100 Java Mistakes and How to Avoid Them by Tagir Valeev

Author:Tagir Valeev [Tagir Valeev<br><i>Foreword by Cay Horstmann</i>]
Language: eng
Format: epub
ISBN: 9781633437968
Publisher: Manning Publications Co.
Published: 2024-04-02T00:00:00+00:00

Similar things happen when you want to abbreviate text that is too long using the substring() call:

String abbreviated = longText.substring(0, 100) + "...";

Again, this may cause a visual glitch right before the ellipsis.

The java.lang.Character class provides several methods, like isDigit() and isLetter(), to test whether a character belongs to a particular class. These methods are usually overloaded: one version accepts a char parameter, while another accepts an int, which is a codepoint. It’s recommended to use int methods; as with char methods, you cannot correctly process characters outside of the BMP. For example, assume you want to write a method to check whether a given string starts with a digit. It can be written like this:

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