Practical Quiz1_Advanced Java Lab_BCAE0270_2023

What is the output of this program?

import java.util.ArrayList;

public class ArrayListExample

{

    public static void main(String a[])

    {

        ArrayList<String> al = new ArrayList<String>();

        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

• None

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("Sonu");

        al.add("Ram");

        al.add("Hello");

        al.add("Sonu");

        al.add("Hello");

        al.add("Hello");

        al.add("Hello");

        System.out.println(al.indexOf("Hello"));

    }

}

• 6

• 2

• 5

• 4

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("Sonu");

        al.add("Ram");

        al.add("Hello");

        al.add("Sonu");

        al.add("Hello");

        al.add("Hello");

        al.add("Hello");

        System.out.println(al.lastIndexOf("Hello"));

    }

}

• 6

• 2

• 5

• 4

What is the output of this program?

import java.util.*;

public class ArrayListExample

{

      public static void main(String a[])

    {

        ArrayList al = new ArrayList();

        ArrayList a2 = new ArrayList();

        al.add("Sonu");

        a2.add(1);

        al.add("Ram");

        a2.add(2);

        al.add("Hello");

        a2.add(3);

        al.addAll(2, a2);

        System.out.println(al);

    }

}

• [Sonu, Ram, Hello, 1, 2, 3,]

• [Sonu, Ram, 1, 2, 3, Hello]

• [Sonu, 1, Ram, 2, 3, Hello]

• [Sonu, Ram, 1, 2, 3]

What is the output of this program?

import java.util.*;

public class ArrayListExample

{

     public static void main(String a[])

     {

        ArrayList al = new ArrayList();

        al.add("Sonu");

        al.add("Ram");

        al.add("Hello");

        System.out.println(al.size());

    }

}

• 10

• 2

• 3

• Compile Time Error

What is the output of this program?

import java.util.*;

public class ArrayListExample

{

     public static void main(String a[])

    {

        ArrayList al = new ArrayList();

        ArrayList a2 = new ArrayList();

        al.add("Sonu");

        a2.add(1);

        al.add("Ram");

        a2.add(2);

        al.add("Hello");

        a2.add(3);

        al.retainAll(a2);

        System.out.println(al);

    }

}

• [Sonu, Ram, Hello]

• [1, 2, 3]

• []

• Compile Time Error

What is the output of this program?

import java.util.*;

public class ArrayListExample

{

     public static void main(String a[])

    {

        ArrayList al = new ArrayList();

        ArrayList a2 = new ArrayList();

        al.add("Sonu");

        a2.add(1);

        al.add("Ram");

        a2.add(2);

        al.add("Hello");

        a2.add(3);

        al.clear();

        System.out.println(a2);

    }

}

• [1, 2, 3]

• []

• Compile Time Error

• RunTime Error

What is the output of this program?

import java.util.*;

public class ArrayListExample

{

     public static void main(String a[])

    {

        ArrayList al = new ArrayList();

        ArrayList a2 = new ArrayList();

        al.add("Sonu");

        a2.add(1);

        al.add("Ram");

        a2.add(2);

        al.add("Hello");

        a2.add(3);

        a2.set(1, "GLAU");

        System.out.println(a2);

    }

}

• [1, 2, 3]

• [1, GLAU, 3]

• [Sonu, GLAU, Hello]

• Compile Time 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 = it.next();

            if(x%2!=0)

            {

                it.remove();

            }

        }

        System.out.println(al);

    }

}

• [10, 20]

• [15, 25]

• Compile Time Error

• RunTime Error

What is the output of this program?

import java.util.ArrayList;

class ArrayListExample

{

     public static void main(String a[])

    {

        ArrayList al = new ArrayList();

        al.add(1);

        al.add(2);

        al.add(3);

        al.remove(1);

        System.out.println(al);

    }

}

• [1, 3]

• [2, 3]

• Compile Time Error

• A.RunTime Error