update at 2021-12-25 23:23:33 by ehlxr

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

@@ -30,33 +30,33 @@ package io.github.ehlxr.datastructure;
  * @author ehlxr
  * @since 2021-12-23 14:41.
  */
-public class Node<K> {
-    private K val;
-    private Node<K> next;
+public class Node<T> {
+    private T val;
+    private Node<T> next;
 
-    public Node(K val, Node<K> next) {
+    public Node(T val, Node<T> next) {
         this.val = val;
         this.next = next;
     }
 
-    public K getVal() {
+    public T getVal() {
         return val;
     }
 
-    public void setVal(K val) {
+    public void setVal(T val) {
         this.val = val;
     }
 
-    public Node<K> getNext() {
+    public Node<T> getNext() {
         return next;
     }
 
-    public void setNext(Node<K> next) {
+    public void setNext(Node<T> next) {
         this.next = next;
     }
 
     public void print() {
-        Node<K> n = this;
+        Node<T> n = this;
         while (n != null) {
             System.out.printf("%s -> ", n.getVal());
             n = n.getNext();

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

@@ -32,8 +32,9 @@ import io.github.ehlxr.datastructure.Node;
  * @author ehlxr
  * @since 2021-12-23 14:40.
  */
-public class ReverseLinkedList {
+public class ReverseLinkedList<T> {
     public static void main(String[] args) {
+        ReverseLinkedList<Integer> reverseLinkedList = new ReverseLinkedList<>();
         Node<Integer> n5 = new Node<>(5, null);
         Node<Integer> n4 = new Node<>(4, n5);
         Node<Integer> n3 = new Node<>(3, n4);
@@ -45,22 +46,22 @@ public class ReverseLinkedList {
 
         System.out.println("-------------");
         // head = reverse(head);
-        head = reverse2(head);
+        head = reverseLinkedList.reverse2(head);
         // head = reverse3(head, null);
         head.print();
     }
 
 
     // 循环方式
-    public static Node<Integer> reverse(Node<Integer> head) {
+    public Node<T> reverse(Node<T> head) {
         if (head == null || head.getNext() == null) {
             return head;
         }
-        Node<Integer> pre = null;
+        Node<T> pre = null;
 
-        Node<Integer> cur = head;
+        Node<T> cur = head;
         while (cur != null) {
-            Node<Integer> next = cur.getNext();
+            Node<T> next = cur.getNext();
             cur.setNext(pre);
             pre = cur;
 
@@ -71,13 +72,13 @@ public class ReverseLinkedList {
     }
 
     // 递归一
-    public static Node<Integer> reverse2(Node<Integer> head) {
+    public Node<T> reverse2(Node<T> head) {
         if (head == null || head.getNext() == null) {
             return head;
         }
 
-        Node<Integer> next = head.getNext();
-        Node<Integer> node = reverse2(next);
+        Node<T> next = head.getNext();
+        Node<T> node = reverse2(next);
 
         head.getNext().setNext(head);
         head.setNext(null);
@@ -86,13 +87,13 @@ public class ReverseLinkedList {
     }
 
     // 递归二
-    public static Node<Integer> reverse3(Node<Integer> head, Node<Integer> pre) {
+    public Node<T> reverse3(Node<T> head, Node<T> pre) {
         if (head == null) {
             return pre;
         }
 
-        Node<Integer> next = head.getNext();
-        Node<Integer> node = reverse3(next, head);
+        Node<T> next = head.getNext();
+        Node<T> node = reverse3(next, head);
 
         head.setNext(pre);
 

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

@@ -34,11 +34,11 @@ import io.github.ehlxr.datastructure.Node;
  * @author ehlxr
  * @since 2021-12-25 16:02.
  */
-public class LinkedListQueue {
-    private Node<Integer> head;
+public class LinkedListQueue<T> {
+    private Node<T> head;
 
     public static void main(String[] args) {
-        LinkedListQueue queue = new LinkedListQueue();
+        LinkedListQueue<Integer> queue = new LinkedListQueue<>();
         for (int i = 0; i < 6; i++) {
             System.out.println(queue.enqueue(i));
         }
@@ -55,15 +55,15 @@ public class LinkedListQueue {
      * 入队（从队尾添加元素）
      * 时间复杂度 O(n)
      */
-    public boolean enqueue(Integer item) {
-        Node<Integer> node = new Node<>(item, null);
+    public boolean enqueue(T item) {
+        Node<T> node = new Node<T>(item, null);
         if (head == null) {
             head = node;
             return true;
         }
 
