By Adam Freeman, Darrel Ince
Covers the most rules in the back of the language and gives an intensive creation to new ideas and concerns linked to utilizing Java. Illustrated all through with examples. Paper.
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Extra resources for Active Java: Object-Oriented Programming for the World Wide Web
Personnel systems often have information about the car that a current member of staff drives. This information is used for a wide variety of purposes, from finding out who has misparked the car in the company car park to determining whether a new car is needed for a member of staff. Given this further complication we need another class which will contain instance variables connected with the car an employee runs, for example the make of the car and the date when the car was assigned to the member of staff.
There is a char data type called char in the Java language. This uses the 16 bit Unicode character set with characters being denoted by the value enclosed within single quotes. Thus: char senseChar, ringChar = 'e'; declares two character variables senseChar and ringChar, with the second of these variables being initialized to contain the character e. There is a Boolean data type known as boolean. Variables of this type can hold either the value true or the value false. Thus, boolean loopSensor, pollSensor = true; declares the Boolean variables loopSensor and pollSensor and sets the second of these to the value true.
These are String and StringBuffer. Objects described by the former are constants which cannot be changed, while objects described by the latter can be modified. Normally Java code involves strings being converted into StringBuffers, modified and then reconverted into strings. There are a number of ways of creating Strings and StringBuffers. The first is to declare them using the normal declaration facility that you have seen previously. For example, the declaration: String filename, rootDirectory; StringBuffer userName; declares two strings called filename and rootDirectory and a StringBuffer called userName.