Java实现顺序栈原理解析

package stack;

public class ArrayStack {
  private int maxSize;//最大值
  private int[] stack;//栈
  private int top=-1;//栈顶
  
  //构造器
  public ArrayStack(int maxSize) {
    this.maxSize=maxSize;
    stack=new int[this.maxSize];
  }
  
  //栈满
  public boolean isFull() {
    return top==maxSize-1;
  }
  
  //栈空  
  public boolean isEmpty() {
    return top==-1;
  }
  
  //入栈-push
  public void push(int value) {
    //先判断是否栈满了
    if(isFull()) {
      System.out.println("栈已经满了~");
      return;
    }else {
      top++;
      stack[top]=value;
    }
  }
  
  //出栈-pop
  public int pop() {
    if(isEmpty()) {
      throw new RuntimeException("栈已经空了~");
    }
    int value=stack[top];
    top--;
    return value;
  }
  
  //遍历栈
  
  public void list() {
    if(isEmpty()) {
      System.out.println("栈空，没有数据~");
    }
    for(int i=top;i>=0;i--) {
      System.out.printf("stack[%d]=%d\n",i,stack[i]);
    }
  }
}

package stack;

import java.util.Scanner;

public class TestArrayList {

  public static void main(String[] args) {
    // TODO Auto-generated method stub
    ArrayStack stack=new ArrayStack(4);
    String key="";
    boolean loop=true;
    Scanner scanner=new Scanner(System.in);
    while(loop) {
      System.out.println("show:显示栈");
      System.out.println("exit:退出测试");
      System.out.println("push:压栈");
      System.out.println("pop:出栈");
      System.out.println("请输入你的选择:");
      key=scanner.next();
      switch (key) {
      case "show":
        stack.list();
        break;
      case "push":
        System.out.println("请输入一个数:");
        int value=scanner.nextInt();
        stack.push(value);
        break;
      case "pop":
        try {
          int res=stack.pop();
          System.out.printf("出栈的元素为:%d\n",res);
        } catch (Exception e) {
          // TODO: handle exception
          System.out.println(e.getMessage());
        }
        break;
      case "exit":
        scanner.close();
        loop=false;
        break;

      default:
        break;
      }
    }
    System.out.println("程序退出!");
  }
}