         // 找到队尾
-        Node<Integer> tail = head;
+        Node<T> tail = head;
         while (tail.getNext() != null) {
             tail = tail.getNext();
         }
@@ -75,18 +75,18 @@ public class LinkedListQueue {
     /**
      * 出队（从队首取出元素）
      */
-    public Integer dequeue() {
+    public T dequeue() {
         if (head == null) {
             return null;
         }
 
-        Integer val = head.getVal();
+        T val = head.getVal();
         head = head.getNext();
 
         return val;
     }
 
-    public Node<Integer> getData() {
+    public Node<T> getData() {
         return head;
     }
 }

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

@@ -34,12 +34,12 @@ import io.github.ehlxr.datastructure.Node;
  * @author ehlxr
  * @since 2021-12-25 16:48.
  */
-public class LinkedListQueue2 {
-    private Node<Integer> head = null;
-    private Node<Integer> tail = null;
+public class LinkedListQueue2<T> {
+    private Node<T> head = null;
+    private Node<T> tail = null;
 
     public static void main(String[] args) {
-        LinkedListQueue2 queue = new LinkedListQueue2();
+        LinkedListQueue2<Integer> queue = new LinkedListQueue2<>();
         for (int i = 0; i < 6; i++) {
             System.out.println(queue.enqueue(i));
         }
@@ -56,8 +56,8 @@ public class LinkedListQueue2 {
      * 入队（从队尾添加元素）
      * 时间复杂度 O(1)
      */
-    public boolean enqueue(Integer item) {
-        Node<Integer> node = new Node<Integer>(item, null);
+    public boolean enqueue(T item) {
+        Node<T> node = new Node<>(item, null);
 
         if (tail == null) {
             head = node;
@@ -73,12 +73,12 @@ public class LinkedListQueue2 {
     /**
      * 出队（从队首取出元素）
      */
-    public Integer dequeue() {
+    public T dequeue() {
         if (head == null) {
             return null;
         }
 
-        Integer val = head.getVal();
+        T val = head.getVal();
         head = head.getNext();
         // 如果队列为空了，需要把 tail 置空
         if (head == null) {
@@ -88,7 +88,7 @@ public class LinkedListQueue2 {
         return val;
     }
 
-    public Node<Integer> getData() {
+    public Node<T> getData() {
         return head;
     }
 }

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

@@ -30,15 +30,15 @@ import io.github.ehlxr.datastructure.Node;
  * @author ehlxr
  * @since 2021-12-25 22:28.
  */
-public class LinkedListStack {
-    private Node<Integer> head;
+public class LinkedListStack<T> {
+    private Node<T> head;
 
-    public Node<Integer> getData() {
+    public Node<T> getData() {
         return head;
     }
 
     public static void main(String[] args) {
-        LinkedListStack stack = new LinkedListStack();
+        LinkedListStack<Integer> stack = new LinkedListStack<>();
         for (int i = 0; i < 6; i++) {
             System.out.println(stack.push(i));
         }
@@ -53,8 +53,8 @@ public class LinkedListStack {
     /**
      * 入栈
      */
-    public boolean push(Integer item) {
-        Node<Integer> node = new Node<>(item, null);
+    public boolean push(T item) {
+        Node<T> node = new Node<>(item, null);
         if (head == null) {
             head = node;
             return true;
@@ -68,13 +68,17 @@ public class LinkedListStack {
     /**
      * 出栈
      */
-    public Integer pop() {
+    public T pop() {
         if (head == null) {
             return null;
         }
 
-        Integer val = head.getVal();
+        T val = head.getVal();
         head = head.getNext();
         return val;
     }
+
+    public void clear() {
+        head = null;
+    }
 }