hashset java_Java HashSet clone（）方法与示例

hashset java

HashSet类clone()方法 (HashSet 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 returns a shallow copy of this HashSet. clone()方法用于返回此HashSet的浅表副本。 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()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。 clone() method does not throw an exception at the time of cloning an object. clone()方法在克隆对象时不会引发异常。

Syntax:

句法：

public Object clone();

Parameter(s):

参数：

It does not accept any parameter. 它不接受任何参数。

Return value:

返回值：

The return type of the method is Object, it returns cloned copy of this HashSet.

该方法的返回类型为Object ，它返回此HashSet的克隆副本。

Example:

例：

// Java program to demonstrate the example 
// of Object clone() method of HashSet 

import java.util.*;

public class CloneOfHashSet {
          
   
    public static void main(String[] args) {
          
   
        // Instantiates a HashSet object
        HashSet < String > hs = new HashSet < String > ();
        HashSet < String > clone_set = new HashSet < String > ();

        // By using add() method is to add
        // the given object of this
        // HashSet 
        hs.add("C");
        hs.add("C++");
        hs.add("JAVA");
        hs.add("PHP");
        hs.add("SFDC");

        // Display HashSet
        System.out.println("HashSet: " + hs);
        System.out.println("Clone HashSet: " + clone_set);

        // By using clone() method is to
        // clone this HashSet
        clone_set = (HashSet) hs.clone();

        // Display Cloned HashSet
        System.out.println("hs.clone(): " + clone_set);
    }
}

Output

输出量

HashSet: [JAVA, C++, C, SFDC, PHP]
Clone HashSet: []
hs.clone(): [JAVA, PHP, C++, C, SFDC]

翻译自:

hashset java

hashset java HashSet类clone()方法 (HashSet 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 returns a shallow copy of this HashSet. clone()方法用于返回此HashSet的浅表副本。 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()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。 clone() method does not throw an exception at the time of cloning an object. clone()方法在克隆对象时不会引发异常。 Syntax: 句法： public Object clone(); Parameter(s): 参数： It does not accept any parameter. 它不接受任何参数。 Return value: 返回值： The return type of the method is Object, it returns cloned copy of this HashSet. 该方法的返回类型为Object ，它返回此HashSet的克隆副本。 Example: 例： // Java program to demonstrate the example // of Object clone() method of HashSet import java.util.*; public class CloneOfHashSet { public static void main(String[] args) { // Instantiates a HashSet object HashSet < String > hs = new HashSet < String > (); HashSet < String > clone_set = new HashSet < String > (); // By using add() method is to add // the given object of this // HashSet hs.add("C"); hs.add("C++"); hs.add("JAVA"); hs.add("PHP"); hs.add("SFDC"); // Display HashSet System.out.println("HashSet: " + hs); System.out.println("Clone HashSet: " + clone_set); // By using clone() method is to // clone this HashSet clone_set = (HashSet) hs.clone(); // Display Cloned HashSet System.out.println("hs.clone(): " + clone_set); } } Output 输出量 HashSet: [JAVA, C++, C, SFDC, PHP] Clone HashSet: [] hs.clone(): [JAVA, PHP, C++, C, SFDC] 翻译自: hashset java