import java.util.*;
public class student
{
/**
* Method main
*
*
* @param args
*
*/
public static void main(String[] args)
{
// TODO: Add your code here
HashMap ha= new HashMap();
ha.put("200502",new st("200502","王g刚",95));
ha.put("200501",new st("200501","王小敏",95));
Iterator it=ha.keySet().iterator();
while(it.hasNext())
{
st ss=(st)it.next();
System.out.println(ss.name);
}
}
class st
{
int english=0;
String name,number;
st(String name,String number,int english)
{
this.name=name;
this.number=number;
this.english=english;
}
}
public class student
{
/**
* Method main
*
*
* @param args
*
*/
public static void main(String[] args)
{
// TODO: Add your code here
HashMap ha= new HashMap();
ha.put("200502",new st("200502","王g刚",95));
ha.put("200501",new st("200501","王小敏",95));
Iterator it=ha.keySet().iterator();
while(it.hasNext())
{
st ss=(st)it.next();
System.out.println(ss.name);
}
}
class st
{
int english=0;
String name,number;
st(String name,String number,int english)
{
this.name=name;
this.number=number;
this.english=english;
}
}
改成 Iterator it=ha.values().iterator();
改为: Iterator it=ha.values().iterator();
就OK了
st(String name,String number,int english)
Iterator it=ha.values().iterator();
while(it.hasNext())
{
String ss=(String)it.next();
String name=((st)ha.get(ss)).name;
System.out.println(name);
}不过还是要说一句,你也够大意的!呵呵……
改为
st ss=(st)ha.get(it.next());