Java Maps and Hashmaps

Question

Anonymous · Accepted Answer

import java.util.*;
public class GetDuplicates {
	public static void main(String args[]){
		// get input 
		Scanner sc = new Scanner(System.in);
		ArrayList nums = new ArrayList();

		while(sc.hasNext()) {
			String num = sc.next().trim();
			if (num.equals("q")) break;
			nums.add(Integer.parseInt(num));
		}

		Set set = new HashSet();

		for(int n : nums) {
			if(set.contains(n)) {
				System.out.print(n + " ");
			}
			else {
				set.add(n);
			}
		}
	}
}

Anonymous · Answer

Implement a way of iterating through an array of integers and returning only duplicate values within the array, wasn't able to answer this one but did give me a hint abut using hashmaps to do it

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