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public static void main(String[] args) { HashMap<String, String> map = new HashMap<>(); map.put("西姆", "西姆"); map.put("汤姆", "汤姆"); map.put("阿勃斯", "阿勃斯"); map.put("婴儿", "婴儿"); map.put("猫", "猫"); map.put("狗", "狗"); map.put("吃", "吃"); map.put("食物", "食物"); map.put("万能激活卡", "万能激活卡"); map.put("拥抱", "拥抱"); printKeys(map); } public static void printKeys(Map<String, String> map) { //在此编写你的代码 for(Map.Entry<String,String>p:map.entrySet()){ String key=p.getKey(); // String value=p.getValue(); System.out.println(key); } } }