BCA 104T Object Oriented Programming using Java Notes for GGSIPU BCA Sem 2

BCA 104T Object Oriented Programming using Java at a glance: GGSIPU BCA Sem 2 credits, units and exam pattern

BCA 104T sits with nine other papers in the GGSIPU BCA Semester 2 papers.

BCA 104T Object Oriented Programming using Java Notes unit-wise: 75 solved programs across 4 units

Notes for every other paper of the course sit on GGSIPU BCA notes.

BCA 104T Unit 1: Object Oriented Paradigm and Java Basics

Unit 1 sets procedural and object-oriented design side by side, then covers Java history, buzzwords, JDK/JRE/JVM, tokens, data types, casting, operators, loops and arrays.

Pages 4 to 35 · 17 sections · 19 programs (1.1 to 1.19) · 24 two-mark and 10 ten-mark solved questions.

BCA 104T Unit 2: Classes, Inheritance, Interfaces, Packages and Polymorphism

Unit 2 covers constructors, access modifiers, this, static and final, the String class, inheritance with super, overriding, abstract classes, interfaces, user-defined packages, dynamic binding, instanceof and generics.

Pages 36 to 68 · 20 sections · 20 programs (2.1 to 2.20) · 25 two-mark and 11 ten-mark solved questions.

BCA 104T Unit 3: Using I/O, Byte Streams, Character Streams and File Handling

Unit 3 maps the java.io hierarchy, then works through console and file I/O with byte streams, BufferedReader, FileWriter, FileReader, PrintWriter and the File class.

Pages 69 to 91 · 10 sections · 17 programs (3.1 to 3.17) · 20 two-mark and 8 ten-mark solved questions.

BCA 104T Unit 4: Exception Handling and Multithreaded Programming

Unit 4 first covers the exception hierarchy, try, catch, finally, throw, throws and custom exceptions like InsufficientBalanceException, then threads: life cycle, Thread vs Runnable and synchronization.

Pages 92 to 118 · 16 sections · 19 programs (4.1 to 4.19) · 25 two-mark and 8 ten-mark solved questions.

Quick look: validating input with throw (from page 100)

static void checkAge(int age) {  
    if (age < 0)  
        throw new IllegalArgumentException("Negative age: " + age);  
    if (age < 18)  
        throw new ArithmeticException("Not eligible to vote, age " + age);  
}

static void checkAge(int age) {  
    if (age < 0)  
        throw new IllegalArgumentException("Negative age: " + age);  
    if (age < 18)  
        throw new ArithmeticException("Not eligible to vote, age " + age);  
}

Output for checkAge(15): ArithmeticException: Not eligible to vote, age 15.

BCA 104T exam corner: 94 two-mark and 37 ten-mark solved questions by unit

The BCA 104T notes solve 94 two-mark and 37 ten-mark questions across 4 units, plus 75 programs with output.

Four GGSIPU-pattern questions, one per unit:

1. Unit 1 (2 marks): Why is Java called platform independent? javac makes bytecode, not machine code, so any system with a JVM runs the same .class file.
2. Unit 2 (10 marks): What is an abstract class? Write a program to find the area of different shapes using one. Rules, then Program 2.13 (Shape with three sub classes) and its output.
3. Unit 3 (10 marks): Write a program to count the characters, words and lines in a text file. Program 3.12, its word-counting logic and output.
4. Unit 4 (2 marks): Differentiate start() and run(). start() creates a new thread; calling run() directly runs it on the current thread.

More practice for this paper sits in the BCA 104T important questions.

Who writes and checks the BCA 104T Java notes?

• Prateek Talwar, author · Founder, Unnati Educations · Associate Company Secretary (ACS), ICSI, membership no. 58704, since 15 May 2019 · B.Com, University of Delhi (School of Open Learning), 2012 · Author bio
• Ritik Rawat, subject reviewer · Senior Full Stack Developer, Unnati Educations · B.Tech · Reviewer bio

The BCA 104T Java IPU notes are mapped unit by unit to the 2024-25 scheme. Ritik Rawat reviews the theory and all 75 programs with output, from Hello.java to ProducerConsumer.java.

The 2026-27 edition has 118 pages, 35 figures and 49 tables, last updated 12 October 2026 under our editorial policy.

