Quick question about numbers and decimals

[camaro01]

Guys,

I completed a project for school but I am having a little problem formatting numbers.

I have the following line

JOptionPane.showMessageDialog(null, "Subtotal: " + subTotal);

The line and the code works but my problem is the result it yields has too many decimals. I tried the following line but it did not work:

JOptionPane.showMessageDialog(null, "Subtotal: %5.2f" , total);

I tried placing the %5.2f outside the parenthesis and it did not work.

Can someone help me fix this error?

[Junky]

You need to use the String.format method.

JOptionPane.showMessageDialog(null, "Subtotal: " + String.format(......, subTotal));

Or you can use the NumberFormat/DecimalFormat classes.

[camaro01]

I tried using the following String format but it gives me an error:

Shop.java:61: illegal start of expression
			JOptionPane.showMessageDialog(null, "Subtotal: " + String.format(%5.2f, subTotal));
			                                                                 ^
1 error

Any idea what I am doing wrong?

[toadaly]

String.format requires a String as the first argument. %5.2f is not a String, but "%5.2f" is.

[pbrockway2]

JOptionPane.showMessageDialog(null, "Subtotal: " + String.format([color=red][b]"%5.2f"[/b][/color], subTotal));

"%5.2f" is the format string.

[camaro01]

Got it working guys,

Thanks!