Practice Questions for Java

Problem 1 : Palindromic Name

Problem Statement

Parents recently had a kid and they are a huge fan of palindromic strings. Now their relatives have

suggested creating a name for their child from both the parent's first names. Now find a way to

create a palindromic name from their parents' name. Take a substring of size at least one from both

of their names and concatenate them which should create a palindrome. If this is possible in any

way, return "YES" else return "NO".

Input Format

• The first line contains the string name.

Constraints

• 2<=len(stn)<=100

Output Format

• Return 'YES' if possible else return 'NO'.

Evaluation Parameters

• Sample Input

maria

mira

• Sample Output

Yes

• Explanation

If you remove the substring, 'ari' from 'maria' and 'ira' from 'mira' then the final string after

concatenation will be 'ariira'. This name is a palindrome so we return 'YES'.

Problem 2 : Stock Market

Complete the classes using the Specifications given below. Consider default visibility of classes,

data fields, and methods unless mentioned otherwise.

Specifications

Task
Class Stocks

-define all the data members as per the given specifications.

-define the constructor with public visibility.

-Implement the below methods for this class:

-String checkRate(float rate) throws Exception:

• Write a code that checks for the Profit and Loss in the stock rate.

• If the given parameter rate is 80% of the stockRate then return a string "Hope to raise".

• If the given parameter rate is less than 80% of the stockRate then throw StockLowException

with a message "Under Loss".

• If the given parameter rate is greater than 80% of the stockRate then throw

StockHighException with a message "Under Profit".

Class StockHighException extends Exception:

-Define StockHighException class derived from the Exception class.

Class StockLowException extends Exception:

-Define StockLowException class derived from the Exception class.

Sample Input

class definitions:

class Stocks:

float stockRate

visibility : public

Stocks(float stockRate) : Constructor with public visibility

method definition:

checkRate(float Rate) throws Exception:

return type: String

visibility: public

class StockHighException extends Exception:

method definition:

StockHighException(String msg)

visibility: public

class StockLowException extends Exception:

method definition:
 StockLowException(String msg)

visibility: public

Sample Input:

Stocks stock = new Stocks(10.0f);

stock.checkRate(5.0f);

Sample Output

StockLowException : Under Loss

Problem 3 : Library Management System

Your task here is to implement a Java code based on the following specifications.

Note that your code should match the specifications in a precise manner.

Consider default visibility of classes, data fields, and methods unless mentioned.

Specifications

class definitions:

class Book:

Data members:

name: String

IFSC: String

author: String

issuedBy: String

available: boolean

Book(String name, String IFSC, String author, boolean available): paramete

rized constructor for the data members

class Library:

Method definition:

validateIFSC(Book details) throws Exception

return type: String

visibility: public
issueBook(Book details, String name) throws Exception

return type: String

visibility: public

class InvalidIFSCException:

method definitions:

InvalidIFSCException(String str)

visibility: public

class BookUnavailableException:

method definitions:

BookUnavailableException(String str)

visibility: public

Task

Class Book

- define the String variable name.

- define the String variable IFSC.

- define the String variable author.

- define the String variable issuedBy.

- define the boolean variable available.

-Define parameterized constructor for all the data members.

Class Library

Implement the below methods for this class:

-String validateIFSC(Book details):

• Write a code to validate the IFSC code of the book.

• IFSC code is valid if it consists of 16 numeric characters. Valid IFSC = "9898121234346264".

throw an InvalidIFSCException with the message "IFSC is invalid" if the IFSC code is not

valid, else return a message "IFSC is valid".

-String issueBook(Book details, String name):

• Write a code to issue the book.

• If availability(false) of the book is not present then throw a BookUnavailableException

• If the book is available(true) then set available to false, and issuedBy to name after that

return the message "Book is issued successfully".

Class InvalidIFSCException

• define custom exception class InvalidIFSCException by extending the Exception class.

• define a parameterized constructor with a String argument to pass the message to the super

class.

Class BookUnavailableException

• define custom exception class BookUnavailableException by extending the Exception

class.

• define a parameterized constructor with a String argument to pass the message to the super

class.

Sample Input

Book data = new Book("Arthashastra", "9898121234346264", "Kautilya", true);

Library obj = new Library();

----------------------------------------------------

String ans1 = obj.validateIFSC(data);

String ans2 = obj.issueBook(data, "Steve");

Sample Output

IFSC code is valid

Book is issued successfully

Problem 4 : Update table DATABASE

Environment Specifications & Instructions

Type of Database

MySQL

Database Name to be used

school

Problem Statement

You are given a table student with following attribute:

• name varchar(5)

• class varchar(5)

Your task is to change name varchar size to 25 and make rollno as a primary key.

Problem 5 : Remove First and Last

Problem Statement

Given a string Str and a character C, your task is to remove the first and last occurrence of the

character C from the string Str.

Input Format

• First line of input consists of a string value, denoting str

• Second line of input consists of a character denoting C

Constraints

• 1 <= str.length <=100

Output Format

• Print the string after the above operation

Sample Input

Codedecode

Sample Output

coddecod

Explanation

First and last occurrence of 'e' is removed.

Problem 6 : Insert Space

Your task here is to implement a Java code based on the following specifications. Note that your

code should match the specifications in a precise manner. Consider default visibility of classes, data

fields and methods unless mentioned otherwise.

class definitions:class Source:

visibility: public

method definition:

insertSpace(String s): method that uses lambda expression to format a

given string, where a space is inserted between each character of string.

return type: String

Task

Create a Source class and implement below given method:

• insertSpace(String s): Use lambda expression to format a given string, where a space is

inserted between each character of string

Implement using Lambda expressions.

NOTE

• Do not use any for loops or other control structures.

• Use the Stream API methods for your implementations, else the test-cases might fail.

Sample Input

capgemini

Sample Output

capgemini

NOTE:

• The above Sample Input and Sample Output are only for demonstration purposes and will

be obtained if you implement the main() method with all method calls accordingly.

• Upon implementation of main() method, you can use the RUN CODE button to pass the

Sample Input as input data in the method calls and arrive at the Sample Output.