请用用Java代码写一个堆栈

public class Stack {

int[] data;
int maxSize;
int top;
public Stack(int maxSize) {
  this.maxSize = maxSize;
  data = new int[maxSize];
  top = -1;
}

/**
  * 依次加入数据
  * @param data 要加入的数据
  * @return 添加是否成功
  */
public boolean push(int data) {
  if(top+1== maxSize) {
   System.out.println(“栈已满!”);
   return false;
  }
  this.data[++top] = data;
  return true;
}

/**
  * 从栈中取出数据
  * @return 取出的数据
  */
public int pop() throws Exception{
  if(top==-1) {
   throw new Exception(“栈已空!”);
  }
  return this.data[top--];
}

public static void main(String[] args) throws Exception {
  Stack stack=new Stack(1000);
  stack.push(1);
  stack.push(2);
  stack.push(3);
  stack.push(4);
  stack.push(5);
  while(stack.top>=0)
  {
   System.out.println(stack.pop());
  }  
}
}