CS311 Short Summary by Beyza Aysun

MODULE 1 — Object Oriented Paradigm · Concept · Meaning

Object Real world entity Class Blueprint of objects State Properties Behavior Actions

Inheritance Properties inherit karna Generalization Common cheezein combine karna

Concept

Meaning

Specialization General class se specific class banana Extension Existing class mein new features add karna Restriction Child class mein limitations lagana

Data Hiding Internal details hide karna Public Sab access kar sakte Private Sirf class ke andar Protected Child classes access kar sakti hain

Concept

Meaning

Information Hiding Important data hide karna Single Inheritance One parent →one child Multilevel Inheritance Grandparent →Parent →Child Multiple Inheritance Multiple parents →one child Association Objects ka relationship One Way Association Relation sirf ek direction mein Two Way Association Dono directions mein relation Ternary Association 3 entities ka relation Strong relationship Weak relationship Child independent nahi hota Child independent hota Parent delete →child bhi delete Parent delete →child zinda Example: House-Room Example: Department-Teacher

Abstract Class

Interface

Some implementation ho sakti Sirf method declarations Inheritance use hota Implements use hota “is-a” relationship Contract/service

Overloading

Overriding

Same class me hoti Parent-child me hoti Parameters different Parameters same Compile time Run time Example: add(int), add(double) Boy.eat()

Composition →Child parent ke bina nahi reh sakta Aggregation →Child independent hota Abstract Class →Blueprint jiska object nahi banta Concrete Class →Complete class jiska object banta Interface →Contract Overloading →Same method, different parameters Overriding →Child parent method ko replace karta hai

Concept

Meaning

Overloading Same method, different parameters Overriding Child replaces parent method Polymorphism One interface, many forms Dynamic Binding Runtime pe method decide Child object ko parent type banana

Child →Parent Parent →Child

MODULE 2 — Basics of Java Programming · Variable Types Comparison · Feature · Local · Instance · Static

Kahan banti Method Object Class Memory Stack Heap Static memory Default value Nahi Haan Haan Access modifier Nahi Haan Haan Lifetime Method tak Object tak Program tak

Easy Real-Life Analogy

Local Variable

Exam hall me rough work. Temporary.

Instance Variable

Har student ka:

roll number Different.

Static Variable

School ka naam. Sab students ke liye same.

Short Summary

JVM

Java program ko run karti hai Bytecode execute karti hai Memory manage karti hai Garbage collection karti hai

Data Types

Primitive

Basic values: int char float