Floating Point Formatting Applet

Classic programmed-learning exercises, refreshed for modern Java and presented in the current MrStyner.com portfolio style.

Modern Java noteThis archive has been refreshed for Java 25 LTS. Core language concepts remain useful, while outdated setup instructions and browser-era Java are labeled or replaced. Java 26 is the current feature release; Java 25 is used here as the stable teaching baseline.
Historical topic: Java appletsModern web browsers do not run Java applets. The Applet API was deprecated for removal before Java 25 and was removed in Java 26. Treat applet examples on this page as historical object-oriented/GUI examples; for new desktop interfaces use Swing where appropriate or JavaFX/OpenJFX.
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Answer:

No. The bits in value provide data for format() when it creates a string of characters, but the bits in value are not changed. (The rounding only affects the characters, not the value.)

Floating Point Formatting Applet

Here is an applet that formats a double using DecimalFormat.format(). Enter a floating point number (as characters) into the text box and click on the button.

Embedded Java applet removed: modern browsers do not support Java applets. The surrounding source code is retained for historical study.

If you enter characters that can't be converted into a double, an error message will be written. If you want to see lots of zeros, enter something like 1E21. Enter 1E999 and see what happens. Experiment a bit with rounding. Enter 1.999999999 and see what happens.

QUESTION 6:

What happens when 1.999999999 is displayed?

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