环形链表介绍和约瑟夫环

创建一个环形链表：

public class Josepfu {
    public static void main(String[] args) {
        CircleSingleLinkedList linkedList = new CircleSingleLinkedList();
        linkedList.addBody(5);
        linkedList.showBoys();
    }
}



//创建一个环形的单向链表
class CircleSingleLinkedList{
    //创建一个first节点，当前没有编号
    private  Boy first = null;


    //添加小孩节点，构建一个环形链表
    public void addBody(int k){
        if(k<2){
            System.out.println("请添加两个及两个以上的小孩");
            return;
        }
        Boy curBoy = null;
        for(int i=1;i<=k;i++){
            Boy boy = new Boy(i);
            if(i==1){
                first=boy;
                first.setNext(first);
                curBoy = boy;
            }else{
               curBoy.setNext(boy);
               boy.setNext(first);
               curBoy=boy;
            }
        }
    }

    //遍历环形链表
    public void showBoys(){
        if(first==null){
            System.out.println("链表为空");
        }
        Boy curBoy =first;
        while(true){
            System.out.printf("小孩的编号为%d\n",curBoy.getNo());
            if(curBoy.getNext()==first){
                break;
            }
            curBoy= curBoy.getNext();
        }
    }

}

//创建一个boy类，表示一个节点
class Boy{
    private int no;
    private Boy next;  //指向下一个节点默认为空

    public Boy(int no) {
        this.no = no;
    }

    public int getNo() {
        return no;
    }

    public void setNo(int no) {
        this.no = no;
    }

    public Boy getNext() {
        return next;
    }

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