Java定义栈结构，并实现入栈、出栈操作完整示例

package com.example.demo;
import java.util.ArrayList;
public class Stack {
  ArrayList<Object> list = new ArrayList<>();
  //入栈
  public void push(Object o){
    list.add(o);
  }
  //出栈
  public Object pop(){
    Object o = list.get(list.size() - 1);
    list.remove(o);
    return o;
  }
  //栈是否为空
  public boolean isEmpty(){
    return list.isEmpty();
  }
  //栈大小
  public int size(){
    return list.size();
  }
  //打印栈元素
  @Override
  public String toString(){
    return String.valueOf(list);
  }
}
class main{
  public static void main(String[] args) {
    //创建一个栈
    Stack stack = new Stack();
    //入栈
    for(int i=1;i<=10;i++){
      stack.push(i);
    }
    //出栈
    while(!stack.isEmpty()){
      System.out.println("栈：" + stack.toString() + "\t栈大小为：" + stack.size() + "\t出栈元素为：" + stack.pop());
    }
  }
}