By Kingston J.H. (ed.)
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Extra resources for An Introduction to Computer Programming with Java
0": "B", "1": "a", "2": "t", "3": "m", "4": "a", "5": "n"} With this in mind, we can query characters in "Batman" numerically with the  operator. Try doing so in Firebug, verifying your work with Figure 2–5: "Batman"; // "m" "Batman"; // "B" Figure 2–5. Querying elements in a wrapper object String wrappers have a length member equal to the number of elements. That is to say, length is equal to the number of characters in the string. Try querying length for the Incredibles and a few of their supervillains.
They innately have extraordinary powers, referred to as members or methods. On the other hand, values of the string, number, or boolean type are like Iron Man or Batman in that they need to put on their costume, referred to as a wrapper, to have extraordinary powers. So, just as seeing the bat signal appear in the night sky over Gotham City tells Bruce Wayne to put on the bat suit in order to become Batman, seeing the . operator appear to their right tells a string, number, or boolean to put on a wrapper in order to become an object.