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DuplicationInArray.java

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package _03;

import java.util.HashSet;

import java.util.Set;

public class DuplicationInArray {

public static int getDuplication(int[] data) {

if (data == null || data.length < 2) {

return -1;

}

Set<Integer> set = new HashSet<>();

for (int item : data) {

if (set.contains(item)) {

return item;

}

set.add(item);

}

return -1;

}

public static void main(String[] args) {

int[] data = {2,3,1,0,2,5,3};

System.out.println(getDuplication(data));

}

}