Java HashMap Sample

Java HashMap Sample
import java.util.*;
class TestHashMap
{
public static void main(String args[])
{
HashMap hm=new HashMap();
//store some Objects.
hm.put("Rajib Sarma","100");

//duplicate keys are not allowed.
hm.put("Rajib Sarma","200");//The value "100" is replaced by "200".
hm.put("Sazid Ahmed","200");

//Display the contents of the HashMap
System.out.println("Displaying all the keys/values.\r\n");
System.out.println("Key\t\tValue\r\n");

//get all the keys
Collection c=hm.keySet();

//obtain an Iterator
Iterator i=c.iterator();

while(i.hasNext())
{
//obtain a key
Object key=i.next();

//obtain the value of the key
Object value=hm.get(key);
System.out.println(key +"\t" + value);
}//while ends
}//main ends
}
示例
HashMap   staff   =   new   HashMap();
添加关键字值对，自己写
遍历  
Set     entries   =   staff.entrySet();
Iterator   iter   =   entries.iterator();
while(iter.hasNext())
{
      Map.Entry   entry   =   (Map.Entry)iter.next();
      Object   key   =   entry.getKey();得么关键字
      Object   value   =   entry.getValue();得到值
}