By default, the lines are left justified. Center the lines.

   
import javax.swing.JButton;

public class Main {
  public static void main(String[] argv) throws Exception {
    JButton component = new JButton();
    component.setToolTipText("<html><center>" + "This is a" + "<br>" + "tool tip"
        + "</center></html>");
  }
}

1.	Tooltip Sample
2.	Html tooltips
3.	Working with Tooltip Text
4.	MultiLine ToolTip Example
5.	Colored ToolTip Example
6.	Disable / enable application tool tips
7.	Making Tool Tips Remain Visible
8.	Enabling and Disabling Tool Tips
9.	Making Tool Tips Appear Immediately
10.	Use the default tool tip location
11.	Make a tool tips appear immediately
12.	Showing an Image in a Tool Tip with HTML
13.	Setting a Tool Tip
14.	Setting the Location of a Tool Tip
15.	Set the location of the tool tip such that its nw corner coincides with the bottom center of the button
16.	Showing an Image in a ToolTip
17.	Modify the behaviour of the default JToolTip
18.	Italicize the second line
19.	Changing ToolTip background color for Swing Applications
20.	ToolTip Location Example
21.	Set a tool tip for swing component
22.	JToolTip With Icon

By default, the lines are left justified. Center the lines. : Tooltip « Swing JFC « Java

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