public void main(String [] args) {
  sumAndDisplay(100);
}

public void sumAndDisplay(int toNumber) {
  int result = sumOfOneToN(toNumber);
  displayResult(toNumber, result);
}

public int sumOfOneToN(int toNumber) {
  int result = 0;
  for(int i = 1; i <= toNumber; i++) {
    result = result + i;
  }
  return result;
}

private void displayResult(int toNumber, int result) {
  System.out.println("Sum of 1 to " + toNumber + " is " + result);
}