1.先来一个demo(参考链接:https://blog.csdn.net/wangliqiang1014/article/details/17002723)
public static void main(String[] args) { Map<String,String> map = new HashMap<String,String> (); map.put("1", "a"); map.put("2", "b"); map.put("3", "c"); Iterator iterator = map.keySet().iterator(); while (iterator.hasNext()) { String key = (String) iterator.next(); if ("1".equals(key) || "2".equals(key)) { iterator.remove(); //添加该行代码 map.remove(key); } } System.out.println(map.get("1")); System.out.println(map.get("2")); System.out.println(map.get("3")); System.out.println(map.get("4")); }
2.下面将以上操作改写成工具方法
import org.apache.commons.lang3.ArrayUtils; import java.util.Iterator; import java.util.Map; public class MapUtil { /** * Map中根据key批量删除键值对 * @param map * @param excludeKeys * @param <K> * @param <V> * @return */ public static <K, V> Map removeEntries(Map<K, V> map, String[] excludeKeys) { Iterator<K> iterator = map.keySet().iterator(); while (iterator.hasNext()) { K k = iterator.next(); // 如果k刚好在要排除的key的范围中 if (ArrayUtils.contains(excludeKeys, k)) { iterator.remove(); map.remove(k); } } return map; } }
3.调用
将demo中的第6-13行换成下面的即可
MapUtil.removeEntries(map, new String[]{"1", "2"});