Java示例数字的总和1

import java.io.IOException;

public class AdditionStack {
   static int num;
   static int ans;
   static Stack theStack;
   public static void main(String[] args)

   throws IOException {
      num = 50;
      stackAddition();
      System.out.println("Sum=" + ans);
   }

   public static void stackAddition() {
      theStack = new Stack(10000);
      ans = 0;
      while (num > 0) {
         theStack.push(num);
         --num;
      }

      while (!theStack.isEmpty()) {
         int newN = theStack.pop();
         ans += newN;
      }
   }
}

class Stack {
   private int maxSize;
   private int[] data;
   private int top;
   public Stack(int s) {
      maxSize = s;
      data = new int[maxSize];
      top = -1;
   }

   public void push(int p) {
      data[++top] = p;
   }

   public int pop() {
      return data[top--];
   }

   public int peek() {
      return data[top];
   }

   public boolean isEmpty() {
      return (top == -1);
   }
}