 else to 16
Step 15: words=words+1
Step 16: set=false go to 18
Step 17: set=true
Step 18: l=lines+words
Step 19: chars=chars-l
Step 20: Exit.

Program

import java.io.*;
import java.util.StringTokenizer;

class ProcessFile
{
	long words,lines,chars;
	File fn;
	FileInputStream in;
	DataInputStream ins;
	ProcessFile(String fname)
	{
		words=lines=chars=0;
		fn= new File(fname);
	}

	void Process()
	{
		int ch;
		String s,tok=" \t\n",temp;
		StringTokenizer st;
		try 
		{
			in=new FileInputStream(fn);
			ins=new DataInputStream(in);
			chars=fn.length();
			while(ins.available()!=0)
			{
				s=ins.readLine();
				lines++;
				st=new StringTokenizer(s,tok);
				words=words+st.countTokens();
			}
		} 
		catch (Exception e) 
		{
			System.out.println(e);
			System.exit(0);
		}
	}

	void PrintDetails()
	{
		if(fn.exists())
		{
			System.out.println("The " + fn.getAbsolutePath() + " contains.");
			System.out.println("Lines = " + lines);
			System.out.println("Words = " + words);
			System.out.println("Characters = " + chars);
		}
		else
		{
System.out.println("The file " + fn.getAbsolutePath() + " does not exit.");
		}
	}
}

public class MyWord
{
	public static void main(String args[]) 
	{
		String fname;
		DataInputStream in=new DataInputStream(System.in);
		System.out.println("Enter the filename : ");
		try
		{
			fname=in.readLine();
			ProcessFile pf=new ProcessFile(fname);
			pf.Process();
			pf.PrintDetails();
		}
		catch(Exception e)
		{
			System.out.println(e);
		}
		
	}
}

Output

Enter the filename :
c:\a.txt
The c:\a.txt contains.
Lines = 4
Words = 10
Characters = 30

File Processing in Java is a post from ShoutToWorld - Let's Learn Let's Shout - Helping bloggers and developers.