数据结构（Java）下压堆栈

核心代码

public class Stack {
    //节点
    private class Node{
        Object obj;
        Node next;
    }
    //栈针（用于指向栈顶元素）
    private Node node_first = null;

    //计数器
    private int Nub = 0;
    public int getNub() {
        return Nub;
    }

    //判断栈是否为空
    public Boolean IsEmpty(){
        return node_first == null;
    }

    //弹栈pop
    public  Object pop(){
        if(Nub == 0 || node_first == null){
            System.out.println("栈已空，无法弹栈");
            return "";
        }


        Object T = node_first.obj;

        node_first = node_first.next;
        Nub--;

        return T;
    }

    //压栈push
    public void push(Object obj){
        //新节点的数据
        Node NewNode = new Node();
        NewNode.obj = obj;
        NewNode.next = node_first;

        node_first = NewNode;
        Nub++;
    }

    //遍历输出
    public void printf(){
        Node t = node_first;

        for(int i = 0; i < Nub; i++){
            System.out.print(t.obj + " ");
            t = t.next;
        }
    }
}

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测试代码

public class Text {
    public static void main(String[] args){
        Stack text = new Stack();

        System.out.println(text.getNub());
        System.out.println(text.IsEmpty() ? "栈为空" : "栈内有值");

        text.push(3);
        text.push(4);
        text.push(5);

        text.printf();

        System.out.println(text.IsEmpty() ? "栈为空" : "栈内有值");
        System.out.println(text.getNub());

        text.pop();
        text.pop();
        text.pop();
        text.pop();
        text.pop();


        System.out.println(text.IsEmpty() ? "栈为空" : "栈内有值");
        System.out.println(text.getNub());
    }
}

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输出结果：

"C:\Program Files\Java\jdk1.8.0_333\bin\java.exe" "-javaagent:D:\IDEA\IntelliJ IDEA Community Edition 2020.3\lib\idea_rt.jar=51426:D:\IDEA\IntelliJ IDEA Community Edition 2020.3\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_333\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_333\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_333\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_333\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_333\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_333\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_333\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_333\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_333\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_333\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_333\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_333\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_333\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_333\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_333\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_333\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_333\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_333\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_333\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_333\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_333\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_333\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_333\jre\lib\rt.jar;E:\······后端······\1.2 ····java系列····\01_代码库\练习\栈（链表）\out\production\untitled" Text
0
栈为空
5 4 3 栈内有值
3
栈已空，无法弹栈
栈已空，无法弹栈
栈为空
0

进程已结束，退出代码为 0

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感谢观看~