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Update stack and queue.

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This commit is contained in:
Yudong Jin
2022-11-30 02:27:26 +08:00
parent 53cc651af2
commit 8669e06414
24 changed files with 705 additions and 186 deletions
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18
codes/java/chapter_stack_and_queue/stack.java
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@@ -11,22 +11,23 @@ import java.util.*;
public class stack {
public static void main(String[] args) {
/* 初始化栈 */
Stack<Integer> stack = new Stack<>();
// 在 Java 中，推荐将 LinkedList 当作栈来使用
LinkedList<Integer> stack = new LinkedList<>();
/* 元素入栈 */
stack.push(1);
stack.push(3);
stack.push(2);
stack.push(5);
stack.push(4);
stack.addLast(1);
stack.addLast(3);
stack.addLast(2);
stack.addLast(5);
stack.addLast(4);
System.out.println("栈 stack = " + stack);
/* 访问栈顶元素 */
int peek = stack.peek();
int peek = stack.peekLast();
System.out.println("栈顶元素 peek = " + peek);
/* 元素出栈 */
int pop = stack.pop();
int pop = stack.removeLast();
System.out.println("出栈元素 pop = " + pop + "，出栈后 stack = " + stack);
/* 获取栈的长度 */
@@ -35,5 +36,6 @@ public class stack {
/* 判断是否为空 */
boolean isEmpty = stack.isEmpty();
System.out.println("栈是否为空 = " + isEmpty);
}
}