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// 导入 HashMap 类 import java.util.HashMap; public class Main { public static void main(String[] args) { // 创建一个名为 people 的 HashMap 对象 HashMap<String, Integer> people = new HashMap<String, Integer>(); // 添加键值对 (姓名, 年龄) people.put("Bill", 32); people.put("Elon", 30); people.put("Steven", 33); for (String i : people.keySet()) { System.out.println("姓名: " + i + " 年龄: " + people.get(i)); } } }