public int start() returns start index of the previous match 

Which of the following methods releases the lock when they are executed?

Which of the following is not a valid comment type in Java?

 Wait(), notify(), notifyAll() must always be called in synchronized context otherwise IllegalMonitorStateException is thrown?

How to copy a file from one location to another?

What happens if a constructor is defined for an interface?

Which Java collection class allows you to access its elements by associating a key with an element's value, and provides synchronization?

what should be the output of this code block ?

 public class abekus {

  public static void function (int[] arr) {

   for (int i = 0; i < 5; i++)

    arr[i] = arr[i] * 2;

  }

  public static void main(String[] args) {

   int[] array = {

    1,

    2,

    3,

    4,

    5

   };

   function (array);

   for (int i = 0; i < 5; i++)

    System.out.print(array[i]);

  }

 }

Predict the output of the following Java code:

import java.util.*;

public class Abekus {

public static void main(String[] args) {

LinkedList l = new LinkedList();

l.add(23);

l.add(34);

l.add(55);

l.add(88);

l.add(94);

System.out.println(l.peekFirst());

System.out.println(l);

}

}