用數組實作一個棧

首先是建立一個資料結構包括尺寸、數組模拟棧、定義棧頂top。構造器初始化size然後建立棧并且傳入size。接着判斷空、滿

進行出入棧操作、顯示，最後測試建立對象初始化添加删除檢視

package com.Stack;


import java.util.Scanner;

/**
 * @Auther: 大哥的叔
 * @Date: 2019/7/30 07:30
 * @Description:
 */
public class ArrayStackDemo{
    public static void main (String[] args) {
        ArrayStack stack = new ArrayStack(4);
        String key = "";
        boolean loop = true;
        Scanner scanner = new Scanner(System.in);
        while(loop) {
            System.out.println("show: 表示顯示棧");
            System.out.println("exit: 退出程式");
            System.out.println("push: 表示添加資料到棧(入棧)");
            System.out.println("pop: 表示從棧取出資料(出棧)");
            System.out.println("請輸入你的選擇");
            key = scanner.next();
            switch (key) {
                case "show":
                    stack.list();
                    break;
                case "push":
                    System.out.println("請輸入一個數");
                    int value = scanner.nextInt();
                    stack.push(value);
                    break;
                case "pop":
                    try {
                        int res = stack.pop();
                        System.out.printf("出棧的資料是 %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("程式退出~~~");
    }

}


class ArrayStack{

    private int maxSize;
    private int stack[];
    private  int top = -1;// top表示棧頂，初始化為-1

    public ArrayStack (int maxSize) {
        this.maxSize = maxSize;
        stack = new  int[this.maxSize];
    }
    //棧滿
    public boolean isFull(){
        return top == maxSize - 1;
    }
    public boolean isEmpty(){
        return top == -1;
    }

    public void push(int value){
        if (isFull()){
            System.out.println("滿");
            return;
        }
        top++;
        stack[top] = value;
    }

    public int pop(){
        if (isEmpty()){
            throw new RuntimeException("空");
        }
        int value = stack[top];
        top--;
        return value;
    }

    public void list(){
        if (isEmpty()){
            System.out.println("空");
            return;
        }
        for (int i = top; i >=0; i--) {
            System.out.printf("stack[%d]=%d\n",i,stack[i]);
        }
    }
}