Detailed explanation of how to remove duplicate values ​​from an array in Java

You can use the set method, because the set method itself does not allow duplicate values ​​

The code is as follows:

public static void main(String[] args) {
        int[] a={1,1,1,1,1,1,2,2,2,2,2,2,2,3,3,3,3,3,3,3};
        System.out.println(Arrays.toString(a));
        Set<Integer> set=new HashSet<Integer>();
        for (Integer integer : a) {
            set.add(integer);
        }
        Integer[] b=set.toArray(new Integer[0]);
        System.out.println(Arrays.toString(b));
    }

Of course, you can also use this method to remove duplicate numbers in the list

public static void main(String[] args) {
        List<Integer> list=Arrays.asList(1,2,3,1,2,3,4,5,6,4,5,6);
        Set set=new HashSet<Integer>(list);
        list=new ArrayList<Integer>(set);
        System.out.println(list);
    }

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