21.Map
发表日期:2022-08-05 16:33:10 | 来源: | | 浏览(636) 分类:JAVA基础
MapDemo01
import java.util.HashMap; import java.util.Map; public class MapDemo01 { public static void main(String[] args) { // TODO 自动生成的方法存根 Map<String, String> map = new HashMap<String, String>(); map.put("name", "zhangsan"); map.put("work", "techer"); } }
HashMapDemo01
import java.util.HashMap; import java.util.Iterator; import java.util.Set; public class HashMapDemo01 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub HashMap<String, String> map = new HashMap<String, String>();//HashMap => TreeMap = sort map.put("百度", "www.baidu.com"); map.put("腾讯", "www.qq.com"); map.put("网易", "www.163.com"); if (map.containsKey("百度")) { System.out.println(map.get("百度")); } Set<String> keys = map.keySet();//Collection<String> keys = map.values(); Iterator<String> iterator = keys.iterator(); while (iterator.hasNext()) { String str = iterator.next(); System.out.print(str+"\\"); } } }
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