add doubleLinkedList

src/main/java/io/github/ehlxr/datastructure/linkedlist/DoubleLinkedListDemo.java

@@ -0,0 +1,180 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright © 2020 xrv <xrg@live.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package io.github.ehlxr.datastructure.linkedlist;
+
+import java.util.Stack;
+
+/**
+ * @author ehlxr
+ * @since 2021-04-04 14:19.
+ */
+public class DoubleLinkedListDemo {
+    public static void main(String[] args) {
+        HeroNode2 hero1 = new HeroNode2(1, "宋江", "及时雨");
+        HeroNode2 hero2 = new HeroNode2(3, "卢俊义", "玉麒麟");
+        HeroNode2 hero3 = new HeroNode2(5, "吴用", "智多星");
+        HeroNode2 hero4 = new HeroNode2(8, "林冲", "豹子头");
+
+        DoubleLinkedList doubleLinkedList = new DoubleLinkedList();
+        doubleLinkedList.addByOrder(hero1);
+        doubleLinkedList.addByOrder(hero2);
+        doubleLinkedList.addByOrder(hero3);
+        doubleLinkedList.addByOrder(hero4);
+
+        doubleLinkedList.list();
+
+        doubleLinkedList.update(new HeroNode2(3, "小卢", "玉麒麟--"));
+        System.out.println("修改后的结果");
+        doubleLinkedList.list();
+
+        doubleLinkedList.del(3);
+        System.out.println("删除后的结果");
+        doubleLinkedList.list();
+    }
+}
+
+class DoubleLinkedList {
+    private final HeroNode2 head = new HeroNode2(0, "", "");
+
+    public HeroNode2 getHead() {
+        return head;
+    }
+
+    public void list() {
+        HeroNode2 temp = head.next;
+        while (temp != null) {
+            System.out.println(temp);
+            temp = temp.next;
+        }
+    }
+
+    public void add(HeroNode2 heroNode) {
+        HeroNode2 temp = head;
+        while (temp.next != null) {
+            temp = temp.next;
+        }
+        temp.next = heroNode;
+        heroNode.pre = temp;
+    }
+
+    public void addByOrder(HeroNode2 heroNode) {
+        HeroNode2 temp = head;
+        while (true) {
+            if (temp.next == null) {
+                break;
+            }
+
+            // 找到需要插入位置的前一个节点
+            if (temp.next.no > heroNode.no) {
+                break;
+            }
+
+            temp = temp.next;
+        }
+
+        heroNode.next = temp.next;
+        heroNode.pre = temp;
+
+        if (temp.next != null) {
+            temp.next.pre = heroNode;
+        }
+        temp.next = heroNode;
+    }
+
+    public void update(HeroNode2 newHeroNode) {
+        HeroNode2 temp = head.next;
+        if (temp == null) {
+            System.out.println("链表为空！");
+        }
+
+        while (true) {
+            if (temp == null) {
+                System.out.printf("没找到 %d 的节点\n", newHeroNode.no);
+                break;
+            }
+
+            if (temp.no == newHeroNode.no) {
+                temp.name = newHeroNode.name;
+                temp.nickname = newHeroNode.nickname;
+
+                break;
+            }
+
+            temp = temp.next;
+        }
+    }
+
+    public void del(int no) {
+        HeroNode2 temp = head.next;
+        if (temp == null) {
+            System.out.println("链表为空！");
+        }
+
+        while (true) {
+            if (temp == null) {
+                System.out.printf("没找到要删除的 %d 节点\n", no);
+                break;
+            }
+
+            // 找到待删除节点
+            if (temp.no == no) {
+                temp.pre.next = temp.next;
+                if (temp.next != null) {
+                    temp.next.pre = temp.pre;
+                }
+                break;
+            }
+
+            temp = temp.next;
+        }
+    }
+}
+
+/**
+ * 定义HeroNode ， 每个HeroNode 对象就是一个节点
+ */
+class HeroNode2 {
+    public int no;
+    public String name;
+    public String nickname;
+    public HeroNode2 next; //指向下一个节点
+    public HeroNode2 pre;// 指向上一个节点
+
+    // 构造器
+    public HeroNode2(int no, String name, String nickname) {
+        this.no = no;
+        this.name = name;
+        this.nickname = nickname;
+    }
+
+    /**
+     * 为了显示方法，我们重新 toString
+     */
+    @Override
+    public String toString() {
+        return "HeroNode2 [no=" + no + ", name=" + name + ", nickname=" + nickname + "]";
+    }
+
+}