How to implement Stack Iteration using Java 8 Stream

Question

I have a Stack<Object> and following piece of code:

while(!stack.isEmpty()){
    Object object = stack.pop();
    // do some operation on object
}

How this iteration can be implemented using Java 8 Stream so that it loops until the stack is empty and in every iteration the stack should be reduce by popping one element from top?

Answer 1

In Java 9, there will be a 3-arg version of Stream.iterate (like a for loop -- initial value, lambda for determining end-of-input, lambda for determining next input) that could do this, though it would be a little strained:

if (!stack.isEmpty()) {
    Stream.iterate(stack.pop(), 
                   e -> !stack.isEmpty(), 
                   e -> stack.pop())
          ...
}