JButton Appearance

Normally, you don't need to use the ActionEvent parameter that is passed to the listener -- it's enough to know that the button was clicked. However, you can find out things such as the time to button was clicked, or which modifier keys were pressed, if you need them. You can also get a special code that you associated with that button if you need it.

Dynamically changing a button

btn.setText("someText");
btn.setIcon(anIcon);

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java.util.StringTokenizer

Java: java.util.StringTokenizer

Purpose

Constructors

StringTokenizer st = new StringTokenizer(s);

Creates a StringTokenizer for the String s that uses whitespace (blanks, tabs, newlines, returns, form feeds) as delimiters.

StringTokenizer st = new StringTokenizer(s, d);

Creates a StringTokenizer for the String s using delimiters from the String d.

StringTokenizer st = new StringTokenizer(s, d, f);

Creates a StringTokenizer for the String s using delimiters from the String d. If the boolean f is true, each delimiter character will also be returned as a token.

Common Methods

• st.hasMoreTokens() -- Returns true if there are more tokens.
• st.nextToken() -- Returns the next token as a String.
• st.countTokens() -- Returns the int number of tokens. This can be used to allocate an array before starting, altho it can be inefficient for long strings because it has to scan the string once just to get this number. Using a Vector and converting it to an array at the end may be a better choice.

Example: Find the longest word in a String

// Assume s contains a string of words
String longestWord = "";
StringTokenizer st = new StringTokenizer(s, " ,	");
while (st.hasMoreTokens()) {
    String w = st.nextToken();
    if (w.length() > longestWord.length()) {
        longestWord = w;
    }
}

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