Configuring the JTextField
The JTextField is added first (lines 41–45). The weightx and weighty values are set to 1. The fill variable is set to BOTH. Line 44 specifies that the JTextField is the last component on the line. The JTextField is added to the content pane with a call to our utility method addComponent (declared at lines 79–83). Method addComponent takes a Component argument and uses GridBagLayout method setConstraints to set the constraints for the Component. Method add attaches the component to the content pane.
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