Grid Layout

• Arranges components in a grid with a fixed number of rows and columns
• Resizes each component so that they all have same size
• Expands each component to fill the entire allotted area
• Add the components, row by row, left to right:

  JPanel numberPanel = new JPanel();
  numberPanel.setLayout(new GridLayout(4, 3));
  numberPanel.add(button7);
  numberPanel.add(button8);
  numberPanel.add(button9);
  numberPanel.add(button4);
  . . .