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Java String Programs - Part 1 WBUT : MCA 5th Semister - Java - 2009
File Handling In Java - Examples - Java
4334    Arnab De    31/07/2017

File Handling in JAVA

We can handle normal text file in java. For that, we must import java.io package. and create an object of the File class. This object can determine if a file exists or not. If exists, then we can easily do any thing with that file in the following example we find and count the occurrence of a pattern in a file. For that, we must create a file called test.txt in any directory [Here we put in in the same directory of the java file] and put some text in it.

text file
Test.txt

Write a program that takes a file name and a search string from the user. If the search string occurs in the file, then it counts the number of occurrences of the string. ( Assume that search pattern can exist more than two times in a line ). [WBUT MCA JAVA 2011]

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import java.util.*;
import java.io.*;
public class FileSearch
{
public static void main(String []args)
{
Scanner sc=new Scanner(System.in);
System.out.print("Enter a File Name : ");
String fname=sc.nextLine();
System.out.print("Enter a Word : ");
String word=sc.nextLine();
int count=0;
try
{
File f=new File(fname);
if(f.exists())
{
BufferedReader br = new BufferedReader(new FileReader(f));
String line;
String []words;
int i;
while ((line = br.readLine()) != null)
{
words=line.split(" ");
for(i=0;i<words.length;i++)
{
if(words[i].equals(word))
{
count++;
}
}
}
System.out.print("Frequency of the word \"" + word + "\" in the file " + fname + " are " + count);
}
else
{
System.out.print("File Not Found");
}
}
catch(Exception e)
{
System.out.print(e.toString());
}
}
}
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Output:

Enter a File Name : test.txt
Enter a Word : You
Frequency of the word "You" in the file test.txt are 3

marked text file
Test.txt
Java String Programs - Part 1 WBUT : MCA 5th Semister - Java - 2009
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Author Details
Arnab De
I have over 16 years of experience working as an IT professional, ranging from teaching at my own institute to being a computer faculty at different leading institute across Kolkata. I also work as a web developer and designer, having worked for renowned companies and brand. Through tutorialathome, I wish to share my years of knowledge with the readers.
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