java語言 --- 用數組模擬棧和用鏈表模擬棧

1.用數組模擬棧

import java.util.Scanner;
public class ArrayStackDemo1 {
    public static void main(String[] args) {
        ArrayStack1 arrayStack1 = new ArrayStack1(5);
        Scanner scanner = new Scanner(System.in);
        boolean loop = true;
        String  menu = "";
        while (loop){
            System.out.println("push");
            System.out.println("pop");
            System.out.println("exit");
            System.out.println("list");
            System.out.println("top");
            System.out.println("請輸入菜單： ");
            menu = scanner.next();
            switch (menu){
                case "push":
                    System.out.println("請輸入一個數： ");
                    int data = scanner.nextInt();
                    arrayStack1.push(data);
                    break;
                case "pop":
                    System.out.println("出棧的數據是："+arrayStack1.pop());
                    break;
                case "list":
                    arrayStack1.list();
                    System.out.println();
                    break;
                case "top":
                    System.out.println(arrayStack1.top());
                    break;
                case "exit":
                    scanner.close();
                    loop = false;
                    break;
            }
        }
    }
}
class ArrayStack1{
    public int maxSize;//棧的最大size
    public int [] stack ; //用數組模擬棧
    public int top = -1;//棧頂 初始化爲 -1

    public ArrayStack1(int maxSize) {
        this.maxSize = maxSize;
        stack = new int[maxSize];
    }

    //棧滿
    public boolean isFull(){
        return  top == maxSize - 1;
    }
    //棧空
    public boolean isEmpty(){
        return top == -1;
    }

    //入棧
    public void push(int data){
        //入棧需要判滿
        if (isFull()){
            System.out.println("棧已經滿了，不能入棧");
            return;
        }
        top ++;
        stack[top] = data;
    }
    //出棧需要判空
    public int pop(){
        if (isEmpty()){
            System.out.println("這個棧是空的！！！");
            return 0;
        }
        int value = stack[top];
        top --;
        return value;
    }
    public int top(){
        return stack[top];
    }
    //遍歷棧
    public void list(){
        if (isEmpty()){
            System.out.println("沒有數據！！");
            return;
        }
        for (int i = top; i >=0 ; i --) {
            System.out.print(stack[i]+" ");
        }
    }
}

2.用鏈表模擬棧

import java.util.Scanner;
public class LinlistStackDemo2 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        SingleLinkListStack1 stack1 = new SingleLinkListStack1();
        boolean loop = true;
        String menu = "";
        while (loop){
            System.out.println("push");
            System.out.println("pop");
            System.out.println("show");
            System.out.println("top");
            System.out.println("exit");
            System.out.println("請輸入菜單： ");
            menu = scanner.next();
            switch (menu){
                case "push":
                    System.out.println("請輸入一個數： ");
                    int  data = scanner.nextInt();
                    stack1.push(new Node2(data));
                    break;
                case "pop":
                    System.out.println(stack1.pop());
                    break;
                case "show":
                    stack1.show();
                    break;
                case "top":
                    System.out.println(stack1.top());
                    break;
                case "exit":
                    loop = false;
                    break;
                default:
                   System.out.println("輸入格式不正確 !!!");
                   break;
            }
        }

    }
}
//帶頭節點的鏈表模擬棧
class  SingleLinkListStack1{
    SingleLinkList1 singleLinkList1 = new SingleLinkList1();
    public void push(Node2 node2){
        singleLinkList1.add(node2);
    }
    public Node2 pop(){
        return singleLinkList1.get();
    }
    public Node2 top (){
        return singleLinkList1.getTop();
    }
    public void show(){
        singleLinkList1.show();
    }
}
//單鏈表
class  SingleLinkList1{
    Node2 head2 = new Node2(-1);
    //用頭插法向鏈表中插入數據
    public void add(Node2 node2){
        Node2 temp = this.head2.getNext();
        this.head2.setNext(node2);
        node2.setNext(temp);
    }
    public Node2 get(){
        //判空
        if (this.head2.getNext() == null){
            System.out.println("鏈表爲空！！！！");
            return null;
        }
        this.head2 = this.head2.getNext();
        return head2;
    }
    public void show(){
        //判空
        if (this.head2.getNext() == null){
            System.out.println("鏈表爲空！！！！");
            return ;
        }
        Node2 temp = this.head2.getNext();
        while (temp != null){
            System.out.println(temp.getData());
            temp = temp.getNext();
        }
    }
    public Node2 getTop(){
        return this.head2.getNext();//返回第一個節點
    }
}
class Node2{
    private int data;
    private Node2 next;

    public Node2(int data) {
        this.data = data;
    }

    public void setData(int data) {
        this.data = data;
    }

    public void setNext(Node2 next) {
        this.next = next;
    }

    public int getData() {
        return data;
    }

    public Node2 getNext() {
        return next;
    }

    @Override
    public String toString() {
        return "Node2{" +
                "data=" + data +
                '}';
    }
}