What does pack do

Question

I am learning about JPanel and GridLayout   this snippet of code  will produce a simple JPanel with 6 buttons  package testing    import java io    import java util    import java security    import javax xml bind DatatypeConverter  import java lang    import java awt    import javax swing     public class Testing         public static class GridPanel extends JPanel                public GridPanel                         setLayout new GridLayout 2 3                setBackground Color GREEN               this setPreferredSize new Dimension 500 500                 JButton b1   new JButton   Button 1                JButton b2   new JButton   Button 2                JButton b3   new JButton   Button 3                JButton b4   new JButton   Button 4                JButton b5   new JButton   Button 5                JButton b6   new JButton   Button 6                 add b1               add b2               add b3               add b4               add b5               add b6                           public static void main String   args                 GridPanel gp   new GridPanel           JFrame jf   new JFrame           jf add gp          jf pack      code wouldnt work if i comment out this line        jf setVisible true               I am wondering why my code wouldnt work if i comment out jf pack

User · Answer

The pack method sizes the frame so that all its contents are at or above their preferred sizes  An alternative to pack is to establish a frame size explicitly by calling setSize or setBounds  which also sets the frame location   In general  using pack is preferable to calling setSize  since pack leaves the frame layout manager in charge of the frame size  and layout managers are good at adjusting to platform dependencies and other factors that affect component size  From Java tutorial You should also refer to Javadocs any time you need additional information on any Java API

User · Answer

The pack   method is defined in Window class in Java and it sizes the frame so that all its contents are at or above their preferred sizes

[java] What does .pack() do?

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