What are temporary object in java programming?

Answer 1

A temporary object is also known as an automatic object. These are objects that are created automatically during a compound computation according to operator precedence. For instance, a = b + c * 42 is composed of several operations each of which must be evaluated separately. Multiplication takes precedence over addition which takes precedence over assignment, thus the complete operation is evaluated as follows:

a = (b + (c * 42))

c * 42 is evaluated first as it has the highest precedence. This creates a temporary object storing the result of that operation. The object has no name (it is anonymous), but let's refer to it by the name t1. This leads us to the second part of the evaluation:

b + t1

This creates another temporary object, which we'll refer to as t2. At this point t1 immediately falls from scope (because it was temporary). Finally, we perform the last part of the evaluation:

a = t2

At this point, the variable named a holds the final result of the operation and t2 falls from scope.