Practice Exam for JAVA Terminal

Questions 1: Select the right option. (10)
    1) Every enum constant is always implicitly
        a) public
        2) static
        3) final
        4) all three.

    2) A layout is placed on ____ to be displayed. (JavaFX)
        a) Stage
        b) Scene
        c) Group
        d) Parent

    3) Button class is a subclass of ____
        a) Node
        b) Label
        c) Scene
        d) Window

    4) We can create a reference variable of ____
        a) Class
        b) Interface
        c) Both

    5) Can we use the instance variable of class in that static variable of the same class?
        a) Yes
        b) No
        c) We need to create its object
        d) Just using class name would work.

    6) Static methods can refer to
        a) this
        b) super
        c) none of these
        d) both

    7) Which of these are valid in an interface
        a) static int x() { /*MuHaHaHa*/}
        b) int x = 0;
        c) double hello();
        d) all of these.
        e) none of these.

    8) Which exception must be caught if it's thrown by a method
        a) Run time Exception.
        b) Compile time Exception.
        c) None.
        d) Both.

    9) JCheckBox specialty is:
        a) Only one in the group can be selected.
        b) All can be selected at once.
        c) They make a beep sound when selecting by default.
        d) none just like normal list selection buttons.

    10) What can be used for placing the components in java swing:
        a) JPane
        b) JFrame
        c) JTextArea
        d) a and b.
        e) a and c.
        f) a,b and c.
        g) none.

Question 2: Short questions (6)
    What is the difference between VBox, HBox, and StackPane (JavaFX)? (3)

    What is the difference between ArrayList and simple array, how to declare it and give its example? (3)

Question 3: Find the compile-time errors and fix them (10)

    Code 1: (2)
        public static int sum(int x, int y) throws IOException
        {
            throw new IOException("Error ha");
        }

        public static void main(String args[])
        {
            sum(1,2);
        }

    Code 2: (2)
        float f = 8.0;
        double d = 7.0;
        int i = 0;

        public void justAnMethod() {
            System.out.printf("%f,%d,%i",f,d,i);
        }

    code 3: (2)
        import javax.swing.*;
        import java.awt.event.ActionListener;

        public class MyFrame extends JFrame implements ActionListener
        {
            public MyFrame()
            {
                super();

            }
        }

    code 4: (4)
        public interface A {
            void hello();
        }

        public class B {
            abstract public void bye();
        }

        public class C extends B implements A {
            public void hello() {
                return;
            }
        }

        public class D extends C implements A {
            @Override
            public void bye() {

            }

            @Override
            public void hello() {

            }
        }

Question 4: (4)
    Your connection has been established to the database and stored in variable 'connection';
    Store data in table and then load all the data.
    When you have loaded all the data print only the data which you just added.
    Queries to use:
        For Saving:
            INSERT INTO Account (Name,Pass,Date) VALUES ('Arose','Niazi',NOW())
        For Loading:
            SELECT * FROM Account


Question 5: (10)
    Write a paint program, keep it simple just too one color.

Question 6: (10)
    Determine the output

    Code 1: (2)
        public class A {
            public static void main(String[] args)
            {
                if (true)
                break;
            }
        }

    Code 2: (2)
        class Test1 {
            Test1(int x) {
                System.out.println("Constructor called " + x);
            }
        }

        class Test2 {
            Test1 t1 = new Test1(10);

            Test2(int i) { t1 = new Test1(i); }

            public static void main(String[] args) {
                    Test2 t2 = new Test2(5);
            }
        }

    Code 3: (2)
        class Test2 {
            public static void main(String[] args)
            {
                int arr[][] = { { 11, 22 }, { 33, 44, 55 } };
                for (int i = 0; i < 2; i++) {
                    for (int j = 0; j < arr.length; j++)
                        System.out.print(arr[i][j] + " ");
                    System.out.println();
                }
            }
        }

    Code 4: (2)
        interface A
        {
            void myMethod();
            void getInfo();
        }

        abstract class B implements A
        {
            void getData()
            {
                System.out.println("A");
            }
        }

        public class Test extends B
        {
            public void myMethod()
            {
                System.out.println("D");
            }
            public void getInfo()
            {
                System.out.println("B");
            }

            public static void main(String[] args)
            {
                B obj = new Test();
                obj.getInfo();
            }
        }

    Code 5:
        public static void main(String args[])
        {
            boolean b[] = new boolean[52];
            b[26]=true;
            while(!b[b.length/2])
            {
                System.out.print("***");
            }
            int x=0;
            while (true)
            {
                if(++x < 5) System.out.print("A");
                else break;
            }
            for(x=b.length/2-2; x<b.length; x++)
            {
                if(b[x])
                {
                    System.out.print("***");
                    break;
                }
                else
                    System.out.print("B");
            }

        }