BCAE 1201_Programming in Advanced Java Theory Mid Term Quiz 2023

Which of these packages contain all the collection classes?

• java.lang

• java.util

• java.net

• java.awt

Which of these interface is not a part of Java’s collection framework?

• List

• Set

• SortedMap

• SortedList

Which of these methods deletes all the elements from invoking collection?

• clear()

• reset()

• delete()

• refresh()

What is Collection in Java?

• A group of objects

• group of classes

• A group of interfaces

• None of the mentioned

Which of these interface declares core method that all collections will have?

• Set

• EventListner

• Comparator

• Collection

Which of these interface handle sequences?

• Set

• List

• Comparator

• Collection

Which of the following is not a component in AWT?

• Button

• Checkbox

• Table

• TextArea

What is the output of this program?

import java.util.ArrayList;

import java.util.Iterator;

public class ArrayListExample

{

    public static void main(String a[])

    {

        ArrayList a1 = new ArrayList();

        ArrayList a2 = new ArrayList();

        a1.add("Hello");

        a1.add("10");

        a2.add("3");

        a2.add("4");

        System.out.println(a1);

        System.out.println(a2);

        a2.addAll(a1);

        System.out.println(a1);

        System.out.println(a2);

        a1.remove("Hello");

        System.out.println(a1);

        System.out.println(a2);

        a2.removeAll(a1);

        System.out.println(a1);

        System.out.println(a2);

    }

}

• [Hello, 10]

        [3, 4]

        [10]

        [3, 4, 10]

        [10]

        [3, 4, Hello, 10]

        [10]

        [3, 4, Hello]

• [Hello, 10]

        [3, 4]

        [Hello, 10]

        [3, 4, Hello, 10]

        [10]

        [3, 4, Hello, 10]

        [10]

        [3, 4, Hello]

• [Hello, 10]

        [3, 4]

        [10]

        [3, 4, 10]

        [10]

        [3, 4, Hello, 10]

        [10, 3, 4]

        [3, 4, Hello]

• [Hello, 10]

        [3, 4]

        [10]

        [3, 4, 10]

        [10]

        [3, 4, 10]

        [10, 3, 4]

        [3, 4, Hello]

What is the output of this program?

import java.util.ArrayList;

import java.util.Iterator;

public class ArrayListExample

{

    public static void main(String a[])

    {

        ArrayList a1 = new ArrayList();

        a1.add("10");

        a1.add("3");

        a1.add("4");

        a1.add(2,"10");

        System.out.println(a1);

    }

}

• [10, 3, 10]

• [10, 3, 10, 4]

• Compile Time Error

• RunTime Error

What is the output of this program?

import java.util.ArrayList;

public class ArrayListExample

{

    public static void main(String a[])

    {

        ArrayList al = new ArrayList();

       

        al.add(10);

        al.add(15);

        al.add(20);

        al.add(25);

        Iterator it = al.iterator();

        while(it.hasNext())

        {

            int x = (Integer)it.next();

            if(x%2!=0)

            {

                it.remove();

            }

        }

        System.out.println(al);

    }

}

• [10, 20]

• [15, 25]

• Compile Time Error

• RunTime Error