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printf string formatting

O. Ziggy
Ranch Hand

Joined: Oct 02, 2005
Posts: 430

In the following program



The output is



Can someone please explain how a double value (i.e. 123.456) is converted to a boolean (ie. true)



Thanks
Henry Wong
author
Sheriff

Joined: Sep 28, 2004
Posts: 19064
    
  40


It's all explained, in the JavaDoc of the java.util.Formatter class, which is the class that is used to format the text.

Henry


Books: Java Threads, 3rd Edition, Jini in a Nutshell, and Java Gems (contributor)
O. Ziggy
Ranch Hand

Joined: Oct 02, 2005
Posts: 430

Yes i saw the description in the API.

If the argument arg is null, then the result is "false". If arg is a boolean or Boolean, then the result is the string returned by String.valueOf(arg). Otherwise, the result is "true".


It just seemed weird that any string can result in a value of true. For example, the following expression also prints true.

Paul Clapham
Bartender

Joined: Oct 14, 2005
Posts: 18987
    
    8

You're better off believing what the documentation says, rather than what your intuition says. For one thing that's how the JVM is actually going to work.
 
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subject: printf string formatting