update at 2021-12-25 22:49:21 by ehlxr

budd-common/src/main/java/io/github/ehlxr/datastructure/Node.java

@@ -22,7 +22,7 @@
  * THE SOFTWARE.
  */
 
-package io.github.ehlxr.datastructure.linkedlist;
+package io.github.ehlxr.datastructure;
 
 /**
  * 链表节点数据结构
@@ -30,37 +30,38 @@ package io.github.ehlxr.datastructure.linkedlist;
  * @author ehlxr
  * @since 2021-12-23 14:41.
  */
-public class Node {
+public class Node<K> {
-    private Integer val;
+    private K val;
-    private Node next;
+    private Node<K> next;
 
-    public Node(Integer val, Node next) {
+    public Node(K val, Node<K> next) {
         this.val = val;
         this.next = next;
     }
 
-    public Integer getVal() {
+    public K getVal() {
         return val;
     }
 
-    public void setVal(Integer val) {
+    public void setVal(K val) {
         this.val = val;
     }
 
-    public Node getNext() {
+    public Node<K> getNext() {
         return next;
     }
 
-    public void setNext(Node next) {
+    public void setNext(Node<K> next) {
         this.next = next;
     }
 
     public void print() {
-        Node n = this;
+        Node<K> n = this;
         while (n != null) {
-            System.out.printf("%s -> ", n);
+            System.out.printf("%s -> ", n.getVal());
             n = n.getNext();
         }
+        System.out.print("null");
         System.out.println();
     }
 

budd-common/src/main/java/io/github/ehlxr/datastructure/linkedlist/ReverseLinkedList.java

@@ -24,6 +24,8 @@
 
 package io.github.ehlxr.datastructure.linkedlist;
 
+import io.github.ehlxr.datastructure.Node;
+
 /**
  * 反转链表
  *
@@ -32,12 +34,12 @@ package io.github.ehlxr.datastructure.linkedlist;
  */
 public class ReverseLinkedList {
     public static void main(String[] args) {
-        Node n5 = new Node(5, null);
+        Node<Integer> n5 = new Node<>(5, null);
-        Node n4 = new Node(4, n5);
+        Node<Integer> n4 = new Node<>(4, n5);
-        Node n3 = new Node(3, n4);
+        Node<Integer> n3 = new Node<>(3, n4);
-        Node n2 = new Node(2, n3);
+        Node<Integer> n2 = new Node<>(2, n3);
-        Node n1 = new Node(1, n2);
+        Node<Integer> n1 = new Node<>(1, n2);
-        Node head = new Node(0, n1);
+        Node<Integer> head = new Node<>(0, n1);
 
         head.print();
 
@@ -50,15 +52,15 @@ public class ReverseLinkedList {
 
 
     // 循环方式
-    public static Node reverse(Node head) {
+    public static Node<Integer> reverse(Node<Integer> head) {
         if (head == null || head.getNext() == null) {
             return head;
         }
-        Node pre = null;
+        Node<Integer> pre = null;
 
-        Node cur = head;
+        Node<Integer> cur = head;
         while (cur != null) {
-            Node next = cur.getNext();
+            Node<Integer> next = cur.getNext();
             cur.setNext(pre);
             pre = cur;
 
@@ -69,13 +71,13 @@ public class ReverseLinkedList {
     }
 
     // 递归一
-    public static Node reverse2(Node head) {
+    public static Node<Integer> reverse2(Node<Integer> head) {
         if (head == null || head.getNext() == null) {
             return head;
         }
 
-        Node next = head.getNext();
+        Node<Integer> next = head.getNext();
-        Node node = reverse2(next);
+        Node<Integer> node = reverse2(next);
 
         head.getNext().setNext(head);
         head.setNext(null);
@@ -84,13 +86,13 @@ public class ReverseLinkedList {
     }
 
     // 递归二
-    public static Node reverse3(Node head, Node pre) {
+    public static Node<Integer> reverse3(Node<Integer> head, Node<Integer> pre) {
         if (head == null) {
             return pre;
         }
 
-        Node next = head.getNext();
+        Node<Integer> next = head.getNext();
-        Node node = reverse3(next, head);
+        Node<Integer> node = reverse3(next, head);
 
         head.setNext(pre);
 

budd-common/src/main/java/io/github/ehlxr/datastructure/queue/LinkedListQueue.java

@@ -24,7 +24,7 @@
 
 package io.github.ehlxr.datastructure.queue;
 
-import io.github.ehlxr.datastructure.linkedlist.Node;
+import io.github.ehlxr.datastructure.Node;
 
