Java HashMap clear() 方法
定义和用法
clear()
方法会从映射(map)中移除所有条目。
相关页面
教程:Java HashMap
实例
从映射中移除所有项:
import java.util.HashMap; public class Main { public static void main(String[] args) { HashMap<String, String> capitalCities = new HashMap<String, String>(); capitalCities.put("China", "Beijing"); capitalCities.put("England", "London"); capitalCities.put("Germany", "Berlin"); capitalCities.put("USA", "Washington DC"); capitalCities.clear(); System.out.println(capitalCities); } }
语法
public void clear()