Question

How to remove duplicate values from int array in Java

Answer 1

import java.util.Set;
import java.util.HashSet;

public class MyClass {
    public static Set<Integer> removeDuplicates(int arr[]) {
        Set<Integer> set = new HashSet<Integer>();

        int len = arr.length;
        for (int i = 0; i < len; i++) {
            set.add(arr[i]);
        }
        
        return set;
    }
    public static void main(String args[]) {
        int arr[] = { 1, 2, 1, 4, 5, 6, 4, 4, 9, 8, 8, 8, 8, 1, 3, 1 };
 
        Set<Integer> set = removeDuplicates(arr);
        
        for (Integer num : set) {
            System.out.println(num);
        }
    }
}



/*
run:

1
2
3
4
5
6
8
9

*/

 

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Answer 2

import java.util.Arrays;

public class MyClass {
    public static void main(String args[]) {
        int arr[] = { 1, 2, 1, 4, 5, 6, 4, 4, 9, 8, 8, 8, 8, 1, 3, 1 };
        
        System.out.println(arr.getClass().getComponentType());

        arr = Arrays.stream(arr).distinct().toArray();

        System.out.println(arr.getClass().getComponentType());

        
        int len = arr.length;
        for (int i = 0; i < len; i++)
            System.out.print(arr[i] + " ");
    }
}




/*
run:

1
2
3
4
5
6
8
9

*/

 

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