&& : Java Glossary

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&&
Performs a short circuit logical and, on two booleans. && is sometimes called the short circuit and operator or the McCarthy and operator. John McCarthy was one of the LISP (List Processing language) pioneers.

false && false → false
false && true → false
true && false → false
true && true →

The evaluation is guaranteed to proceed in strict left to right order and if any boolean is false, it does not evaluate any expressions to the right of

// if s is null, Java won't try to test the length of s
if ( s != null && s.length() > 0 )
    {
    out.println( "non empty string" );
    }

Learning More

JLS (Java Language Specification): expression evaluation order

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