BlockingQueue contains() method in Java with examples
Last Updated :
14 Oct, 2019
The contains(Object o) method of BlockingQueue interface checks if the passed element in the parameter exists in the container or not. It returns true if the element exists in the container else it returns a false value.
Syntax:
public boolean contains(Object o)
Parameters: This method accepts a mandatory parameter o whose presence in the container is to be checked in the container.
Returns: This method returns true if the element is present, else it returns false.
Note: The contains() method of BlockingQueue has been inherited from the Queue class in Java.
Below programs illustrate contains() method of BlockingQueue:
Program 1:
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.*;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
BlockingQueue<Integer> BQ
= new LinkedBlockingQueue<Integer>();
BQ.add( 10 );
BQ.add( 20 );
BQ.add( 30 );
BQ.add( 40 );
System.out.println( "Blocking Queue: " + BQ);
if (BQ.contains( 10 )) {
System.out.println( "Blocking Queue contains 10" );
}
else {
System.out.println( "Blocking Queue does not contain 10" );
}
}
}
|
Output:
Blocking Queue: [10, 20, 30, 40]
Blocking Queue contains 10
Program 2:
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.*;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
BlockingQueue<String> BQ
= new LinkedBlockingQueue<String>();
BQ.add( "ab" );
BQ.add( "cd" );
BQ.add( "fg" );
BQ.add( "xz" );
System.out.println( "Blocking Queue: " + BQ);
if (BQ.contains( "go" )) {
System.out.println( "Blocking Queue contains 'go'" );
}
else {
System.out.println( "Blocking Queue does not contain 'go'" );
}
}
}
|
Output:
Blocking Queue: [ab, cd, fg, xz]
Blocking Queue does not contain 'go'
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/LinkedBlockingQueue.html#contains(java.lang.Object)
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