boolean b = c instanceof d;
// c is an object, d is a class or interface type
Often used for checking whether safe to cast, to avoid a ClassCastException when running:
Object [] mixture = new Object [] { "abc", new X (),
new Integer (10), ... };
for (int i = 0; i < mixture.length; i++)
{
if (mixture [i] instanceof String) // OK to cast
{
System.out.println ((String) mixture [i]);
}
}
(Remember that keywords are always all lower case, even though this one is made from 2 words.)