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Additional resources for Java Phrasebook (Developer's Library)

Sample text

String comparison is a common source of bugs for novice Java programmers. A novice programmer will often attempt to compare strings using the comparison operator ==. When used with Strings, the comparison operator == compares object references, not the contents of the object. Because of this, two string objects that contain the same string data, but are physically distinct string object instances, will not compare as equal when using the comparison operator. This is the preferred string comparison behavior in most string comparison cases.

ToString(); The StringBuffer class contains a reverse() method that returns a StringBuffer that contains the characters from the original StringBuffer reversed. A StringBuffer is easily converted into a String using the toString() method of the StringBuffer. So by temporarily making use of a StringBuffer, you are able to produce a second string with the characters of an original string in reverse order. 5, you can use the class instead of the StringBuffer class. The StringBuilder class will give you faster performance, but its methods are not synchronized; thus it is not thread-safe.

GetInstance(); This will produce a Calendar object, cal, initialized with the current date and time. getTime(); If you’re working with times and dates, you’ll often find it necessary to convert between java Date and Calendar objects. Fortunately, as shown in the phrase, this is a very simple thing to do. Date object. In most Java applications, you’ll find uses of both the Date and Calendar classes; thus knowing how to convert from one to the other is something you want to be familiar with. I’d recommend that you create utility methods to perform these conversions so that you can convert from any place in your code with a simple method call.

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