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import java.lang.*;
 
class CalDifference{
 
	public static void main(String[] k){
 
	int n, sumOfSq, sqOfSums, diff;
	int[] num; 
	int[] numSq;	
 
	Scanner sc = new Scanner(System.in);
 
	System.out.println("Enter the num of Elements to be entered");
	n = sc.nextInt();
 
	num = new int[n];
	numSq = new int[n];
 
	inputElements(num,n);
	sqOfElememnts(num,numsq,n);
	sumOfSq  = sum(numSq,n) * sum(numSq,n);
	sqOfSums = sum(num,n) * sum(num,n);	
	diff     = sumOfSq - sqOfSums;
 
	}
 
	public static void inputElements(int[] a, int n){
 
		Scanner sc = new Scanner(System.in);
 
		for(int i=0 ; i<n ; i++)
		{
		a[i] = sc.nextInt();
		}
	}
 
	public static void sqOfElements(int[] a,int[] aSq, int n){
 
	Scanner sc = new Scanner(System.in);
 
		for(int i=0 ; i<n ; i++)
		{
		aSq[i] = a[i] * a[i];
		}
	}
 
	public static int sum(int[] a, int n){
 
	int sum = 0;
 
		for(int i=0 ; i<n ; i++)
		{
		sum = sum + a[i];
		}
	}
}
 
 

Main.java:11: cannot find symbol
symbol  : class Scanner
location: class CalDifference
	Scanner sc = new Scanner(System.in);
	^
Main.java:11: cannot find symbol
symbol  : class Scanner
location: class CalDifference
	Scanner sc = new Scanner(System.in);
	                 ^
Main.java:20: cannot find symbol
symbol  : variable numsq
location: class CalDifference
	sqOfElememnts(num,numsq,n);
	                  ^
Main.java:29: cannot find symbol
symbol  : class Scanner
location: class CalDifference
		Scanner sc = new Scanner(System.in);
		^
Main.java:29: cannot find symbol
symbol  : class Scanner
location: class CalDifference
		Scanner sc = new Scanner(System.in);
		                 ^
Main.java:39: cannot find symbol
symbol  : class Scanner
location: class CalDifference
	Scanner sc = new Scanner(System.in);
	^
Main.java:39: cannot find symbol
symbol  : class Scanner
location: class CalDifference
	Scanner sc = new Scanner(System.in);
	                 ^
7 errors

Standard output is empty