Java HashSet clear() Method with Examples

by Online Tutorials Library July 22, 2022

Java HashSet clear() Method

The clear() method of Java HashSet class is used to removes all of the elements from this set.

Syntax

Following is the declaration of clear() method:

Parameter

This method does not accept any parameter.

Returns

The clear() method does not return any value.

Exceptions:

Compatibility Version

Java 1.2 and above

Example 1

  import java.util.*;  public class HashSetClearExample1 {  public static void main(String[] args) {  //Create hash set        HashSet hset = new HashSet();              //Clear elements to hash set        hset.add(“JTP”);         hset.add(“SSSIT”);        hset.add(“DFC”);          //Checking elements in hash set        System.out.println(“Hash set Elements: “+ hset);        //Clear set values        hset.clear();        System.out.println(“Hash set elements after clear: “+ hset);         }  }  

Test it Now

Output:

Hash set Elements: [DFC, SSSIT, JTP]  Hash set elements after clear: []

Example 2

  import java.util.*;  public class HashSetClearExample2 {  public static void main(String[] args) {  //Create hash set        HashSet hset = new HashSet();              //Clear 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);        //Clear set values        hset.clear();        System.out.println(“Hash set elements after clear: “+ hset);         }  }  

Test it Now

Output:

Hash set Elements: [151, 121, 111]  Hash set elements after clear: []

Example 3

  import java.util.*;  public class HashSetClearExample3 {  public static void main(String[] args) {  //Create HashSet object              HashSet hset1 = new HashSet();                                    //Add elements to HashSet              hset1.add(“Facebook”);  hset1.add(“Twitter”);  hset1.add(“Instagram”);  hset1.add(“Google”);                     //Print the elements  System.out.println(“Size of the HashSet: “+hset1.size());              System.out.println(“Elements of the HashSet before clear:”);                    for(String val : hset1)              {                     System.out.println(val);              }                     hset1.clear();                     //Printing the elements after clear operation              System.out.println(“Elements of the HashSet after clear:”);              System.out.println(“Size of the hashset: “+hset1.size());              for(String val : hset1)              {                     System.out.println(val);              }        }  }  

Test it Now

Output:

Size of the HashSet: 4  Elements of the HashSet before clear:  Google  Twitter  Instagram  Facebook  Elements of the HashSet after clear:  Size of the hashset: 0

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Java HashSet clear() Method with Examples

Java HashSet clear() Method

Syntax

Parameter

Returns

Exceptions:

Compatibility Version

Example 1

Example 2

Example 3

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