Java中, IdentityHashMap clone()的方法

作者: Arvin Chen 分类: Java 来源: Break易站(www.breakyizhan.com)

Java.util.IdentityHashMap.clone()

java.util.IdentityHashMap.clone() 方法用于返回所提到的哈希映射的副本。它只是创建了map的副本。

句法:

Identity_HashMap.clone()

参数:该方法不接受任何参数。

返回值:该方法只返回哈希映射的副本。

下面的程序用于说明java.util.IdentityHashMap.clone() 的工作方法

程序1:

// Java code to illustrate the clone() method
import java.util.*;

public class Identity_Hash_Map_Demo {
    public static void main(String[] args)
    {

        // Creating an empty IdentityHashMap
        IdentityHashMap<Integer, String> identity_hash = 
                      new IdentityHashMap<Integer, String>();

        // Mapping string values to int keys
        identity_hash.put(10, "Geeks");
        identity_hash.put(15, "4");
        identity_hash.put(20, "Geeks");
        identity_hash.put(25, "Welcomes");
        identity_hash.put(30, "You");

        // Displaying the IdentityHashMap
        System.out.println("Initial Mappings are: " + 
                                            identity_hash);

        // Displaying the cloned Map using clone()
        System.out.println("The cloned map: " + 
                                    identity_hash.clone());
    }
}

输出:

Initial Mappings are: {10=Geeks, 30=You, 20=Geeks, 25=Welcomes, 15=4}
The cloned map: {10=Geeks, 30=You, 20=Geeks, 25=Welcomes, 15=4}

程序2:

// Java code to illustrate the clone() method
import java.util.*;

public class Identity_Hash_Map_Demo {
    public static void main(String[] args)
    {

        // Creating an empty hash map
        IdentityHashMap<String, Integer> identity_hash = 
                  new IdentityHashMap<String, Integer>();

        // Mapping int values to string keys
        identity_hash.put("Geeks", 10);
        identity_hash.put("4", 15);
        identity_hash.put("Geeks", 20);
        identity_hash.put("Welcomes", 25);
        identity_hash.put("You", 30);

        // Displaying the IdentityHashMap
        System.out.println("Initial Mappings are: " + 
                                         identity_hash);

        // Displaying the cloned map using clone()
        System.out.println("The cloned map: " + 
                                 identity_hash.clone());
    }
}

输出:

Initial Mappings are: {Geeks=20, Welcomes=25, You=30, 4=15}
The cloned map: {Geeks=20, Welcomes=25, You=30, 4=15}
  •   本文标题:Java中, IdentityHashMap clone()的方法 - Break易站
    转载请保留页面地址:https://www.breakyizhan.com/java/5334.html
      微信返利机器人
      免费:淘宝,京东,拼多多优惠券
      腾讯,爱奇艺,优酷的VIP视频免费解析,免费看
      即刻扫描二维码,添加微信机器人!

    发表笔记

    电子邮件地址不会被公开。 必填项已用*标注