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REMOVING elements from list b that are present in the list a - Lists - Java
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Java - Lists - Removing elements from list b that are present in the list a
Removing elements from list B that are present in the list A

Lets suppose you have 2 Lists A and B, and you want to remove from B all the elements that you have in A the method in this case is


List.removeAll(Collection c);

#Example:

public static void main(String[] args) {
    List<Integer> numbersA = new ArrayList<>();
    List<Integer> numbersB = new ArrayList<>();
    numbersA.addAll(Arrays.asList(new Integer[] { 1, 3, 4, 7, 5, 2 }));
    numbersB.addAll(Arrays.asList(new Integer[] { 13, 32, 533, 3, 4, 2 }));
    System.out.println("A: " + numbersA);
    System.out.println("B: " + numbersB);

    numbersB.removeAll(numbersA);
    System.out.println("B cleared: " + numbersB);
    }

this will print

A: [1, 3, 4, 7, 5, 2] B: [13, 32, 533, 3, 4, 2] B cleared: [13, 32, 533]

 
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