Short-Circuit Logical Operator!!!

[Brian Smith]

hi,
what are the particular situatios that short-circuit logical operator (|| and &&) is used against other logical operators(| and &)? please help me with it.
thanks.

[Michael Morris]

Originally posted by Namaste Sathi:
hi,
what are the particular situatios that short-circuit logical operator (|| and &&) is used against other logical operators(| and &)? please help me with it.
thanks.

The short circuit operators can save you from things like NullPointerExceptions and can cause a statement to only be evaluated if both operands are tested. For example:

    if (obj != null && obj.hashCode() == someInt) {
        // Do something with obj
    }

That will save you from a runtime exception because if obj is null then obj.hashCode() will not be called which would result in a NullPointerException being thrown. Also consider this:

    if ((a = a + b) == 6 || ((c = c + 3) == 9) {
        // Do some fancy programming
    }

If the result of a + b is 6 then the statement c = c + 3 will not be evaluated so in that case c would not change.