By Fintan Culwin
This article introduces the coed to the foremost wigets and protocols of the JFC, supplying a enough knowing in order that extra complicated amenities may be approached. superb for a moment direction in Java, it's going to permit scholars to construct on a few familiarity with using item orientated layout and improvement in Java to effectively engineer interfaces.
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Extra resources for A Java Foundation Classes Primer
It is possible, when a large font is selected, that this area will not be large enough for the entire image to be seen, and scroll bars are supplied for when this is the case. In the left-hand illustration the area is high enough to show all four lines, so no vertical scroll bar is required. However, the window is not wide enough to show the extent of all the lines, so a horizontal scroll bar is supplied. 2. The illustration shows that the width of the area upon which the font is being illustrated is much wider than the width of the viewport that is being used to look at it; only approximately the middle half of the image can be seen.
This is a user interface design principle known as closure. Every action by users should be confirmed to them in some way, so that they can be certain that the action has been attended to and they can continue with the next action. Once they are experienced with the interface, and have confidence in its correct operation, they may no longer fully attend to the changes, and may even initiate the next action before the previous action has been confirmed. However, if they experience difficulties they will slow down and attend to the feedback provided.
It is shown as implementing the ActionListener interface, as it has to listen to the ActionEvents from the JButton instance on theInterface. It is also shown as implementing the ItemListener interface as it has to listen to ItemEvents generated by the three JComboBoxes on the interface. 5 FontViewer artifact: instance diagram. role of supplying information concerning which fonts are available in the environment and also constructing and supplying the Font requested by the user. The presentation level object, theInterface, shown on the left, is an instance of the FontViewerUI class which extends the JPanel class.