INDIAN LEARNERS OWN ACADEMY, KUWAIT Informatics Practices XII Holiday Homework. b. What is the importance of abstract classes in programming?

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1 INDIAN LEARNERS OWN ACADEMY, KUWAIT Informatics Practices XII Holiday Homework 1. a. Define the term Polymorphism. What are the two ways polymorphism is demonstrated in Java? b. What is the importance of abstract classes in programming? c. Write a short note on Operator overloading and Method Overloading citing examples for both. d. Carefully study the code given below: String Message = "Hello! How are you?", Msg1, Msg2; Msg1 = Message.substring(7); Msg2 = Message.substring(0,5); What will be the contents of the variables Msg1 and Msg2 after the above statements are executed? 2 a. Zia is working with list box. She has placed a list control on her form to display the list of all items available in her shop. She wants to allow the user to select multiple items from her list control. Which property of jlist should she use to do the same? b. Differentiate between Procedural Programming paradigm and the Object Oriented Programming paradigm c. What is a class? d. Name the 3 essential class libraries that we need to import for setting up the connection with the database and retrieve data from the database. e. Design a GUI application in which the user enters a number in the text field and on clicking the button the sum of the digits of the number should be displayed in a label. Hint : Suppose user enters 123 the output should be 6(1+2+3). 3. a. Design a GUI application to accept a character in a text field and print in a label if that character is a vowel: a, e, i, o, or u. The application should be case sensitive. b. Design a GUI application to reverse the given number and also find out whether the number is a palindrome or not. c. Write the output produced by the following SQL commands: 1. SELECT POW(4,3), POW(3,4); 2. SELECT ROUND( ,2), ROUND( ), ROUND( ,-1); 3. SELECT TRUNCATE( ,2), TRUNCATE( ,-1); 4. SELECT LENGTH("Prof. M. L. Sharma"); 5. SELECT CONCAT("SHEIKH", " HAROON") "FULL NAME"; 6. SELECT YEAR(CURDATE()), MONTH(CURDATE()), DAY(CURDATE());

2 7. SELECT DAYOFYEAR(CURDATE()), DAYOFMONTH(CURDATE()), DAYNAME(CURDATE()); 8. SELECT LEFT("Unicode",3), RIGHT("Unicode",4); 9. SELECT INSTR("UNICODE","CO"), INSTR("UNICODE","CD"); 10. SELECT MID("Informatics",3,4), SUBSTR("Practices",3); 4. a. Rewrite the following code using while loop: int a,b; for(a=10,b=4;a<=16;a++,b+=2){ jtextarea1.append(""+a++);} JOptionPane.showMessageDialog(null,"Finished!!!"); b. What will be displayed in jtextarea1 after the execution of the following loop? for (int I=5;I>=2;I ) jtextarea1.settext(jtextarea1.gettext() + " "+Integer.toString(I*I)); c. What will be the values of num and num1 after execution of the following code: int num,num1=0; for(num=100;num<=101;num++) { num1= num+2; --num1; } d. What will be the value of count and x after execution of the following code? int count=0,x=9; count=x- -; do { count+=x - -; }while(x>6); System.out.println("Count # " + count + " X # "+ x); 5 i What will be the contents of jteftfield1 after executing the following code: String str = Mahatma ; jtextfield1.settext( str.substring(4)); ii. The following code has some error(s). Rewrite the correct code underlining all the corrections made int z; z = 14; do; z = z-2; System.out.displayln(z); }while z >= 2;

iii. Raman has typed the following code: int ch=integer.parseint(jtextfield1.gettext()); switch(ch) { case 1:jTextField2.setText("Service"); case 2: jtextfield2.

