如何在Java中创建哈希表？

import java.util.HashMap;

HashMap<String, Integer> hashMap = new HashMap<>();

hashMap.put("key1", 1);
hashMap.put("key2", 2);
hashMap.put("key3", 3);

int value = hashMap.get("key1");

for (String key : hashMap.keySet()) {
    System.out.println("Key: " + key + ", Value: " + hashMap.get(key));
}

import java.util.HashMap;

public class Main {
    public static void main(String[] args) {
        // 创建HashMap对象
        HashMap<String, Integer> hashMap = new HashMap<>();

        // 添加键值对
        hashMap.put("key1", 1);
        hashMap.put("key2", 2);
        hashMap.put("key3", 3);

        // 获取值
        int value = hashMap.get("key1");
        System.out.println("Value: " + value);

        // 遍历哈希表
        for (String key : hashMap.keySet()) {
            System.out.println("Key: " + key + ", Value: " + hashMap.get(key));
        }
    }
}

Value: 1
Key: key1, Value: 1
Key: key2, Value: 2
Key: key3, Value: 3