1. Add build script for Java.

2. Add height limitation for code blocks in extra.css.
3. Fix "节点" to "结点".

docs/chapter_stack_and_queue/stack.md

@@ -287,42 +287,7 @@ comments: true
 === "Java"
 
     ```java title="linkedlist_stack.java"
-    /* 基于链表实现的栈 */
-    class LinkedListStack {
-        private ListNode stackPeek;  // 将头结点作为栈顶
-        private int stkSize = 0;   // 栈的长度
-        public LinkedListStack() {
-            stackPeek = null;
-        }
-        /* 获取栈的长度 */
-        public int size() {
-            return stkSize;
-        }
-        /* 判断栈是否为空 */
-        public boolean isEmpty() {
-            return size() == 0;
-        }
-        /* 入栈 */
-        public void push(int num) {
-            ListNode node = new ListNode(num);
-            node.next = stackPeek;
-            stackPeek = node;
-            stkSize++;
-        }
-        /* 出栈 */
-        public int pop() {
-            int num = peek();
-            stackPeek = stackPeek.next;
-            stkSize--;
-            return num;
-        }
-        /* 访问栈顶元素 */
-        public int peek() {
-            if (size() == 0)
-                throw new EmptyStackException();
-            return stackPeek.val;
-        }
-    }
+    [class]{LinkedListStack}-[func]{}
     ```
 
 === "C++"
@@ -681,38 +646,7 @@ comments: true
 === "Java"
 
     ```java title="array_stack.java"
-    /* 基于数组实现的栈 */
-    class ArrayStack {
-        private ArrayList<Integer> stack;
-        public ArrayStack() {
-            // 初始化列表（动态数组）
-            stack = new ArrayList<>();
-        }
-        /* 获取栈的长度 */
-        public int size() {
-            return stack.size();
-        }
-        /* 判断栈是否为空 */
-        public boolean isEmpty() {
-            return size() == 0;
-        }
-        /* 入栈 */
-        public void push(int num) {
-            stack.add(num);
-        }
-        /* 出栈 */
-        public int pop() {
-            if (isEmpty())
-                throw new EmptyStackException();
-            return stack.remove(size() - 1);
-        }
-        /* 访问栈顶元素 */
-        public int peek() {
-            if (isEmpty())
-                throw new EmptyStackException();
-            return stack.get(size() - 1);
-        }
-    }
+    [class]{ArrayStack}-[func]{}
     ```
 
 === "C++"