003.单向链表

 

package com.demo.linkedlist;

/**
 * description
 * @author xiangqian
 * @since 2022/05/16 10:18
 */
public class HeroNode {

    /**
     * 编号
     */
    private int no;

    /**
     * 姓名
     */
    private String name;

    /**
     * 昵称
     */
    private String nikeName;

    /**
     * 下一个节点
     */
    private HeroNode next;

    public HeroNode(int no, String name, String nikeName) {
        this.no = no;
        this.name = name;
        this.nikeName = nikeName;
    }

    @Override
    public String toString() {
        return "HeroNode{" + "no=" + no + ", name='" + name + '\'' + ", nikeName='" + nikeName + '\'' + '}';
    }

    public int getNo() {
        return no;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getNikeName() {
        return nikeName;
    }

    public void setNikeName(String nikeName) {
        this.nikeName = nikeName;
    }

    public HeroNode getNext() {
        return next;
    }

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

package com.demo.linkedlist;

/**
 * description
 * @author xiangqian
 * @since 2022/05/16 10:21
 */
public class LinkedListDemo {

    /**
     * 头节点
     */
    public HeroNode head = new HeroNode(0, "", "");

    /**
     * 新增数据
     */
    public void add(HeroNode heroNode) {
        HeroNode temp = head;
        while (true) {
            if (temp.getNext() == null) {
                break;
            }
            temp = temp.getNext();
        }
        temp.setNext(heroNode);
    }

    /**
     * 新增数据并排序
     */
    public void addSort(HeroNode heroNode) {
        HeroNode temp = head;
        //标识添加的编号是否存在
        boolean flag = false;
        while (true) {
            if (temp.getNext() == null) {
                break;
            }
            if (temp.getNext().getNo() > heroNode.getNo()) {
                break;
            } else if (temp.getNext().getNo() == heroNode.getNo()) {
                flag = true;
                break;
            }
            temp = temp.getNext();
        }

        if (flag) {
            throw new RuntimeException("准备插入的编号已经存在");
        } else {
            heroNode.setNext(temp.getNext());
            temp.setNext(heroNode);
        }
    }

    /**
     * 修改链表数据
     */
    public void update(HeroNode heroNode) {
        HeroNode temp = head;
        //表示是否查询到节点
        boolean flag = false;
        while (true) {
            if (temp.getNext() == null) {
                break;
            }
            if (temp.getNext().getNo() == heroNode.getNo()) {
                flag = true;
                break;
            }
            temp = temp.getNext();
        }

        if (flag) {
            temp.getNext().setName(heroNode.getName());
            temp.getNext().setNikeName(heroNode.getNikeName());
        } else {
            throw new RuntimeException("准备插入的编号不存在");
        }
    }

    /**
     * 删除链表数据
     */
    public void delete(int no) {
        HeroNode temp = head;
        //标识添加的编号是否存在
        boolean flag = false;
        while (true) {
            if (temp.getNext() == null) {
                break;
            }
            if (temp.getNext().getNo() == no) {
                flag = true;
                break;
            }
            temp = temp.getNext();
        }

        if (flag) {
            temp.setNext(temp.getNext().getNext());
        } else {
            throw new RuntimeException("准备删除的编号不存在");
        }
    }

    /**
     * 遍历数据
     */
    public void list() {
        if (head.getNext() == null) {
            System.out.println("链表为空");
            return;
        }
        HeroNode temp = head.getNext();
        while (true) {
            if (temp == null) {
                break;
            }
            System.out.println(temp);
            temp = temp.getNext();
        }
    }

    public static void main(String[] args) {
        LinkedListDemo linkedListDemo = new LinkedListDemo();
        HeroNode heroNode1 = new HeroNode(1, "东", "小东");
        HeroNode heroNode2 = new HeroNode(2, "南", "小南");
        HeroNode heroNode3 = new HeroNode(3, "西", "小西");
        HeroNode heroNode4 = new HeroNode(4, "北", "小北");

        linkedListDemo.addSort(heroNode1);
        linkedListDemo.addSort(heroNode3);
        linkedListDemo.addSort(heroNode2);
        linkedListDemo.addSort(heroNode4);

        HeroNode heroNode5 = new HeroNode(3, "2西", "2小西");
        linkedListDemo.update(heroNode5);

        linkedListDemo.delete(4);

        linkedListDemo.list();
    }
}