53 lines
1.6 KiB
Java
53 lines
1.6 KiB
Java
/**
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* File: hash_map.java
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* Created Time: 2022-12-04
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* Author: krahets (krahets@163.com)
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*/
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package chapter_hashing;
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import java.util.*;
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import utils.*;
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public class hash_map {
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public static void main(String[] args) {
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/* 初始化雜湊表 */
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Map<Integer, String> map = new HashMap<>();
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/* 新增操作 */
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// 在雜湊表中新增鍵值對 (key, value)
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map.put(12836, "小哈");
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map.put(15937, "小囉");
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map.put(16750, "小算");
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map.put(13276, "小法");
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map.put(10583, "小鴨");
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System.out.println("\n新增完成後，雜湊表為\nKey -> Value");
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PrintUtil.printHashMap(map);
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/* 查詢操作 */
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// 向雜湊表中輸入鍵 key ，得到值 value
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String name = map.get(15937);
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System.out.println("\n輸入學號 15937 ，查詢到姓名 " + name);
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/* 刪除操作 */
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// 在雜湊表中刪除鍵值對 (key, value)
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map.remove(10583);
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System.out.println("\n刪除 10583 後，雜湊表為\nKey -> Value");
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PrintUtil.printHashMap(map);
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/* 走訪雜湊表 */
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System.out.println("\n走訪鍵值對 Key->Value");
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for (Map.Entry<Integer, String> kv : map.entrySet()) {
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System.out.println(kv.getKey() + " -> " + kv.getValue());
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}
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System.out.println("\n單獨走訪鍵 Key");
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for (int key : map.keySet()) {
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System.out.println(key);
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}
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System.out.println("\n單獨走訪值 Value");
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for (String val : map.values()) {
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System.out.println(val);
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}
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}
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}
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