Same chapter3 marksDifficulty: Medium
Why are the data members of a class usually declared private?
Encapsulation and Class as a User-Defined Type
3 marksDifficulty: Medium
What is the this keyword and when is it needed?
Original Khojo Papers practice question — not from a past board paper.
Answer
this is a reference to the current object. It is needed when a parameter or local variable has the same name as an instance variable and would otherwise hide it, and it can also be used to pass the current object to another method or to invoke another constructor of the same class.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Writing "this.length = length;" in a constructor is the commonest use.
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Same chapter3 marksDifficulty: Medium
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What is the output of: String s = "Examination"; System.out.println(s.length() + " " + s.substring(0, 4) + " " + s.toUpperCase().charAt(2));
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