The clear() of java.util.Collection interface is used to clear the Collection upon which it is called. This method does not take any parameter and does not returns any value.
Syntax:
Collection.clear()
Parameters: This method do not accept any parameter
Return Value: This method does not return any value.
Exceptions: This method throws following exceptions:
- UnsupportedOperationException: if the add operation is not supported by this collection
Below examples illustrate the Collection clear() method:
Example 1: Using LinkedList Class
import java.io.*;
import java.util.*;
public class GFG {
public static void main(String args[])
{
Collection<String> list = new LinkedList<String>();
list.add( "Geeks" );
list.add( "for" );
list.add( "Geeks" );
System.out.println( "The list is: " + list);
list.clear();
System.out.println( "The new List is: " + list);
}
}
|
Output:
The list is: [Geeks, for, Geeks]
The new List is: []
Example 2: Using ArrayDeque Class
import java.util.*;
public class ArrayDequeDemo {
public static void main(String args[])
{
Collection<String> de_que = new ArrayDeque<String>();
de_que.add( "Welcome" );
de_que.add( "To" );
de_que.add( "Geeks" );
de_que.add( "4" );
de_que.add( "Geeks" );
System.out.println( "ArrayDeque: " + de_que);
de_que.clear();
System.out.println( "The new ArrayDeque is: "
+ de_que);
}
}
|
Output:
ArrayDeque: [Welcome, To, Geeks, 4, Geeks]
The new ArrayDeque is: []
Example 3: Using ArrayList Class
import java.io.*;
import java.util.*;
public class ArrayListDemo {
public static void main(String[] args)
{
Collection<Integer> arrlist = new ArrayList<Integer>( 5 );
arrlist.add( 15 );
arrlist.add( 20 );
arrlist.add( 25 );
System.out.println( "ArrayList: " + arrlist);
arrlist.clear();
System.out.println( "The new ArrayList is: "
+ arrlist);
}
}
|
Output:
ArrayList: [15, 20, 25]
The new ArrayList is: []
Reference: https://docs.oracle.com/javase/9/docs/api/java/util/Collection.html#clear–
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Last Updated :
29 Nov, 2018
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