By Timothy M. O'Brien
This assortment presents professional information for utilizing the utilities of the Java-based Jakarta Commons open resource undertaking. you do not have to be knowledgeable, the book's solution-based layout includes code examples for a large choice of net, XML, community, trying out, and alertness tasks. with a view to tips on how to use Jakarta Commons utilities to create strong Java functions and instruments, the Jakarta Commons Cookbook is for you.
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Example text
Don't play around with null avoid it, test your system exhaustively, and throw an IllegalArgumentException. Consider the following method, which takes a latitude, longitude, and mode parameter. Both the latitude and longitude must fall within a valid range, and this method should throw an IllegalArgumentException if it encounters an unrealistic latitude, an unrealistic longitude, or an empty mode parameter. The Validate utility used in conjunction with a DoubleRange object can reduce the amount of code dedicated to range checking and method parameter validation.
5 has added a feature called autoboxing, which provides for automatic conversions between primitives and objects. html. 11 Finding Items in an Array Problem You need to test an array to see if it contains an element. If the array contains the element, you need the index of the matching element. lastIndexOf( ) to find the position of a matching element. println( "Array contains 'Blue'? println( "Index of 'Red'? println( "Last Index of 'Red'? " + lastIndexOfRed ); This example locates strings in a string array and produces the following output: Array contains 'Blue'?
Example 1-18 demonstrates the use of Validate to perform a few simple validations. Example 1-18. noNullElements( param3, "param3 cannot contain null elements" ); // do something complex and interesting } Discussion Write finicky methods. Don't just work with any input, have some standards. Don't hang around with garbage or nulls clean up your act, and use Validate. Methods in Validate throw an IllegalArgumentException if invalid parameters are encountered. isTrue( ) takes a logical expression that must evaluate to true.