I have just written this code for calculating the perimeter and area of Rectangle, i was able to compile it but still couldn't run it, could anyone please help me have a look at it.
these go together public class periArea extends JFrame { Container pane = getContentPane(); pane.add(row1); pane.add(row2); pane.add(row3);
and these go together JFrame frame; frame.setTitle("Area and Perimeter"); frame.setSize(400,400); frame.setDefaultCloseOperation(EXIT_ON_CLOSE); frame.setVisible(true);
the two are not the same JFrame - you should be able to work out the fix.
when fixed, your next question will be "only row3 shows" - JFrame's default LayoutManager is BorderLayout - read the apidocs for BorderLayout to see how multiple components should be added.
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