Answers for "count no of duplicate numbers in an array in java"

java find duplicates in array

// Uses a set, which does not allow duplicates 

for (String name : names) 
{
     if (set.add(name) == false) 
     {
        // print name your duplicate element
     }
}

Find out duplicate number between 1 to n numbers in java

public class Main{ public static void main(String[] args){ int [] arr = new int [] {10,34,56,67,10,56,3}; System.out.println("Duplicate elements are "); for(int i = 0; i < arr.length; i++) { for(int j = i + 1; j < arr.length; j++) { if(arr[i] == arr[j]) System.out.println(arr[j]); } } } }