Stack forEach expression to loop for difference between existing size and new one [closed]

I have a class with data member:

private static final int DEFAULT_SIZE = 10;
private Stack<String> myStack = new Stack<>();

// want to add more element to the stack based on demand - but add incremental demand

public void addCapacity(int incremental) {
    int diff = incremental - DEFAULT_SIZE;
    myStack.forEach((diff) -> {
        myStack.push("something");
    });
}

The idea was to see if this forms a use case for lambda functions. But it will not allow me as it is expecting a boolean in place of diff. Is lambda forEach a use-case here?

Answer

Since Stack extends Vector, if you wanted to increase the capacity, then you could have used ensureCapacity (in Vector)

myStack.ensureCapacity(minCapacity);

If you wanted to do myStack.push("something") diff times, then you could have used:

IntStream.range(0, diff).forEach(i -> myStack.push("something"));