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public 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);
	sqOfElememnts(num,numsq);
	sumOfSq = sum(numSq) * sum(numSq);
	sqOfSums =sum(num) * sum(num);	
	diff= sumOfSq - sqOfSums;
 
	public void inputElements(int a[]){
 
		for(int i=0; i<n;i++){
		a[i]=sc.nextInt();
		}
	}
 
	public void sqOfElements(int a[],int aSq[]){
 
		for(int i=0 ; i<n ; i++){
		aSq[i] = a[i] * a[i];
		}
	}
 
	public int sum(int a[]){
 
	int sum = 0;
		for(int i=0; i<n;i++){
		sum = sum + a[i];
		}
	}
 
 
}
 
}

Main.java:23: illegal start of expression
	public void inputElements(int a[]){
	^
Main.java:23: illegal start of expression
	public void inputElements(int a[]){
	       ^
Main.java:23: ';' expected
	public void inputElements(int a[]){
	                         ^
Main.java:23: ';' expected
	public void inputElements(int a[]){
	                                 ^
Main.java:30: illegal start of expression
	public void sqOfElements(int a[],int aSq[]){
	^
Main.java:30: illegal start of expression
	public void sqOfElements(int a[],int aSq[]){
	       ^
Main.java:30: ';' expected
	public void sqOfElements(int a[],int aSq[]){
	                        ^
Main.java:30: <identifier> expected
	public void sqOfElements(int a[],int aSq[]){
	                                 ^
Main.java:30: not a statement
	public void sqOfElements(int a[],int aSq[]){
	                                        ^
Main.java:30: ';' expected
	public void sqOfElements(int a[],int aSq[]){
	                                          ^
Main.java:37: illegal start of expression
	public int sum(int a[]){
	^
Main.java:37: ';' expected
	public int sum(int a[]){
	              ^
Main.java:37: ';' expected
	public int sum(int a[]){
	                      ^
13 errors

Standard output is empty