package s;import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;public class HashMapTest {
public static void printElements(Collection c)
{
Iterator it=c.iterator();
while(it.hasNext())
{
System.out.println(it.next());
}
}
public static void main(String[] args)
{
HashMap<Object,Object> hm=new HashMap<Object,Object>();
hm.put("one","zhangsan");
hm.put("two","lisi");
hm.put("three","wangwu");
Set entry=hm.entrySet();
//printElements(entry);
Iterator it=entry.iterator();
while(it.hasNext());
{
Map.Entry me=(Map.Entry)it.next();
System.out.println(me.getKey()+":"+me.getValue());
}
}
}
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;public class HashMapTest {
public static void printElements(Collection c)
{
Iterator it=c.iterator();
while(it.hasNext())
{
System.out.println(it.next());
}
}
public static void main(String[] args)
{
HashMap<Object,Object> hm=new HashMap<Object,Object>();
hm.put("one","zhangsan");
hm.put("two","lisi");
hm.put("three","wangwu");
Set entry=hm.entrySet();
//printElements(entry);
Iterator it=entry.iterator();
while(it.hasNext());
{
Map.Entry me=(Map.Entry)it.next();
System.out.println(me.getKey()+":"+me.getValue());
}
}
}
while(it.hasNext());
{
Map.Entry me=(Map.Entry)it.next();
System.out.println(me.getKey()+":"+me.getValue());
}
那“while(it.hasNext());”后面多了个分号