Java 集合 克隆HashMap

克隆HashMap的程序。我们将使用HashMap类的以下方法来执行克隆。
public Object clone()：返回此HashMap实例的浅表副本：未克隆键和值本身。

示例

import java.util.HashMap;
class HashMapExample{

  public static void main(String args[]) {

     // Create a HashMap
     HashMap<Integer, String> hmap = new HashMap<Integer, String>(); 

     // Adding few elements
     hmap.put(11, "Jack");
     hmap.put(22, "Rock");
     hmap.put(33, "Rick");
     hmap.put(44, "Smith");
     hmap.put(55, "Will");

     System.out.println("HashMap contains: "+hmap);

     // Creating a new HashMap
     HashMap<Integer, String> hmap2 = new HashMap<Integer, String>(); 

     // cloning first HashMap in the second one
     hmap2=(HashMap)hmap.clone();

     System.out.println("Cloned Map contains: "+hmap2); 
  } 
}

输出：

HashMap contains: {33=Rick, 55=Will, 22=Rock, 11=Jack, 44=Smith}
Cloned Map contains: {33=Rick, 55=Will, 22=Rock, 11=Jack, 44=Smith}