public class TestVarargs {          public static void main(String[] args) {                    int sum = 0;                    sum = MathTool.sum(1, 2);                    System.out.println("1 + 2 = " + sum);                    sum = MathTool.sum(1, 2, 3);                    System.out.println("1 + 2 +3 = " + sum);                    sum = MathTool.sum(1, 2, 3, 4, 5);                    System.out.println("1 + 2 + 3 + 4 + 5 = " + sum);          } }