Question

What would be the output generated by the following code?
import java.util.concurrent.*;
public class Main {
public static void main(String[] args)
{
ConcurrentHashMap chm = new ConcurrentHashMap ();
chm.put(1, "Welcome");
chm.put(2, "to");
chm.put(3, "Java");
chm.put(4, "World");
chm.putIfAbsent (3, "World");
System.out.println("Elements: "+ chm);
chm. remove (2, "Welcome");
System.out.println("Elements after key 2 is removed
chm.putIfAbsent (3; "Java's");
System.out.println ("Add new: "+chm);
chm.replace(3, "Java", "Java New");
System.out.println("After Replacing: "+ chm);
}
}​

Answer 1

Answer:

Elements: {1=Welcome, 2=to, 3=Java, 4=World}

Elements after key 2 is removed

Add new: {1=Welcome, 2=to, 3=Java, 4=World}

After Replacing: {1=Welcome, 2=to, 3=Java New, 4=World}

Explanation:

Final Answer is After Replacing: {1=Welcome, 2=to, 3=Java New, 4=World}