File comparison program - Language Basics Source Code in Java

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Home » Java Home » Language Basics Home » File comparison program

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Title	File comparison program
Author	Dilli Babu
Author Email	i_am_dil6 [at] yahoo.co.in,dillibabu.c [at] gmail.com
Description	The program will prompt for 2 file names(.txt) that are to be compared. Given the file names, this program will compare the two files. If any difference is there, it will print the differences and no. of differences in command prompt. If no difference is there, it will print "files are equal".
Category	Java » Language Basics
Hits	393939
Code	Select and Copy the Code
import java.io.; import java.util.; public class myfilereader { public static void main (String[] args) throws java.io.IOException { //Getting the name of the files to be compared. BufferedReader br2 = new BufferedReader (new InputStreamReader(System.in)); System.out.println("Enter 1st File name:"); String str = br2.readLine(); System.out.println("Enter 2nd File name:"); String str1 = br2.readLine(); String s1=""; String s2="",s3="",s4=""; String y="",z=""; //Reading the contents of the files BufferedReader br = new BufferedReader (new FileReader (str)); BufferedReader br1 = new BufferedReader (new FileReader (str1)); while((z=br1.readLine())!=null) s3+=z; while((y=br.readLine())!=null) s1+=y; System.out.println (); //String tokenizing int numTokens = 0; StringTokenizer st = new StringTokenizer (s1); String[] a = new String[10000]; for(int l=0;l<10000;l++) {a[l]="";} int i=0; while (st.hasMoreTokens()) { s2 = st.nextToken(); a[i]=s2; i++; numTokens++; } int numTokens1 = 0; StringTokenizer st1 = new StringTokenizer (s3); String[] b = new String[10000]; for(int k=0;k<10000;k++) {b[k]="";} int j=0; while (st1.hasMoreTokens()) { s4 = st1.nextToken(); b[j]=s4; j++; numTokens1++; } //comparing the contents of the files and printing the differences, if any. int x=0; for(int m=0;m<a.length;m++) { if(a[m].equals(b[m])){} else { x++; System.out.println(a[m] + " -- " +b[m]); System.out.println();} } System.out.println("No. of differences : " + x); if(x>0){System.out.println("Files are not equal");} else{System.out.println("Files are equal. No difference found");} } }

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