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# Java-Lab-Work
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# **Java Lab Work - UPES**
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This respository contains all the assignments that I have performed in my Java lab.
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## **Experiment 1 : Basics of Java**
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1. Write program to print the kth digit from last. e.g. input 23617 and k=4 output 3.
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2. Write a program to print first digit. e.g. input 23516 output 2.
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3. Write program to print the second digit. e.g. input 23516 the output is 3.
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4. Write program to find sum of all digits. Input 23617 output 2+3+6+1+7=19.
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5. Write program, which will find sum of product to consecutive digits. e.g. when the input is 23145 the output is 2x3 + 3x1 + 1x4 + 4x5 = 33.
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6. Write program, which reads two number (assume that both have same number of digits). The program outputs the sum of product of corresponding digits. Input 327 and 539 output 3x5+2x3+7x9=84.
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7. Write program to print positional values of digits. Input 21463 output 3, 60, 400, 1000 and 20000.
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8. Modify first example for taking input through command line arguments.
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9. Modify second example for taking input through command line arguments.
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10. Define fa. If point p is (x,y) then p.fa() will make it (x+y,2y). (20,4) (24,8)
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11. Define fb. If point p is (x,y) then p.fb() will make it (2x,x+y). (20,4) (40,24)Define fc. If point p is (x,y) then p.fc() will make it (x+y,x*y). (20,4) (24,80)
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## **Experiment 2 : Basics of Java Programming**
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1. Write a program to find the largest of 3 numbers.
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2. Write a program to implement a command line calculator. (Try for Add sub Mul Division in same program for 2 digits.)
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Integer.parseInt will be used<br>
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For e.g. java calc 20 + 30<br>
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Output should be Sum of 20 and 30 is 50
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java calc 50 * 30<br>
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Output should be Product of 50 and 30 is 1500
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3. Write a program to accept 10 student's mark in an array, arrange it into ascending order, convert it into the following grades and print marks and grades in the tabular form.<br>
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Between 40 and 50 : PASS<br>
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Between 51 and 75 : MERIT<br>
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and above : DISTINCTION<br>
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for example:<br>
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Enter Marks: 50<br>
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30<br>
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50<br>
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50<br>
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30<br>
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50<br>
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Output should be sorted array with Grade like:<br>
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55 Merit<br>
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41 Pass<br>
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29 Fail<br>
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4. WAP to Take input as DD MM YYYY(04 08 2021) in command line and calculate number of days since 1 January 1970.
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## **Experiment 3 :**
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1. Write a program to accept three digits (i.e., 0 - 9) and print all its possible combinations.<br>
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(For example if the three digits are 1, 2, 3 than all possible combinations are : 123, 132,
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213, 231, 312, 321.)
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2. Write a Java Program to accept 10 numbers in an array and compute the square of each number. Print the sum of these numbers.
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3. Write a program to input a number of a month (1 - 12) and print its equivalent name of
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the month. ( e.g 1 to Jan, 2 to Feb. 12 to Dec.)
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4. Write a program to find the sum of all integers greater than 40 and less than 250 that are divisible by 5.
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## **Experiment 4 : Inheritance**
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1. Write a Java program to show that private member of a super class cannot be accessed from derived classes.
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2. Write a program in Java to create a Player class. Inherit the classes Cricket _Player, Football _Player and Hockey_ Player from Player
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class.
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3. Write a class Worker and derive classes DailyWorker and SalariedWorker from it. Every worker has a name and a salary rate. Write
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method ComPay (int hours) to compute the week pay of every worker. A Daily Worker is paid on the basis of the number of days
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he/she works. The Salaried Worker gets paid the wage for 40 hours a week no matter what the actual hours are. Test this program to
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calculate the pay of workers. You are expected to use the concept of polymorphism to write this program.
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4. Consider the trunk calls of a telephone exchange. A trunk call can be ordinary, urgent or lightning. The charges depend on the duration
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and the type of the call. Write a program using the concept of polymorphism in Java to calculate the charges.
