Software Engineering
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๐ ๐ฒ๐๐ต๐ผ๐ฑ ๐ผ๐๐ฒ๐ฟ๐น๐ผ๐ฎ๐ฑ๐ถ๐ป๐ด ๐๐ ๐บ๐ฒ๐๐ต๐ผ๐ฑ ๐ผ๐๐ฒ๐ฟ๐ฟ๐ถ๐ฑ๐ถ๐ป๐ด - ๐๐ผ ๐๐ผ๐ ๐ธ๐ป๐ผ๐ ๐๐ต๐ฒ ๐ฟ๐ฒ๐ฎ๐น ๐ฑ๐ถ๐ณ๐ณ๐ฒ๐ฟ๐ฒ๐ป๐ฐ๐ฒ?
Both are forms of polymorphism in Java -
but they solve very different problems.
๐ ๐ฒ๐๐ต๐ผ๐ฑ ๐ผ๐๐ฒ๐ฟ๐น๐ผ๐ฎ๐ฑ๐ถ๐ป๐ด
โข Same method name, different parameters
โข Happens in the same class
โข Resolved at compile time
๐ ๐ฒ๐๐ต๐ผ๐ฑ ๐ผ๐๐ฒ๐ฟ๐ฟ๐ถ๐ฑ๐ถ๐ป๐ด
โข Same method signature in parent and child class
โข Enables runtime behavior changes
โข Resolved at runtime
๐๐ป ๐๐ถ๐บ๐ฝ๐น๐ฒ ๐๐ฒ๐ฟ๐บ๐:
โข Overloading โ multiple ways to call a method
โข Overriding โ changing behavior in subclasses
Understanding this difference is essential
๐ฟ๐ค ๐๐ค๐ช ๐๐๐๐ก๐ก๐ฎ ๐๐ฃ๐ค๐ฌ ๐
๐๐ซ๐? โ ๐๐๐ง๐ฉ 35
#Java #SoftwareEngineering
๐๐ป๐ต๐ฒ๐ฟ๐ถ๐๐ฎ๐ป๐ฐ๐ฒ - ๐ฃ๐ผ๐๐ฒ๐ฟ ๐ฎ๐ป๐ฑ ๐๐ฎ๐ป๐ด๐ฒ๐ฟ
Inheritance lets a class derive ๐ฎ๐๐๐ฟ๐ถ๐ฏ๐๐๐ฒ๐ ๐ฎ๐ป๐ฑ ๐ฏ๐ฒ๐ต๐ฎ๐๐ถ๐ผ๐ฟ๐ from another class.
It enables you to create new classes from existing ones, thereby improving code reuse and structure.
โข A child class can directly use the parent classโs variables and methods without duplicating code.
โข A child class can also introduce new features or override existing ones to enhance functionality.
It provides:
โข Code reuse
โข Polymorphism
โข Clear โis-aโ relationships
Inheritance enables reuse and polymorphism,
Inheritance also introduces ๐๐ถ๐ด๐ต๐ ๐ฐ๐ผ๐๐ฝ๐น๐ถ๐ป๐ด.
Use inheritance intentionally.
Prefer composition when possible.
๐ฟ๐ค ๐๐ค๐ช ๐๐๐๐ก๐ก๐ฎ ๐๐ฃ๐ค๐ฌ ๐
๐๐ซ๐? โ ๐๐๐ง๐ฉ 34
#Java #SoftwareEngineering
๐๐ผ๐ป๐๐๐ฟ๐๐ฐ๐๐ผ๐ฟ ๐ผ๐๐ฒ๐ฟ๐น๐ผ๐ฎ๐ฑ๐ถ๐ป๐ด -
๐บ๐๐น๐๐ถ๐ฝ๐น๐ฒ ๐๐ฎ๐๐ ๐๐ผ ๐ฐ๐ฟ๐ฒ๐ฎ๐๐ฒ ๐ฎ๐ป ๐ผ๐ฏ๐ท๐ฒ๐ฐ๐.
Defining more than one constructor inside a class is ๐๐ผ๐ป๐๐๐ฟ๐๐ฐ๐๐ผ๐ฟ ๐ข๐๐ฒ๐ฟ๐น๐ผ๐ฎ๐ฑ๐ถ๐ป๐ด.
The ๐๐ถ๐ด๐ป๐ฎ๐๐๐ฟ๐ฒ of the constructor must be different.
We can change the signature of the constructor in the following ways:
ย ย โข By changing the ๐ป๐๐บ๐ฏ๐ฒ๐ฟ ๐ผ๐ณ ๐ฝ๐ฎ๐ฟ๐ฎ๐บ๐ฒ๐๐ฒ๐ฟ๐.
