Mido :
I want to get the difference between two lists. And this is what I am doing.
oldList = [1,1,2,2,3,3,4,4]
newList = [1,2,3,5]
List<Integer> add = new ArrayList<>(newList);
List<Integer> remove = new ArrayList<>(oldList);
add.removeAll(oldList);
remove.removeAll(newList);
The result I want
add = [5]
remove = [1,2,3,4,4]
But removeAll() remove all duplicate element. The results that I received
add = [5]
remove = [4,4]
How do I get the add and remove list? Thanks.
SomeGuy :
You're going to have to write some of your own code. This can't be done using only the Java Collection libraries alone.
import java.util.ArrayList;
public class MyList<T> extends ArrayList<T>{
public MyList(){
super();
}
public void specialRemoveAll(T[] list) {
for (T element : list) {
remove(element); // This only removes the first entry that matches 'element', not all matches
}
}
}
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