Java Program to find a duplicate number in an array.

package logics;

public class findDuplicate {
public static void main(String []args)
{
    int arr[]=new int[]{1,2,3,4,5,6,7,8,1,8};
    duplicate(arr);
}

public static void duplicate(int a[])
{
    for(int i=0;i<a.length;i++)
    {
        for(int j=i+1;j<a.length;j++)
        {
            if( (i!=j) &&  a[i]==a[j])
                System.out.printf("duplicate is %d \n",a[i]);
        }
    }
}
}//class

output:
-------------------
duplicate is 1
duplicate is 8