import java.util.*;
public class TestHash{
public static void main(String[] args) {
Map map = new HashMap();
map.put("1", "value1");
map.put("2", "value2");
map.put("3", "value3");
//第一ç§ï¼šæ™®é使用，二次å–值
System.out.println("通过Map.keySeté历keyå’Œvalue：");
for (String key : map.keySet()) {
System.out.println("key= "+ key + " and value= " + map.get(key));
}
//第二ç§
System.out.println("通过Map.entrySet使用iteratoré历keyå’Œvalue：");
Iterator> it = map.entrySet().iterator();
while (it.hasNext()) {
Map.Entry entry = it.next();
System.out.println("key= " + entry.getKey() + " and value= " + entry.getValue());
}
//第三ç§ï¼šæŽ¨è，尤其是容é‡å¤§æ—¶
System.out.println("通过Map.entrySeté历keyå’Œvalue");
for (Map.Entry entry : map.entrySet()) {
System.out.println("key= " + entry.getKey() + " and value= " + entry.getValue());
}
//第四ç§
System.out.println("通过Map.values()é历所有的value，但ä¸èƒ½é历key");
for (String v : map.values()) {
System.out.println("value= " + v);
}
System.out.println(map.toString());
}
}