Java HashSet clone() 方法

30 Dec 2024 | 2 分钟阅读

Java HashSet 类的 clone() 方法用于返回指定 HashSet 的浅拷贝。

语法

以下是 clone() 方法的声明

参数

此方法不接受任何参数。

返回值

clone() 方法返回此 HashSet 的浅拷贝。

异常

不适用

兼容版本

Java 1.2 及以上版本

示例 1

import java.util.*;
public class HashSetCloneExample1 {
	public static void main(String[] args) {
		//Creating HashSet 
            HashSet<String> set = new HashSet<String>();
            //Add elements into the Set
            set.add("JavaTpoint");
            set.add("Google");
            set.add("Hindi100");
            set.add("101");
            set.add("Facebook"); 
            //Print the elements
            System.out.println("HashSet elements: " + set);
            //Creating a new cloned set
            HashSet<String> clonedSet = new HashSet<String>();
            //Clone the HashSet
            clonedSet = (HashSet)set.clone();
            //Displaying the new Set after Cloning;
            System.out.println("The new clone set elements: " + clonedSet);
	      }
}

输出

HashSet elements: [Google, 101, Hindi100, JavaTpoint, Facebook]
The new clone set elements: [Google, 101, JavaTpoint, Facebook, Hindi100]

示例 2

import java.util.*;
public class HashSetCloneExample2 {
	public static void main(String[] args) {
		//Create hash set
	      HashSet<Integer> hset = new HashSet<Integer>();      
	      //clone elements to hash set
	      hset.add(121); 
	      hset.add(111);
	      hset.add(151);  
	      //Checking elements in hash set
	      System.out.println("Hash set Elements: "+ hset);
            //Creating a new cloned set
            HashSet<Integer> clonedSet = new HashSet<Integer>();
            //Clone the HashSet
            clonedSet = (HashSet)hset.clone();
            //Displaying the new Set after Cloning;
            System.out.println("The new clone set elements: " + clonedSet);
	      }
}

输出

Hash set Elements: [151, 121, 111]
The new clone set elements: [121, 151, 111]

示例 3

import java.util.*;
public class HashSetCloneExample3 {
	public static void main(String[] args) {
		 //Create an empty HashSet
            HashSet<String> hset1 = new HashSet<>();       
            //Add elements to the HashSet
            hset1.add("JTP");
            hset1.add("SSSIT");
            hset1.add("DFC");
            //Print the elements of the HashSet
            System.out.println("Elements of the hset1:");
            for(String temp:hset1)
            {
                System.out.println(temp);
            }       
            //Create another HashSet
            HashSet<String> hset2 = new HashSet<>();
            //Shallow copying of hset1 to hset2
            hset2 =(HashSet)hset1.clone();       
            //Print the elements of the HashSet
            System.out.println("Elements of the hset2 after clone() operation:");
            for(String temp:hset2)
            {
                System.out.println(temp);
            }
	}
}

输出

Elements of the hset1:
DFC
SSSIT
JTP
Elements of the hset2 after clone() operation:
DFC
SSSIT
JTP

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Java HashSet clone() 方法

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Java HashSet clone() 方法

语法

参数

返回值

异常

兼容版本

示例 1

示例 2

示例 3

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