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Creating More Wrapper Objects
Some of the wrapper classes have a second constructor that takes a String as an argument and tries to convert to the appropriate type. For example: Double d = new Double ("3.14159"); The type conversion process is not very robust. For example, if the Strings are not in the right format, they will cause a NumberFormatException. Any non-numeric character in the String, including a space, will cause the conversion to fail. Integer i = new Integer ("17.1"); // WRONG!!Double d = new Double ("3.1459 "); // WRONG!! It is usually a good idea to check the format of the String before you try to convert it.
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Last Update: 2011-01-24