How to efficiently (performance) remove many items from List in Java?

Question

I have quite large List named items (>= 1,000,000 items) and some condition denoted by that selects items to be deleted and is true for many (maybe hal

Answer 1

Use Apache Commons Collections. Specifically this function. This is implemented in essentially the same way that people are suggesting that you implement it (i.e. create a new list and then add to it).