在java中实现队列

Question

我有一个关于在java中实现队列的功课。我写了一段代码，但是有一个错误，我不知道如何修复它。可以请任何人帮助我吗？

这是我的代码：

public class Radha {

    public int num;
    public Radha pas;

    public Radha(int num){

        this.num = num;

    }   

    public void shfaq(){

        System.out.println(num);

    }

    public static void main (String [] args){

        Radha x = new Radha(1);
        Radhe1 r = x.new Radhe1();
        r.enqueue(1);
        r.shfaq();


    }

    class Radhe1{

        public Radha koka;
        public Radha bishti;

        Radhe1(){

            koka.pas = null;
            bishti = koka;

        }

        public void shfaq(){

            Radha theLink = koka;

            while(theLink != bishti){

                theLink.shfaq();

                theLink = theLink.pas;

            }

        }

        public boolean bosh(){

            return(bishti == koka);

        }

        public int iPari (){
            if (bosh())
                System.out.println("radha eshte bosh");
                    return(koka.num);
        }

        public void dequeue(){

            if (bosh()){
                System.out.println("radha eshte bosh");
            }
            else{
                koka = koka.pas;
            }

        }

        public void enqueue(int a){

            bishti = bishti.pas;
            bishti.num = a;
            bishti.pas = null;

        }

    }

}

Answer 1

当您撰写koka.pas = null时，您可以设置koka pas。你必须以某种方式初始化。