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https://github.com/krahets/hello-algo.git
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e720aa2d24
* Sync recent changes to the revised Word. * Revised the preface chapter * Revised the introduction chapter * Revised the computation complexity chapter * Revised the chapter data structure * Revised the chapter array and linked list * Revised the chapter stack and queue * Revised the chapter hashing * Revised the chapter tree * Revised the chapter heap * Revised the chapter graph * Revised the chapter searching * Reivised the sorting chapter * Revised the divide and conquer chapter * Revised the chapter backtacking * Revised the DP chapter * Revised the greedy chapter * Revised the appendix chapter * Revised the preface chapter doubly * Revised the figures
66 lines
2 KiB
Java
66 lines
2 KiB
Java
/**
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* File: list.java
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* Created Time: 2022-11-25
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* Author: Krahets (krahets@163.com)
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*/
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package chapter_array_and_linkedlist;
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import java.util.*;
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public class list {
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public static void main(String[] args) {
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/* 初始化列表 */
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// 注意数组的元素类型是 int[] 的包装类 Integer[]
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Integer[] numbers = new Integer[] { 1, 3, 2, 5, 4 };
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List<Integer> nums = new ArrayList<>(Arrays.asList(numbers));
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System.out.println("列表 nums = " + nums);
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/* 访问元素 */
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int num = nums.get(1);
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System.out.println("访问索引 1 处的元素，得到 num = " + num);
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/* 更新元素 */
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nums.set(1, 0);
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System.out.println("将索引 1 处的元素更新为 0 ，得到 nums = " + nums);
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/* 清空列表 */
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nums.clear();
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System.out.println("清空列表后 nums = " + nums);
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/* 在尾部添加元素 */
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nums.add(1);
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nums.add(3);
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nums.add(2);
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nums.add(5);
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nums.add(4);
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System.out.println("添加元素后 nums = " + nums);
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/* 在中间插入元素 */
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nums.add(3, 6);
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System.out.println("在索引 3 处插入数字 6 ，得到 nums = " + nums);
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/* 删除元素 */
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nums.remove(3);
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System.out.println("删除索引 3 处的元素，得到 nums = " + nums);
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/* 通过索引遍历列表 */
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int count = 0;
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for (int i = 0; i < nums.size(); i++) {
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count += nums.get(i);
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}
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/* 直接遍历列表元素 */
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for (int x : nums) {
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count += x;
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}
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/* 拼接两个列表 */
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List<Integer> nums1 = new ArrayList<>(Arrays.asList(new Integer[] { 6, 8, 7, 10, 9 }));
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nums.addAll(nums1);
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System.out.println("将列表 nums1 拼接到 nums 之后，得到 nums = " + nums);
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/* 排序列表 */
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Collections.sort(nums);
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System.out.println("排序列表后 nums = " + nums);
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}
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}
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