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5. Design a class employee of an organization. An employee has a name, empid, and salary. Write the default constructor, a constructor
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with parameters (name, empid, and salary) and methods to return name and salary. Also write a method increaseSalary that raises the
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employee’s salary by a certain user specified percentage. Derive a subclass Manager from employee. Add an instance variable named
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department to the manager class. Supply a test program that uses theses classes and methods
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## **Experiment 5 : Interface**
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1. Write a program to create interface named test. In this interface the member function is square. Implement this interface in arithmetic
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class. Create one new class called ToTestInt. In this class use the object of arithmetic class.
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2. Write a program to create interface A, in this interface we have two method meth1 and meth2. Implements this interface in another
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class named MyClass.
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3. Write a program in Java to show the usefulness of Interfaces as a place to keep constant value of the program
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4. Write a program to create an Interface having two methods division and modules. Create a class, which overrides these methods.
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5. Write program to create an interface StackInterface having methods push (), pop () and display (). StackClass implements
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StackInterface. Class StackClass contains the main method which is having a switch case for selecting the particular operation of the
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stack
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## **Experiment 6 : Packages**
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1. Write a Java program to implement the concept of importing classes from user defined package and created packages.
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2. Write a program to make a package Balance. This has an Account class with Display_Balance method. Import Balance package in
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another program to access Display_Balance method of Account class.
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3. WAP to create a package p with class A with 4 types of access protected methods. How we will use these methods in different packages
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class i.e. there is main() in class B in package Q and 4 methods are in Class A in package p.
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## **Experiment 7 : Exceptions**
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1. Write a program in Java to display the names and roll numbers of students. Initialize respective array variables for 10 students. Handle
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ArrayIndexOutOfBoundsExeption, so that any such problem doesn’t cause illegal termination of program.
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2. Create an exception class, which throws an exception if operand is nonnumeric in calculating modules. (Use command line arguments).
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3. Write a code to create your own exception class. Create another class, inside main method prompt user to enter a number if number is
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less than 500 throw instances of your custom exception class.
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4. You are given two integers, a and b as input, you have to compute a/b: If a and b are not bit signed integers or if is zero, exception
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will occur and you have to report it. Read sample Input/Output to know what to report in case of exception. <br>
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Sample Input 0:<br>
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10<br>
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3<br>
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Sample Output 0: <br>
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3<br>
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Sample Input 1:<br>
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10<br>
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Hello<br>
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Sample Output 1 :<br>
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java.util.InputMismatchException<br>
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Sample Input 2:<br>
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10<br>
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0<br>
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Sample Output 2:<br>
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java.lang.ArithmeticException: / by zero<br>
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Sample Input 3:<br>
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23.323<br>
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0<br>
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Sample Output 3:<br>
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java.util.InputMismatchException<br>
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5. You are required to compute the power of a number by implementing a calculator. Create a class Calc which consists of a single
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method long power(int, int). This method takes two integers, a and b, as parameters and finds a
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b
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. If either a or b is negative, then
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the method must throw an exception which says "a and b should not be negative". Also, if both a and b are zero, then the method
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must throw an exception which says "a and b should not be zero"<br>
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For example, -4 and -5 would result in java.lang.Exception: a and b should not be negative.<br>
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Complete the function power in class Calc and return the appropriate result after the power operation or an appropriate exception as
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detailed above.<br>
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<b>Input Format</b><br>
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Each line of the input contains two integers, a and b. The code must read the input and send the values to the method as
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parameters.<br>
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Constraints<br>
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* -10 <= a<= 10<br>
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* -10 <= b<= 10<br>
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<b>Output Format</b><br>
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Each line of the output contains the result, if both a and b are positive. If either a or b is negative, the output contains "a and b
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should be non-negative". If both a and b are zero, the output contains "a and b should not be zero."<br>
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<b>Sample Input 0 :</b><br>
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3 5<br>
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2 4<br>
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0 0<br>
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-1 -2<br>
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-1 3<br>
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<b>Sample Output 0 :</b><br>
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243<br>
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16<br>
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java.lang.Exception: n and p should not be zero.<br>
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java.lang.Exception: n or p should not be negative.<br>
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java.lang.Exception: n or p should not be negative<br>
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## **Experiment 8 : String Handling and Exceptions**
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1. Write a program for searching strings for the first occurrence of a character or substring and for the last occurrence of a character or
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substring.