 /**
  * 基于链表实现的队列
@@ -35,13 +35,12 @@ import io.github.ehlxr.datastructure.linkedlist.Node;
  * @since 2021-12-25 16:02.
  */
 public class LinkedListQueue {
-    private Node head;
+    private Node<Integer> head;
 
     public static void main(String[] args) {
         LinkedListQueue queue = new LinkedListQueue();
         for (int i = 0; i < 6; i++) {
             System.out.println(queue.enqueue(i));
-            queue.getData().print();
         }
 
         for (int i = 0; i < 6; i++) {
@@ -57,14 +56,14 @@ public class LinkedListQueue {
      * 时间复杂度 O(n)
      */
     public boolean enqueue(Integer item) {
-        Node node = new Node(item, null);
+        Node<Integer> node = new Node<>(item, null);
         if (head == null) {
             head = node;
             return true;
         }
 
         // 找到队尾
-        Node tail = head;
+        Node<Integer> tail = head;
         while (tail.getNext() != null) {
             tail = tail.getNext();
         }
@@ -87,7 +86,7 @@ public class LinkedListQueue {
         return val;
     }
 
-    public Node getData() {
+    public Node<Integer> getData() {
         return head;
     }
 }

budd-common/src/main/java/io/github/ehlxr/datastructure/queue/LinkedListQueue2.java

@@ -24,7 +24,7 @@
 
 package io.github.ehlxr.datastructure.queue;
 
-import io.github.ehlxr.datastructure.linkedlist.Node;
+import io.github.ehlxr.datastructure.Node;
 
 /**
  * 基于链表实现的队列
@@ -35,14 +35,13 @@ import io.github.ehlxr.datastructure.linkedlist.Node;
  * @since 2021-12-25 16:48.
  */
 public class LinkedListQueue2 {
-    private Node head = null;
+    private Node<Integer> head = null;
-    private Node tail = null;
+    private Node<Integer> tail = null;
 
     public static void main(String[] args) {
         LinkedListQueue2 queue = new LinkedListQueue2();
         for (int i = 0; i < 6; i++) {
             System.out.println(queue.enqueue(i));
-            queue.getData().print();
         }
 
         for (int i = 0; i < 6; i++) {
@@ -58,7 +57,7 @@ public class LinkedListQueue2 {
      * 时间复杂度 O(1)
      */
     public boolean enqueue(Integer item) {
-        Node node = new Node(item, null);
+        Node<Integer> node = new Node<Integer>(item, null);
 
         if (tail == null) {
             head = node;
@@ -89,7 +88,7 @@ public class LinkedListQueue2 {
         return val;
     }
 
-    public Node getData() {
+    public Node<Integer> getData() {
         return head;
     }
 }

budd-common/src/main/java/io/github/ehlxr/datastructure/stack/ArrayStack.java

@@ -0,0 +1,77 @@
+/*
+ * 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.stack;
+
+/**
+ * @author ehlxr
+ * @since 2021-12-25 22:10.
+ */
+public class ArrayStack {
+    private final Integer[] data;
+    private final int size;
+    // 栈顶下标
+    private int top = 0;
+
+    public static void main(String[] args) {
+        ArrayStack stack = new ArrayStack(5);
+        for (int i = 0; i < 6; i++) {
+            System.out.println(stack.push(i));
+        }
+
+        for (int i = 0; i < 6; i++) {
+            System.out.println(stack.pop());
+        }
+
+    }
+
+    public ArrayStack(int size) {
+        data = new Integer[size];
+        this.size = size;
+    }
+
+    /**
+     * 入栈
+     */
+    public boolean push(Integer item) {
+        // 判断栈是否已满
+        if (top == size) {
+            return false;
+        }
+        data[top++] = item;
+
+        return true;
+    }
+
+    /**
+     * 出栈
+     */
+    public Integer pop() {
+        // 判断栈是否为空
+        if (top == 0) {
+            return null;
+        }
+        return data[--top];
+    }
+}

budd-common/src/main/java/io/github/ehlxr/datastructure/stack/LinkedListStack.java

@@ -0,0 +1,80 @@
+/*
+ * 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.stack;
+
+import io.github.ehlxr.datastructure.Node;
+
+/**
+ * @author ehlxr
+ * @since 2021-12-25 22:28.
+ */
+public class LinkedListStack {
+    private Node<Integer> head;
+
+    public Node<Integer> getData() {
+        return head;
+    }
+
+    public static void main(String[] args) {
+        LinkedListStack stack = new LinkedListStack();
+        for (int i = 0; i < 6; i++) {
+            System.out.println(stack.push(i));
+        }
+
+        for (int i = 0; i < 6; i++) {
+            stack.getData().print();
+            System.out.println(stack.pop());
+        }
+
+    }
+
+    /**
+     * 入栈
+     */
+    public boolean push(Integer item) {
+        Node<Integer> node = new Node<>(item, null);
+        if (head == null) {
+            head = node;
+            return true;
+        }
+
+        node.setNext(head);
+        head = node;
+        return true;
+    }
+
+    /**
+     * 出栈
+     */
+    public Integer pop() {
+        if (head == null) {
+            return null;
+        }
+
+        Integer val = head.getVal();
+        head = head.getNext();
+        return val;
+    }
+}