单链表模拟约瑟夫环（Josepfu）

package shuJuJieGouYuSuanFa.lianBiao;


public class Josepfu {
    public static void main(String[] args) {
        LikedListJosepfu a = new LikedListJosepfu();
        a.addBoy(5);
//        a.showBoy();
        a.getBoy(1,2,5);
    }

}

class LikedListJosepfu {
    private Boy first = null;

    public void getBoy(int start, int k, int nums) {
        if (first == null || start < 1 || start > nums) {
            System.out.println("数据有误");
            return;
        }
        Boy t = first;
        //t是为了删除节点是使用，让t走到第一个孩子的后面
        while (true) {
            if (t.getNext() == first) {
                break;
            }
            t = t.getNext();
        }
        //开始数人的开始小孩
        for (int i = 0; i < start - 1; i++) {
            first = first.getNext();
            t = t.getNext();
        }
        //开始点名
        while (true) {
            if (t == first) {
                break;
            }
            //k是第几个出列
            for (int i = 0; i < k - 1; i++) {
                first = first.getNext();
                t = t.getNext();
            }
            //出列
            System.out.println(first.getNo());
            first = first.getNext();
            t.setNext(first);
        }
        //最后一个人
        System.out.println(first.getNo());
    }

    public void addBoy(int nums) {
        if (nums <= 0) {
            System.out.println("数据有误！");
            return;
        }
        Boy t = null;
        for (int i = 1; i <= nums; i++) {
            Boy boy = new Boy(i);
            if (i == 1) {
                first = boy;
                first.setNext(first);
                t = first;
            } else {
             //添加人员
                t.setNext(boy);
                boy.setNext(first);
                t = boy;
            }
        }

    }
    //显示
    public void showBoy() {
        if (first == null) {
            System.out.println("为空");
            return;
        }
        Boy t = first;
        while (true) {
            System.out.println("小孩的编号" + t.getNo());
            if (t.getNext() == first) {
                break;
            }
            t = t.getNext();
        }

    }
}

class Boy {
    private int no;
    private Boy next;

    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;
    }
}