ย ย โข By changing the ๐ฑ๐ฎ๐๐ฎ๐๐๐ฝ๐ฒ๐ ๐ผ๐ณ ๐ฎ๐ฟ๐ด๐๐บ๐ฒ๐ป๐๐.
ย ย โข By changing the ๐๐ฒ๐พ๐๐ฒ๐ป๐ฐ๐ฒ ๐ผ๐ณ ๐ฎ๐ฟ๐ด๐๐บ๐ฒ๐ป๐๐.
Constructor Overloading adds flexibility,
But too many constructors hurt readability.
๐ฟ๐ค ๐๐ค๐ช ๐๐๐๐ก๐ก๐ฎ ๐๐ฃ๐ค๐ฌ ๐
๐๐ซ๐? โ ๐๐๐ง๐ฉ 33
#Java #SoftwareEngineering
๐ง๐๐ฝ๐ฒ๐ ๐ผ๐ณ ๐๐ผ๐ป๐๐๐ฟ๐๐ฐ๐๐ผ๐ฟ๐ ๐ถ๐ป ๐๐ฎ๐๐ฎ - ๐๐ต๐ฎ๐ ๐ฎ๐ฟ๐ฒ ๐๐ต๐ฒ๐ ๐ฟ๐ฒ๐ฎ๐น๐น๐?
In Java, constructors arenโt just about creating objects.
They control how objects are born.
There are several types of constructors:
๐๐ผ๐ฝ๐ ๐๐ผ๐ป๐๐๐ฟ๐๐ฐ๐๐ผ๐ฟ
โข Creates a new object using another object
โข Java doesnโt provide it by default - you define it
โข Useful for cloning state
Why this matters:
Good constructors = clean objects.
Bad constructors = bugs waiting to happen.
They donโt just create objects,
They define object quality.
๐ฟ๐ค ๐๐ค๐ช ๐๐๐๐ก๐ก๐ฎ ๐๐ฃ๐ค๐ฌ ๐
๐๐ซ๐? โ ๐๐๐ง๐ฉ 32.1
#Java #OOP #SoftwareEngineering
๐๐ผ๐ป๐๐๐ฟ๐๐ฐ๐๐ผ๐ฟ๐ - ๐๐ต๐ ๐๐ต๐ฒ๐ ๐ฟ๐ฒ๐ฎ๐น๐น๐ ๐บ๐ฎ๐๐๐ฒ๐ฟ ๐ถ๐ป ๐๐ฎ๐๐ฎ.
A constructor looks like a method, but itโs not.
When you write:
new MyClass()
The constructor runs to bring an object to life.
Without constructors, objects could start broken or incomplete.
What constructors do:
โข Allocate memory
โข Initialize instance variables
โข Ensure valid object state
โข No return type allowed
โข Same name as class + ()
โข Creating the object = running the constructor
They control how objects are born.
Constructors enforce:
โข Proper initialization
โข Required dependencies
โข Controlled object creation
Theyโre not just syntax -
They define how objects come into existence.
๐ฟ๐ค ๐๐ค๐ช ๐๐๐๐ก๐ก๐ฎ ๐๐ฃ๐ค๐ฌ ๐
๐๐ซ๐? โ ๐๐๐ง๐ฉ 32
#Java #SoftwareEngineering
๐๐น๐ฎ๐๐ ๐๐ ๐ข๐ฏ๐ท๐ฒ๐ฐ๐ -
๐ช๐ต๐ฎ๐ ๐ฑ๐ผ ๐๐ต๐ฒ๐ ๐ฟ๐ฒ๐ฎ๐น๐น๐ ๐บ๐ฒ๐ฎ๐ป?
๐ข๐ฏ๐ท๐ฒ๐ฐ๐๐:
โข A ๐ฟ๐ฒ๐ฎ๐น-๐๐ผ๐ฟ๐น๐ฑ ๐ฒ๐ป๐๐ถ๐๐, live in memory.
โข Every object is an ๐ถ๐ป๐๐๐ฎ๐ป๐ฐ๐ฒ ๐ผ๐ณ ๐ฎ ๐ฐ๐น๐ฎ๐๐.
โข Objects can not be created directly.
โข Objects have their own state and identity.
You write classes.
You work with objects.
Understanding this distinction is fundamental to object-oriented thinking.
๐ฟ๐ค ๐๐ค๐ช ๐๐๐๐ก๐ก๐ฎ ๐๐ฃ๐ค๐ฌ ๐
๐๐ซ๐? โ ๐๐๐ง๐ฉ 31
#Java #SoftwareEngineering