Add fresher-qa module: 50 Java interview questions for freshers, one runnable demo each, asserted transcripts, javac error captures

Co-Authored-By: Claude Sonnet 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_017ic4b5DfjBGLBr7F5km2AN
2026-11-11 19:48:45 +05:30
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+=== Q10 The four pillars of OOP ===
+Circle area = 3.14
+Rectangle area = 6.00
+rejected: amount must be positive, balance still 500.0
+=== Q11 Inheritance and constructor chaining ===
+Animal constructor
+Dog constructor
+Animal constructor
+Puppy constructor for Bruno
+=== Q12 Method overloading vs overriding ===
+FancyPrinter.show(Object)
+show(String)
+FancyPrinter.show(Object)
+=== Q13 Abstract class vs interface ===
+Scooter has 2 wheels, charging, plug Type 2
+=== Q14 Polymorphism: what is and is not dynamic ===
+Child.who() | Parent.field | Parent.static | Child.static
+=== Q15 Can you override static, private or final methods? ===
+Base.secret | Base.locked
+=== Q16 How do you create an immutable class? ===
+members: [Asha, Ravi]
+add blocked: UnsupportedOperationException
+=== Q17 Composition vs inheritance (is-a vs has-a) ===
+stack = [99, 1, 2], pop gives 2
+=== Q18 Access modifiers ===
+a -> public
+b -> protected
+c -> (package-private)
+d -> private
+=== Q19 Object class methods: toString, equals, hashCode ===
+default toString looks like ClassName@hex: true
+p1.equals(p2) = true
+set contains an equal point: false
+=== Q20 Constructors: default, chained and private ===
+default config: dev:8080
+same Registry instance: true