hashmap clone

HashMap類clone()方法 (HashMap Class clone() method)

• clone() method is available in java.util package.

  clone()方法在java.util包中可用。

• clone() method is used to get a cloned copy of this HashMap instance or in other words, we can say it returns a shallow copy of this HashMap.

  clone()方法用于獲取此HashMap實例的克隆副本，換句話說，可以說它返回此HashMap的淺表副本。

• clone() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  clone()方法是一個非靜態(tài)方法，只能通過類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

• clone() method does not throw an exception at the time of cloning an object.

  clone()方法在克隆對象時不會引發(fā)異常。

Syntax:

句法：

public Object clone();

Parameter(s):

參數(shù)：

• It does not accept any parameter.

  它不接受任何參數(shù)。

Return value:

返回值：

The return type of the method is Object, it clones this HashMap.

該方法的返回類型為Object ，它將克隆此HashMap。

Example:

例：

// Java program to demonstrate the example // of Object clone() method of HashMap import java.util.*;public class CloneOfHashMap {public static void main(String[] args) {// Instantiates a HashMap objectHashMap < Integer, String > hm = new HashMap < Integer, String > ();HashMap < Integer, String > clone_map = new HashMap < Integer, String > ();// By using put() method is to add// key-value pairs in a TreeMaphm.put(10, "C");hm.put(20, "C++");hm.put(50, "JAVA");hm.put(40, "PHP");hm.put(30, "SFDC");// Display HashMap and clone_mapSystem.out.println("HashMap: " + hm);System.out.println("CloneMap: " + clone_map);// By using clone() method is to clone// this objectclone_map = (HashMap) hm.clone();//Display clone_mapSystem.out.println("hm.clone(): " + clone_map);} }

Output

輸出量

HashMap: {50=JAVA, 20=C++, 40=PHP, 10=C, 30=SFDC} CloneMap: {} hm.clone(): {40=PHP, 50=JAVA, 10=C, 20=C++, 30=SFDC}

翻譯自: https://www.includehelp.com/java/hashmap-clone-method-with-example.aspx

hashmap clone

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