CopyOnWriteArraySet contains() method in Java
The contains(E e) method of CopyOnWriteArraySet checks if a given element is present in the Set or not.
Syntax:
public boolean contains(Object o)
Parameters: The function accepts a single mandatory parametero which specifies the element whose appearance is to be checked in the Set.
Return Value: The function returns true if the element is present else it returns false.
Below programs illustrate the above function:
Program 1:
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
CopyOnWriteArraySet<Integer> ArrSet
= new CopyOnWriteArraySet<Integer>();
ArrSet.add( 32 );
ArrSet.add( 67 );
ArrSet.add( 67 );
ArrSet.add( 100 );
System.out.println( "CopyOnWriteArraySet: "
+ ArrSet);
if (ArrSet.contains( 100 ))
System.out.println( "100 is "
+ "present in the Set" );
else
System.out.println( "100 is "
+ "not present in the Set" );
if (ArrSet.contains( 20 ))
System.out.println( "20 is "
+ "present in the Set" );
else
System.out.println( "20 is "
+ "not present in the Set" );
}
}
|
Output:
CopyOnWriteArraySet: [32, 67, 100]
100 is present in the Set
20 is not present in the Set
Program 2:
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
CopyOnWriteArraySet<String> ArrSet
= new CopyOnWriteArraySet<String>();
ArrSet.add( "geeks" );
ArrSet.add( "gfg" );
ArrSet.add( "jgec" );
ArrSet.add( "sudo" );
System.out.println( "CopyOnWriteArraySet: "
+ ArrSet);
if (ArrSet.contains( "gfg" ))
System.out.println( "gfg is "
+ "present in the Set" );
else
System.out.println( "gfg is "
+ "not present in the Set" );
if (ArrSet.contains( "best" ))
System.out.println( "best is "
+ "present in the Set" );
else
System.out.println( "best is "
+ "not present in the Set" );
}
}
|
Output:
CopyOnWriteArraySet: [geeks, gfg, jgec, sudo]
gfg is present in the Set
best is not present in the Set
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CopyOnWriteArraySet.html#contains-java.lang.Object-
Last Updated :
26 Nov, 2018
Like Article
Save Article
Share your thoughts in the comments
Please Login to comment...