3 iii. Raman has typed the following code: int ch=integer.parseint(jtextfield1.gettext()); switch(ch) { case 1:jTextField2.setText("Service"); case 2: jtextfield2.settext("complaint"); case 3: jtextfield2.settext("operator"); break; default: jtextfield2.settext("not a valid entry"); } On entering the value 1, 2 or 3, he is getting the same output. Mention the possible reason for the same. 6 a. Richika is a programmer at Alpha Builders. To calculate wages to be paid to labourers she has developed the following GUI in Netbeans. i ii b Male and Female labourers are respectively paid at the rate of Rs. 140/- per day and Rs. 160/-per day. Skilled labourers are paid extra at the rate of Rs. 50/- per day002e What should be done so that only one of the radio buttons (Male and Female) can be selected at a time? Write Java code to do the following. a. Calculate and display the Total Wages in the corresponding label when the Calculate Wages button is pressed. b. Clear the Name and No. of Days worked Text Fields. c. Close the application when the Stop button is pressed. Mr. Rangaswami works at a Recreation Park as a system analyst. He has created the following GUI. When a group arrives at the Recreation Park, the number of people in the group and whether the group wants to enjoy the Water Park or not is entered. Entry fees is < 500 per person. The person can choose to play at Water Park by selecting the checkbox. Rides of Water Park will cost < 250 extra per person.

i ii c Help him to write code for the following : On the click of command button Calculate, textfield for Entry Fees should display Entry Fees per person X Number of

Textfield for Total Amount should display sum of Entry Fees and Water Park Charges for all the people in the group.

4 i ii c Help him to write code for the following : On the click of command button Calculate, textfield for Entry Fees should display Entry Fees per person X Number of people. If Water Park checkbox is selected, textfield for Water Park Charges should display Water Park Charges per person X Number of people. Textfield for Total Amount should display sum of Entry Fees and Water Park Charges for all the people in the group. Write Java code to clear all Textboxes on the click of Clear button. Write Java code to close the application on the click of Exit button. Ms. Rakhi works in an International Bank as an IT Head. She designed a simple interest calculator program as shown below:

i The interest rate is given based on the account type as shown below: ACCOUNT TYPE INTEREST RATE % SAVING 4% RECURRING DEPOSIT 6% FIXED DEPOSIT 8% Write the code required for INTEREST RATE button to

5 i The interest rate is given based on the account type as shown below: ACCOUNT TYPE INTEREST RATE % SAVING 4% RECURRING DEPOSIT 6% FIXED DEPOSIT 8% Write the code required for INTEREST RATE button to display interest rate as per the above given criteria. ii iii d Write the code required for SI button to calculate and display Simple Interest based on the given formulae: SI=(amount*interest_rate*duration)/100; Write the code required for CLEAR ALL to clear all the textfields. Ms. Sheela works in a shopping mall. To calculate net payable amount she has developed the following GUI in NetBeans. The shop accepts payments in three modes- Cash, Debit Card, Credit Cards. The discount given as per mode of payment is as follows: Mode of payment Discount Cash 12% Debit Card Nil Credit Card 8% i ii If the Member check box is checked then the customer gets an additional discount of 5% on net payable amount. Write the code to make the textfields for Discount ( txtdiscount ) and Net Payable (txtnetpayable) uneditable. Write code to do the following a) When Calculate button is clicked the discount and net payable amount is calculated as per the given criteria and displayed in discount and net payable text boxes. b) When Clear button is clicked all the text boxes should be clear. c) Close the application when Exit button is pressed.

condition: If the Basic is less than 50000 then IncomeTax = Basic*0.2 And if it is greater than or equal to 50000 then IncomeTax=Basic *0.

6 e Shekhar is a junior programmer at ducom Enterprises. He created the following GUI in Netbeans. i ii iii f i Help him to write code for the following : To calculate Income Tax to be paid and display in jtextfield4 on the click of the Command Button Calculate Income Tax as per the following condition: If the Basic is less than then IncomeTax = Basic*0.2 And if it is greater than or equal to then IncomeTax=Basic *0.3 To calculate Salary and display in jtextfield5 on the click of Command Button Calculate_Salary. Hint: Salary=(Basic + DearnessAllowance + HouseRentAllowance) - IncomeTax To Clear all Text Fields on the click of Command Button Clear. Read the following case study and answer the questions that follow. TeachWell Public School wants to computerize the employee salary section. The School is having two categories of employees: Teaching and Non Teaching. The Teaching employees are further categorized into PGTs, TGTs and PRTs having different Basic Salary. The School gives addition pay of 3000 for employees who are working for more than 10 years.

7 ii Write the code to calculate the Basic salary, deductions, gross salary and net salary based on the given specification. Add 3000 to net salary if employee is working for more than 10 years. Gross salary=basic salary + DA + HRA Net salary = Gross salary deductions f i Write the code to clear all TextFields, uncheck checkbox and set non-teaching as the default category.

