JAVA中的Map

package lys;import java.util.HashMap;import java.util.Iterator;import java.util.Map;import java.util.TreeMap;public class Test {/** * 测试map接口 */public void TestMap() {Map trMap = new TreeMap();//trMap.put("12", "10");// System.out.println(trMap);Map map = new HashMap();map.put("1", "zs");map.put("2", "w5");map.put("3", "w5");map.put("5", "w5");map.put("7", "w5");map.put("4", "w5");Iterator entri = map.entrySet().iterator(); //迭代器while (entri.hasNext()) {Map.Entry entry = (java.util.Map.Entry) entri.next();String key = (String) entry.getKey(); //取出KEYSystem.out.println(key);}}public static void main(String[] args) {new Test().TestMap();}}