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@ -10,7 +10,7 @@
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## 栈常用操作
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栈的常用操作见下表(方法命名以 Java 为例)。
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栈的常用操作见下表,方法名需根据语言来确定,此处以 Java 为例。
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<div class="center-table" markdown>
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@ -19,8 +19,6 @@
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| push() | 元素入栈(添加至栈顶) | $O(1)$ |
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| pop() | 栈顶元素出栈 | $O(1)$ |
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| peek() | 访问栈顶元素 | $O(1)$ |
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| size() | 获取栈的长度 | $O(1)$ |
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| isEmpty() | 判断栈是否为空 | $O(1)$ |
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</div>
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@ -30,21 +28,20 @@
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```java title="stack.java"
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/* 初始化栈 */
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// 在 Java 中,推荐将 ArrayList 当作栈来使用
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List<Integer> stack = new ArrayList<>();
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Stack<Integer> stack = new Stack<>();
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/* 元素入栈 */
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stack.add(1);
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stack.add(3);
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stack.add(2);
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stack.add(5);
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stack.add(4);
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stack.push(1);
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stack.push(3);
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stack.push(2);
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stack.push(5);
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stack.push(4);
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/* 访问栈顶元素 */
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int peek = stack.get(stack.size() - 1);
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int peek = stack.peek();
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/* 元素出栈 */
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int pop = stack.remove(stack.size() - 1);
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int pop = stack.pop();
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/* 获取栈的长度 */
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int size = stack.size();
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@ -70,7 +67,7 @@
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int top = stack.top();
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/* 元素出栈 */
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stack.pop();
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stack.pop(); // 无返回值
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/* 获取栈的长度 */
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int size = stack.size();
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