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:
// Java Program to illustrate the CopyOnWriteArraySet // contains() method in Java import java.util.concurrent.CopyOnWriteArraySet;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// create object of CopyOnWriteArraySet
CopyOnWriteArraySet<Integer> ArrSet
= new CopyOnWriteArraySet<Integer>();
// Add elements
ArrSet.add( 32 );
ArrSet.add( 67 );
ArrSet.add( 67 );
ArrSet.add( 100 );
// print CopyOnWriteArraySet
System.out.println( "CopyOnWriteArraySet: "
+ ArrSet);
// check if 100 is present
// using contains() function
if (ArrSet.contains( 100 ))
System.out.println( "100 is "
+ "present in the Set" );
else
System.out.println( "100 is "
+ "not present in the Set" );
// check if 20 is present
// using contains() function
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:
// Java Program to illustrate the CopyOnWriteArraySet // contains() method in Java import java.util.concurrent.CopyOnWriteArraySet;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// create object of CopyOnWriteArraySet
CopyOnWriteArraySet<String> ArrSet
= new CopyOnWriteArraySet<String>();
// Add elements
ArrSet.add( "geeks" );
ArrSet.add( "gfg" );
ArrSet.add( "jgec" );
ArrSet.add( "sudo" );
// print CopyOnWriteArraySet
System.out.println( "CopyOnWriteArraySet: "
+ ArrSet);
// check using contains() function
if (ArrSet.contains( "gfg" ))
System.out.println( "gfg is "
+ "present in the Set" );
else
System.out.println( "gfg is "
+ "not present in the Set" );
// check using contains() function
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