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The Internet is a large group of interconnected networks All of these networks have agreed to connect with some other network, thus allowing everyone to connect to one another Each of these component networks is assigned a network address Traditionally, in a 32-bit IP address, the network component typically takes up 8, 16, or 24 bits to encode a class A, B, or C network, respectively Since the remainder of the bits in the IP address is used to enumerate the host within the network, the fewer bits that are used to describe the network, the more bits are available to enumerate the hosts For example, class A networks have 24 bits left for the host component, which means there can be upward of 16,777,214 hosts within that network (Classes B and C have 65,534 and 254 nodes, respectively)

Here is the output generated by the CardLayoutDemo applet Each card is activated by pushing its button You can also cycle through the cards by clicking the mouse

Although the preceding layouts are perfectly acceptable for many uses, some situations will require that you take a bit more control over how the components are arranged A good way to do this is to use a grid bag layout, which is specified by the GridBagLayout class What makes the grid bag useful is that you can specify the relative placement of components by specifying their positions within cells inside a grid The key to the grid bag is that each component can be a different size, and each row in the grid can have a different number of columns This is why the layout is called a grid bag It s a collection of small grids joined together The location and size of each component in a grid bag are determined by a set of constraints linked to it The constraints are contained in an object of type GridBagConstraints Constraints include the height and width of a cell, and the placement of a component, its alignment, and its anchor point within the cell The general procedure for using a grid bag is to first create a new GridBagLayout object and to make it the current layout manager Then, set the constraints that apply to each component that will be added to the grid bag Finally, add the components to the layout

11:

24:

manager Although GridBagLayout is a bit more complicated than the other layout managers, it is still quite easy to use once you understand how it works GridBagLayout defines only one constructor, which is shown here: GridBagLayout( ) GridBagLayout defines several methods, of which many are protected and not for general use There is one method, however, that you must use: setConstraints( ) It is shown here: void setConstraints(Component comp, GridBagConstraints cons) Here, comp is the component for which the constraints specified by cons apply This method sets the constraints that apply to each component in the grid bag The key to successfully using GridBagLayout is the proper setting of the constraints, which are stored in a GridBagConstraints object GridBagConstraints defines several fields that you can set to govern the size, placement, and spacing of a component These are shown in Table 24-1 Several are described in greater detail in the following discussion

NOTE There are also class D and class E ranges Class D is used for multicast, and class E is reserved for experimental use To better organize the various classes of networks, it was decided early in IP s life that the first few bits would decide to which class the address belonged For the sake of readability, the first octet of the IP address specifies the class NOTE An octet is eight bits, which in the typical dotted-decimal notation of IP means the number before a dot For example, in the IP address 192168142, the first octet is 192, the second octet is 168, and so on The ranges are as follows: Class A B C Octet Range 0 126 128 192167 192169 223