又一道HashMap简单例子

最新推荐文章于 2024-01-27 22:40:01 发布

最新推荐文章于 2024-01-27 22:40:01 发布 · 237 阅读

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本文通过一个Java示例展示了如何使用HashMap来存储和检索电话号码。包括添加条目、遍历键值对、复制映射以及移除条目的操作。

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java 代码

public class HashMapDemo{
public static void main(String [] args){
HashMap emPhone = new HashMap();
emPhone.put("Ashish","111-222-3333");
emPhone.put("Archit","444-555-6666");
emPhone.put("Prashant","777-888-9999");
Set keys = emPhone.keySet();//Set类可以获取HashMap对象的键。
Iterator keyIter = keys.iterator();
while(keyIter.hasNext()){
String nextName = (String)keyIter.next();
String phoneNum = (String)emPhone.get(nextName);
System.out.println(nextName + ":" + phoneNum);
}
String phoneName = (String)emPhone.remove("Ashish");
System.out.println("Removed Ashish's number :" + phoneName);
HashMap newEmpPhone = new HashMap();
newEmpPhone.putAll(emPhone);
int dirSize = newEmpPhone.size();
System.out.println("Created new phone directory with " + dirSize + " numbers...");
phoneName = (String)newEmpPhone.get("Prashant");
System.out.println("Prashant's number in new director: " + phoneName);
}
}