help please

[trixma]

I can't get hte message dialogs to appear in the JTextField if the number is typed incorrectly. for example if I type 256 the dialog should appear saying invalid range and it doesnt. What have I done wrong.

JButton calculate = new JButton("Calculate");

public void actionPerformed(ActionEvent event)
{
int f1 = Integer.parseInt(field1.getText());
int f2 = Integer.parseInt(field2.getText());
int f3 = Integer.parseInt(field3.getText());
int f4 = Integer.parseInt(field4.getText());
if (event.getSource() == calculate)
{

if (f2 < 0 && f2 > 255)
JOptionPane.showMessageDialog(frame, "Invalid Range!", "Error", JOptionPane.ERROR_MESSAGE);
if (f3 < 0 && f3 > 255)
JOptionPane.showMessageDialog(frame, "Invalid Range!", "Error", JOptionPane.ERROR_MESSAGE);
if (f4 < 0 && f4 > 255)
JOptionPane.showMessageDialog(frame, "Invalid Range!", "Error", JOptionPane.ERROR_MESSAGE);
}
}

[lionelBadiou]

Hi trixma,

Could you imagine a number < 0 and > 255 ? probably you can't

Your tests should be rebuilt like this: if (f2 <0 || f2 > 255) ...

Best regards,