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import java.util.*;  
public class Main {  
    public static void main(String[] args) {  
      Scanner sc = new Scanner(System.in);
      System.out.println("Enter the size of array: ");
      int n = sc.nextInt();
      int arr[] = new int[n];
      System.out.println("Enter " +n+ " array elements ");
      for(int i=0; i<n; i++) {
         arr[i] = sc.nextInt();
      }
      Arrays.sort(arr);
      for(int i=n-1;i>1;i--){
        if(arr[i]!=arr[i-1]){
            System.out.println(arr[i-1]+" is second largest element");
            break;
        }
    }
    
  }
}    

Output

Enter the size of array: 
6
Enter 6 array elements 
33
33
32
4
12
3
32 is second largest element