8 ii iii Write the code to exit the application. Also display a message Thank you before exiting the application. Write the code to disable Text Fields for gross salary, deductions and net salary. 7 a Write a Java code that takes one integer type value from jtextfield1. If value is negative then make it positive and replace that in the jtextfield1. If value is positive then display the message using a label with suitable message: Value is Positive. b Write Java code that takes the price of a pencil from jtextfield1 and quantity of pencils from jtextfield2 and calculates total amount as price * quantity to be displayed in jtextfield3 and also find 10% tax amount to be displayed in jtextfield4. c. Write Java code that takes the price of a pencil from jtextfield1 and quantity of pencils from jtextfield2 and calculates total amount as price * quantity to be displayed in jtextfield3 and also find 10% tax amount to be displayed in jtextfield4. 8 a The following code has error(s). Rewrite the correct code underlining all the corrections made : String str1 = SeemaSurakshabal ; int b; for(int b = 0 ; b < 3, b++ ) { jtextarea1.showtext(str1+"\n" ) ; str1 = str1 + b ; } b. What is the output produced by following code fragment? float x = 9; float y = 5; int z = (int) (x/y); switch(z) { case 1: x = x + 2; case 2: x = x + 3; default: x = x + 1; } System.out.println( Value of x: + x ); b. Fill in the blanks: Class.forName("java.sql.DriverManager"); con= (Connection) DriverManager.getConnection("jdbc:mysql:// /database","user","abcd"); Statement stmt=(statement) con. ; stmt. ("SELECT * FROM ITEMS';"); c d What is JDBC? What is the importance of JDBC in establishing database connectivity? Define inheritance with reference to object oriented programming. 9 a If a database "Student" exists, which MySql command helps you to start working in that database?

9 b. Sahil created a table in Mysql. Later on he found that there should have been another column in the table. Which command should he use to add another column to the table? c. Pooja, a student of class XI, created a table "Book". Price is a column of this table. To find the details of books whose prices have not been entered she wrote the following query: 1 Select * from Book where Price = NULL; Help Pooja to run the query by removing the errors from the query and rewriting it. d. The LastName column of a table "Directory" is given below: LastName Batra Sehgal Bhatia Sharma Mehta Based on this information, find the output of the following queries: i. SELECT lastname FROM Directory WHERE lastname like "_a%"; ii SELECT lastname FROM Directory WHERE lastname not like "%a"; e. A table "Stock" in a database has 5 columns and contains 17 records. What is the degree and cardinality of this table? f. Consider the table SPORTS given below. Write commands in SQL for (i) to (iv) and output for (v) to (viii) i. Display the names of the students who have grade A in either Game1 or Game2 or both. ii. iii. iv. Display the number of students having game Cricket. Display the names of students who have same game for both Game1 and Game2. Display the games taken by the students whose name starts with A. v. SELECT COUNT(*) FROM SPORTS. vi. SELECT DISTINCT Class FROM SPORTS. vii. SELECT MAX(Class) FROM STUDENT; viii SELECT COUNT(*) FROM SPORTS GROUP BY Game1;

10 g. Write an SQL query to create the table 'Item' with the following structure: h. Consider the tables HANDSETS and CUSTOMER given below: With reference to these tables, Write commands in SQL for (i) and (ii) and output for (iii) below: i. Display the CustNo, CustAddress and corresponding SetName for each customer. ii. iii. iv. Display the Customer Details for each customer who uses a Nokia handset. Select SetNo, SetName from Handsets, customer where SetNo = SetCode and CustAddress = 'Delhi'; Answer the following questions based on above given two tables (i.e. Handsets & Customer) 1. How many rows and how many columns will be there in the Cartesian product of these two tables? 2. Which column in the 'Customer' table is the foreign key?

Q2. What will be displayed in jtextfield1 and jtextfield2 after the following code is executed:

Q1. Holiday Homework, 2018-19 Class: XI Subject : Informatics Practices Q2. What will be displayed in jtextfield1 and jtextfield2 after the following code is executed: int num = 35, num1 = 46 ; jtextfield1.settext(