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2. Write a program that converts all characters of a string in capital letters. (Use StringBuffer to store a string). Don’t use inbuilt function.
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3. Write a program in Java to read a statement from console, convert it into upper case and again print on console. (Don’t use inbuilt
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function)
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4. Write a program in Java to create a String object. Initialize this object with your name. Find the length of your name using the
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appropriate String method. Find whether the character ‘a’ is in your name or not; if yes find the number of times ‘a’ appears in your
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name. Print locations of occurrences of ‘a’ .Try the same for different String objects
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5. Write a Java code that converts int to Integer, converts Integer to String, converts String to int, converts int to String, converts String
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to Integer converts Integer to int.
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6. Write a Java code that converts float to Float converts Float to String converts String to float converts float to String converts String
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to Float converts Float to float.
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## **Experiment 9 : Threads**
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1. Write a program to implement the concept of threading by extending Thread Class and Runnable interface.
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2. Write a program for generating 2 threads, one for printing even numbers and the other for printing odd numbers.
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3. Write a program to launch 10 threads. Each thread increments a counter variable. Run the program with synchronization.
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4. Write a Java program to create five threads with different priorities. Send two threads of the highest priority to sleep state. Check the
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aliveness of the threads and mark which thread is long lasting
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## **Experiment 10 : Collections**
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1. Write a program for the following<br>
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* Read all elements from ArrayList by using Iterator.
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* Create duplicate object of an ArrayList instance.
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* Reverse ArrayList content.
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2. Write a program for the following HashMap
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* find whether specified key exists or not.
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* find whether specified value exists or not
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* get all keys from the given HashMap
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* get all key-value pair as Entry objects
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3. Write a program for the following HashSet
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* copy another collection object to HashSet object.
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* delete all entries at one call from HashSet
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* search user defined objects from HashSet<br>
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## **Experiment 11 : JDBC**
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1. Create a database table to store the records of employee in a company. Use getConnection function to connect the database. The
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statement object uses executeUpdate function to create a table.
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2. Create a database of employee of company in mysql and then use java program to access the database for inserting information of
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employees in database. The SQL statement can be used to view the details of the data of employees in the database.
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3. Create a table Meeting having columns (NameOfParticipant, MeetingID, ScheduledTime, Email, Mobile), Populate with random data
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and perform following operations. READ COMPLETE QUESTION TO POPULATE DATABASE.<br>
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a) Using JaveCode determine the names of the columns in the MEETING table and display the column names on the console.<br>
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b) Write a query to find the names of all participants for the meeting with ID 1144. Display the names on the console, preceded by
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the message, “Names of participants in meeting 1144”.<br>
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c) Insert a new participant with using only the participant’s name. Don’t specify the participant ID - let the ID be determined by the
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database. Determine the ID that was assigned to the new participant and display it on the console (the statement that displays the
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ID should display the name of the new participant as well).<br>
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d) Count the number of people participating in the meeting with ID 1105. Display a message on the console that gives both the
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meeting name and the number of participants.<br>
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e) Determine the names of all people who participate in meetings that meet on Tuesdays. Display the names, preceded by the
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message, “Participants attending Tuesday meetings”.<br>
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## **Experiment 12 : Servlet**
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1. Servlet : <br>a) ServletContext interface<br> b) getParameterValues() of Servlet Request<br>
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2) Write a Servlet page to display current date of the server.<br>
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3) Write a Servlet page to which include the two other Servlet page through of include directives feature provided in Servlet.
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4) Write a Servlet page to create a simple calculator.
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