遍历Map方法二(用到Map.Entry内部类)
package michael.wlq;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
public class MapTest1 {
public static void main(String[] args) {
HashMap map = new HashMap();
map.put("a", "aa");
map.put("b", "bb");
map.put("c", "cc");
map.put("d", "dd");
Set set = map.entrySet();
for (Iterator iter = set.iterator(); iter.hasNext(); ) {
Map.Entry entry = (Map.Entry)iter.next(); // entry对象里面封装了key和value,使用此方法使用迭代一次就能获得两个值。
String key = (String)entry.getKey();
String value = (String)entry.getValue();
System.out.println(key + " : " + value);
}
}
}
输出结果为: