Map日常--遍历Map,Map转Lis

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本次练习涉及到：

将Map转换为List类型
遍历Map

package Collection;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;/** * 将Map转换为List类型 * @author my * */public class MapTest {static Map map = null;public static void main(String[] args) {MapTest t =new MapTest();t.createMap();t.MapToList(map);}public void createMap(){map = new HashMap();map.put("key1", "value1");map.put("key2", "value2");map.put("key3", "value3");map.put("key4", "value4");map.put("key5", "value5");}public void MapToList(Map map){// key listList keyList = new ArrayList(map.keySet());this.printList(keyList);// value listList valueList = new ArrayList(map.values());this.printList(valueList);// key-value listList entryList = new ArrayList(map.entrySet());this.printList(entryList);}public void printList(List list) {for(int i = 0;i<list.size();i++){System.out.println(list.get(i));}}}

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