awt

I realize most of the Java code to overwritten paint or paintComponent, most of them doesn't restore the old state of graphics object, after they had change the state of graphics object. For example, setStroke, setRenderingHint... I was wondering whether it is a good practice that we restore back the old state of graphics object, before returning from the method. For example public void paintComponent(Graphics g) { super.paintComponet(g); Stroke oldStroke = g.getStroke(); g.setStroke(newStroke); // Do drawing operation. g.setStroke(oldStroke); } Is this a good practice? Or it is over done? You

I am trying to implement a JScrollPane with a JTextArea. The JTextArea is being appended to, and I want the JScrollPane to keep scrolling down as more text is added. How can this be achieved? camickr For (what I think is) a simpler answer check out: Text Area Scrolling . Prior to JDK5, you would have to manually change the caret's position after each append. You can now give this behaviour as a default like this : JTextArea textArea = new JTextArea(); DefaultCaret caret = (DefaultCaret)textArea.getCaret(); caret.setUpdatePolicy(DefaultCaret.ALWAYS_UPDATE); The advantage of this is that you don

I'm trying to differentiate between listeners and adapters. Are they pretty much the same but in listeners you have to implement all the methods in the interface, but with adapters you have an option to only implement the methods you need so the code is cleaners and easier to read? I also got told that adapters enable instantiation with only one implementation and you can't instantiate listeners, I don't fully understand this. Can someone please explain which one is better to use and things you can do with one but you can't with the other? WindowListener is interface which force you to