[macrophyllum]

I am a beginner programmer writing a Java app that does matrix math and displays float values in NSTextFields. I was wondering how one sets the number of decimals displayed. I would like the NSTextFields to display only 1 or 2 decimals (e.g. 456.23). Can anyone help me out?

Thank you.

[AirSluf]

A different but related question, to add.

Is there any way to get the Java3D API classes in for either OS9 or X? I have a Prof who has us using this for the matrix and vector methods. I am also having the same precision issues and my Java class isn't until next quarter.

[eyadams]

There may be a way in IB to configure the text field for the behavior you want, but you could also use a java.text.DecimalFormat, like this

DecimalFrom df = new DecimalFormat("$##,###,##0.00;$-##,###,##0.00");
System.out.println(df.format(12345.6789); // outputs "$12,345.68"
System.out.println(df.format(12345)); // outputs "$12,345"

[macrophyllum]

Thank you! One last question. Do you know how to display large floats in a format similar to: 2.33E34 (i.e. 2.33 x 10^34)?

[eyadams]

java.text.DecimalFormat to the rescue again:

> java.text.DecimalFormat df = new java.text.DecimalFormat("#0.##E0");
> System.out.println(df.format(12345.6789)); // outputs "1.235E4"
> System.out.println(df.format(12345)); // outputs "1.234E4"

The java.text. * Format classes are pretty flexible; they're part of the standard JDK and have been around for quite a while.

[macrophyllum]

Wow! Thank you! It works great now.

Originally posted by eyadams:
java.text.DecimalFormat to the rescue again:

> java.text.DecimalFormat df = new java.text.DecimalFormat("#0.##E0");
> System.out.println(df.format(12345.6789)); // outputs "1.235E4"
> System.out.println(df.format(12345)); // outputs "1.234E4"

The java.text. * Format classes are pretty flexible; they're part of the standard JDK and have been around for quite a while.