1 squared-2 squared +3 squared-4 squared ... -100 squared, the result

ImportJava.lang.Math;
 Public classTest{
  Public Static voidMain (string[] args){
  intn,sum=0;
   for(n=1;n<=100;n++){
SYSTEM.OUT.PRINTLN (n);
sum+= (Math.pow ( -1, (n+1))) * (n * n);
  }
 
System.out.print ("1 squared-2 squared +3 squared-4 squared ... -100 squared, and the result is:"+ sum);
 }
} 
Using the Math method in Lang
Pow (double A, double b)//to denote the B-side of a
 Public classTest{
 
  Public Static voidMain (string[] args){
  intsum=0;
   for(intn=1;n<=50;n++){
sum+= (2*n-1) * (2*n-1)-(2*n) * (2*n);
  }
  
System.out.print ("1 squared-2 squared +3 squared-4 squared ... -100 squared, and the result is:"+ sum);
 }
 
} 
Thank you very much for the solution of this problem Yongyongvi