Published 04 Sep, 2022

Java - How to get the number of characters in a JTextField?

Category Java
Modified : Oct 02, 2022
45

Is there a event on how to count the inputted character in a JTextField?

Answers

There are 3 suggested solutions here and each one has been listed below with a detailed description. The following topics have been covered briefly such as Java, Character, Swing, Jtextfield. These have been categorized in sections for a clear and precise explanation.

4

You can use the method getText() inherited from JTextComponent to retrieve the current string value of your field (depending on your context, be prepared for NullPointerExceptions).

And then you can ask that string for the number of characters; using String.length() to return the number of Unicode code points in that string.

If you are interested in counting words inside that string, you can use String.split() in order to have that one string sliced into an array of sub-elements of it (for example using " " as argument, or "\s+" which splits on any wildcard).


35
       String s = " ";
        char c = s.charAt(0);
 public static int countOccurrences(String haystack, char c)
        {
            int count = 1;
            for (int i=0; i < haystack.length(); i++)
            {
                if (haystack.charAt(i) == c)
                {
                     count++;
                }
            }
            return count;
        }

30

To get the text from your text field, call getText() on it. This will give you a String object with the text from the text field in it.

From there, if you want to get the number of characters in your text field, you can call the length() method on the String from the text field. string.length();.

If you want the number of words, use string.split(" ").length;, where string is the string from your text field object. This will split the string into a string array with each new word as an element of the string and then count how many elements there are.