Java示例数字总和

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);

   }

}