The same team prepares GGSIPU important questions for each course it covers.

How to write BCA 104T answers: class-plus-output programs and ten-mark difference tables

Two-mark answers (Q1). The notes advise 3 to 5 lines: keyword, one-line definition, tiny example. Q1 takes at least 2 parts from each unit, so no unit can be skipped.

Worked example. "What is type casting? Give an example." Answer: Converting a value of one data type into another is type casting. Widening, such as int to double, is automatic; narrowing needs an explicit cast, so int x = (int) 9.75; stores 9.

Ten-mark program answers. Write the full class, the main() method and the expected output. The Unit 2 exam corner notes that examiners give marks for output.

Ten-mark difference answers. Overloading vs overriding or abstract class vs interface need an 8-point table plus one small example. The Unit 1 tip: for POP vs OOP, add that C struct data is open to every function while Java private fields are not.

Diagrams. Draw the JVM architecture (Unit 1), the stream hierarchy (Unit 3), and the exception hierarchy and thread life cycle (Unit 4).

Common mistakes the notes flag. A missing break in switch falls through; a FileWriter without true wipes the old file; calling start() twice throws IllegalThreadStateException. For thread programs, note that output order may vary.

Practise this answer format on GGSIPU BCA important questions.

BCA 104T and the BCA 104P Java lab, plus other GGSIPU BCA Sem 2 papers

The practical paper has its own page: BCA 104P Java lab notes.

BCA 104P is a CCP paper (2 credits, 100 marks) with the same course outcomes; the teacher notifies its practical list in week one.

These GGSIPU BCA Semester 2 Java notes help at the lab bench by unit: Unit 1 loops and arrays (Programs 1.8 to 1.19), Unit 2 constructors, inheritance and interfaces (Programs 2.2 to 2.15), Unit 3 file reading and writing (Programs 3.3 to 3.17) and Unit 4 thread creation and synchronization (Programs 4.11 to 4.19).

Other Semester 2 papers: BCA 102T Database Management System (DBMS), BCA 106T Data Structures and Algorithms, BCA 108T Software Engineering, BCA 142T Soft Skills, BCA 192T Environment Studies, and the labs BCA 102P, BCA 106P and BCA 108P.

try-with-resources in Java file handling: excerpt from page 77 of the BCA 104T notes

Excerpt from page 77 (Unit 3, section 3.5, Automatically Closing a File)

FileInputStream fin = null;  
try {  
    fin = new FileInputStream("a.txt");  
    // use fin  
} catch (IOException e) {  
    // handle  
} finally {  
    try { if (fin != null) fin.close(); }  
    catch (IOException e) { }  
}

FileInputStream fin = null;  
try {  
    fin = new FileInputStream("a.txt");  
    // use fin  
} catch (IOException e) {  
    // handle  
} finally {  
    try { if (fin != null) fin.close(); }  
    catch (IOException e) { }  
}

try (FileInputStream fin = new FileInputStream("a.txt");  
     FileOutputStream fout = new FileOutputStream("b.txt")) {  
    // use fin and fout  
} catch (IOException e) {  
    // handle  
}   // fout is closed first, then fin

try (FileInputStream fin = new FileInputStream("a.txt");  
     FileOutputStream fout = new FileOutputStream("b.txt")) {  
    // use fin and fout  
} catch (IOException e) {  
    // handle  
}   // fout is closed first, then fin

Do the BCA 104T notes cover the full GGSIPU syllabus?

Yes for all four units: every official unit topic has its own section. One gap: Java Swing, named in the learning objectives but in no unit, is not covered.

Official sources: GGSIPU BCA First Year Syllabus (batch 2024-25 onwards) and GGSIPU BCA Scheme and Syllabus w.e.f. 2024-25.

Every course in GGSIPU notes is mapped to its official PDF the same way, unit by unit.

BCA 104T Java notes FAQs

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Format: printed book only, with a contents page for all 63 sections.

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Unnati Educations is an independent education provider based in Vikaspuri, Delhi. We are not affiliated with, authorised by, or endorsed by Guru Gobind Singh Indraprastha University (GGSIPU). 'GGSIPU' and 'IPU' are used only to describe the syllabus our notes follow. For official information, visit ipu.ac.in.