Java-Programming-Exercises-2

This repository contains solutions to Day 2 Java programming exercises. These programs are designed to strengthen the understanding of Java fundamentals, including arrays, strings, constructors, inheritance, and object-oriented programming.

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📚 Topics Covered

• Arrays
• Multidimensional Arrays
• Jagged Arrays
• String Handling
• StringBuffer
• Constructors
• this Keyword
• super Keyword
• Inheritance
• Object-Oriented Programming (OOP)

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📂 Exercises

Exercise 1 – Employee Salary Analyzer

• Store employee salaries in an array
• Find highest salary
• Find lowest salary
• Calculate average salary
• Count employees earning above average

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Exercise 2 – Second Largest Element

• Find the second largest element in an integer array
• Handles duplicate values correctly

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Exercise 3 – Move All Zeros to End

• Move all zero values to the end
• Preserve the order of non-zero elements

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Exercise 4 – Student Marks Matrix

• Create a 3 × 4 marks matrix
• Calculate total marks
• Calculate average marks
• Identify the topper

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Exercise 5 – Department-wise Employee Count (Jagged Array)

• Create a jagged array
• Display employee count for each department
• Calculate total employees

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Exercise 6 – Company Email Validator

• Validate company email addresses
• Check if the email ends with @company.com

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Exercise 7 – Resume Word Counter

• Count the number of words in a resume summary

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Exercise 8 – Mobile Number Masking

• Mask the first six digits using StringBuffer

Example:

9876543210
******
3210

Output:

******3210

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Exercise 9 – Employee Class Using this Keyword

• Parameterized constructor
• Initialize instance variables using this
• Display employee details

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Exercise 10 – Inheritance Using super Keyword

• Parent class: Person
• Child class: Employee
• Initialize parent variables using super
• Display complete employee information

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📁 Project Structure

src/
│
├── exercise1/
├── exercise2/
├── exercise3/
├── exercise4/
├── exercise5/
├── exercise6/
├── exercise7/
├── exercise8/
├── exercise9/
└── exercise10/

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🛠 Technologies Used

• Java
• Eclipse IDE
• JDK 17 (or above)

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🎯 Learning Outcomes

By completing these exercises, you will gain hands-on experience with:

• Array manipulation
• Matrix operations
• Jagged arrays
• String processing
• StringBuffer methods
• Constructors
• this keyword
• super keyword
• Inheritance
• Object-Oriented Programming

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