Each component that goes into gridbag layout has to be tagged with a gridbagconstraint object that carries number of parameters.These parameters are used for positioning, sizing and padding in grid bag layout.
For your information GridBagConstraints public GridBagConstraints(int gridx, int gridy, int gridwidth, int gridheight, double weightx, double weighty, int anchor, int fill, Insets insets, int ipadx, int ipady) Creates a GridBagConstraints object with all of its fields set to the passed-in arguments. Note: Because the use of this constructor hinders readability of source code, this constructor should only be used by automatic source code generation tools. Parameters: gridx - The initial gridx value. gridy - The initial gridy value. gridwidth - The initial gridwidth value. gridheight - The initial gridheight value. weightx - The initial weightx value. weighty - The initial weighty value. anchor - The initial anchor value. fill - The initial fill value. insets - The initial insets value. ipadx - The initial ipadx value. ipady - The initial ipady value. can be used to position components in GridBagLayout HTH tvs sundaram