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What are the differences between a JScrollBar and a JScrollPane in Java? A JScrollBar is a component and it doesn't handle its own events whereas a JScrollPane is a Container and it handles its own events and performs its own scrolling.
It is scrollpane's vertical scrollbar child. It is the display policy for the vertical scrollbar.
Calling setCaretPosition(0) on your text component will cause it to scroll to the top.
Just in case you are not using a text component take a look at the thread posted here.... Setting Scroll Bar on a JScrollPane
Their solution is to spin off a thread via invokeLater
final JScrollPane scroll = new JScrollPane(text);
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
scroll.getVerticalScrollBar().setValue(0);
}
});
This will make the work:
DefaultCaret caret = (DefaultCaret) textArea.getCaret();
caret.setUpdatePolicy(DefaultCaret.NEVER_UPDATE);
You can use the method setCaretPosition(0) just after setText(String t) of your text component.
Use JComponent.scrollRectToVisible()
If you need more info, here's an article
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