find word occurence in string

[r bal]

Hi,

I am trying to write a program which returns the numbers of times a particular word is found in a String.

So far I have this code below...but it's definitely not working. Any help would be much appreciated. :-)


import javax.swing.*;

public class Sentence {

private static final char SPACE = ' ';

public static void main(String[] args) {

String inputSent, inputWord, error;
int count = 0;
int index = 0;
int numberOfCharacters;

inputSent = JOptionPane.showInputDialog(null, "Enter your sentence.");

inputWord = JOptionPane.showInputDialog(null,
"Enter the word you want to find in your sentence.");

numberOfCharacters = inputSent.length();

String space = " ";

while (index < numberOfCharacters) {
inputSent.indexOf(inputWord);
count++;
index++;

}

JOptionPane.showMessageDialog(null, "The word " + inputWord + " appears " + count + " times in the sentence " + "\n" + inputSent);

System.exit(0);

}

}

[Keith Lynn]

One problem I see is with your use of indexOf. indexOf will give you the
index of the first occurence of the word. You need to look at the other version of indexOf that will let you specify where to start looking.

[r bal]

Hi,

I have had another look at the API, and found....

"indexOf(int ch, int fromIndex)
Returns the index within this string of the first occurrence of the specified character, starting the search at the specified index."

So I changed that part of my code to:
while (index < numberOfCharacters) {
inputSent.indexOf(inputWord, index);
count++;
index++;

}

However, I keep getting the same results/errors.

[Nicholas Cheung]

You might need to have a check condition, rather than simply add the count.

int index = 0;
int numberOfCharacters = inputSent.length();
 
while (index < numberOfCharacters) {
  /* To find the next matched position */
  index = inputSent.indexOf(inputWord, index);
  if (index != -1) { /* Means there is a match */
    count++;
  }
}

Nick