|| : Java Glossary


Performs a short-circuit logical or, on two booleans. || is sometimes called the short circuit or operator or the McCarthy or operator. John McCarthy was one of the LISP (List Processing language) pioneers. The | character is created by hitting shift-\. Sometimes it is displayed with a small gap in the bar, sometimes not. It can be hard to tell apart from Il1! in some fonts.

false || falsefalse
false || truetrue
true || falsetrue
true || truetrue

The evaluation is guaranteed to proceed in strict left to right order and if any boolean is true, it does not evaluate any expressions to the right of
// if s is null, Java won't bother to test the length of s
if ( s == null || s.length() == 0 )
   out.println( "empty string" );

Learning More

This page is posted
on the web at:


Optional Replicator mirror
of mindprod.com
on local hard disk J:

Canadian Mind Products
Please the feedback from other visitors, or your own feedback about the site.
Contact Roedy. Please feel free to link to this page without explicit permission.

Your face IP:[]
You are visitor number