The method index This lists the methods which can be used by someone who employs the class in Java

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The method index This lists the methods which can be used by someone who employs the class
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within his or her applet or application The current Java documentation gives the types of the parameters, the name of the method, its access status and a brief description of what it does It is important to point out that some of the classes found within the Java library are abstract classes: classes which have place holder methods which do not implement any code (for an explanation of such abstract methods see 5) A good example of such a method within the util package is the class Dictionary This class is inherited by the class Hashtable to produce a class which is not abstract It is also important to point out that quite a large number of classes store objects which are described by the class Object This means that they can store a wide variety of objects as described in 5 Another important point to make is that the description of the methods within the Java class library often reference the exceptions which will be raised whenever an error condition occurs such as an attempt to store a value within a data structure when that data structure is full 621 The Vector class This is one of the most useful classes in the util package; one which we find ourselves using quite a lot within applets or applications It describes objects which look like arrays in that they are indexable, but they differ from arrays in that they can extend themselves This means that if a Vector object finds itself running out of space it can request more space from the Java run-time system to extend itself It is important to point out that by describing the Vector class we are not elevating it in importance above other classes in the Java libraries, we are just using it as an example The Vector class is associated with three instance variables The first is capacityIncrement which specifies the increase in storage which will be added to a vector when it runs out of space If this instance variable is zero then the capacity of a Vector object is doubled when it runs out of space The second is elementCount which contains the number of elements in the vector The third is elementData which is an array where the items in the Vector object are stored There are three constructor methods associated with vectors Vector with two int arguments sets up an empty vector with the first parameter holding the number of items that the vector is assumed to hold and the second parameter specifying the increase in size when the vector becomes full Vector with one argument sets up an empty vector with the sole argument specifying the initial capacity of the vector This constructor sets the capacityIncrement instance variable to zero, ensuring that the capacity of a Vector object is doubled whenever it runs out of space The final constructor is Vector without any arguments The size of the vector is set to a system-defined default with any Vector objects instantiated in this way doubling their size when they run out of capacity Thus: Vector smallQ = new Vector(20, 3), largeQ = new Vector(), medQ = new Vector(1100); declares three Vector identifiers It declares the first vector smallQ to initially contain 20 elements with the size of the object being incremented by 3 whenever it runs out of space It declares the Vector largeQ to contain the system default of the number of items initially assumed to be held in the vector and assumes the vector s size will be doubled whenever it runs out of space The final declaration in-
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forms the Java system that the vector medQ will initially contain 1100 elements and will be doubled in size whenever it runs out of space There are a large number of methods associated with Vector objects The aim of this section is not to detail all of them but to briefly describe a small number in order to give you a flavour of the sort of facilities a data structure class will provide within the Java system
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