(For more about JavaScript Object Notation, see InfoWorld’s primer, What is JSON?.) The JSON object is useful all the time. Here’s an example ... of methods that can be used with strings.

Good programmers need to create code that efficiently solves problems, using various methods. A popular academic exercise is to create a program that determines if a number or String is a palindrome.

Every character in the String is counted. In the above example ... method, or else a NullPointer runtime exception results. There are many scenarios where a program must first find the length of a ...