JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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Program: Write a program to get distinct word list from the given file.


Description:

Write a program to find all distinct words from the given file. Remove special chars like ".,;:" etc. Ignore case sensitivity.


Code:
package com.java2novice.algos;

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.util.StringTokenizer;

public class MyDistinctFileWords {

	public List<String> getDistinctWordList(String fileName){

		FileInputStream fis = null;
		DataInputStream dis = null;
		BufferedReader br = null;
		List<String> wordList = new ArrayList<String>();
		try {
			fis = new FileInputStream(fileName);
			dis = new DataInputStream(fis);
			br = new BufferedReader(new InputStreamReader(dis));
			String line = null;
			while((line = br.readLine()) != null){
				StringTokenizer st = new StringTokenizer(line, " ,.;:\"");
				while(st.hasMoreTokens()){
					String tmp = st.nextToken().toLowerCase();
					if(!wordList.contains(tmp)){
						wordList.add(tmp);
					}
				}
			}
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally{
			try{if(br != null) br.close();}catch(Exception ex){}
		}
		return wordList;
	}
	
	public static void main(String a[]){
		
		MyDistinctFileWords distFw = new MyDistinctFileWords();
		List<String> wordList = distFw.getDistinctWordList("C:/sample.txt");
		for(String str:wordList){
			System.out.println(str);
		}
	}
}

Output:
the
while
statement
verifies
condition
before
entering
into
loop
to
see
whether
next
iteration
should
occur
or
not
do-while
executes
first
without
checking
it
after
finishing
each
will
always
execute
body
of
a
at
least
once
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Knowledge Centre
Can interface be final?
No. We can not instantiate interfaces, so in order to make interfaces useful we must create subclasses. The final keyword makes a class unable to be extended.
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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