Question

How to remove duplicates from int array in Java

Answer 1

import java.util.*;

public class MyClass {
    static void removeDuplicatesFromArray(int[] arr) {
        Set<Integer> set = new LinkedHashSet<Integer>();
        for (int i = 0;i < arr.length;i++) {
            set.add(arr[i]);
        }
        for (int i = 0;i < arr.length;i++) 
            arr[i] = 0;;
        
        int i = 0;
		for (Integer n: set)
			arr[i++] = n;
    }

    public static void main(String args[]) {
        int[] arr = {1, 2, 3, 2, 1, 4, 5, 5, 6};

        removeDuplicatesFromArray(arr);
        
        for (int i = 0; i < arr.length; i++)
            System.out.println(arr[i]);
    }
}


/*
run:

1
2
3
4
5
6
0
0
0

*/

 

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