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PR1-W6-Part1-OOP_Classes&Objects
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24. Which access modifier allows visibility only within the same class? (2)
C
23. Which of these is not part of the typical class structure? (1)
D (A class describes fields, methods, constructors. Memory addresses are runtime details, not class structure)
21. Which of the following is a valid reason to make a field private and use getters/setters? (2)
C (Private fields prevent arbitrary external modification; setters can validate values)
Won 5 points
5
20. Predict the output: (4)
Hello from B (Dynamic dispatch — method chosen at runtime based on actual object type, not reference type)
18.What will be printed? (4)
10 (Constructor assigns value; method prints it)
17.Which line causes compile error? (3)
The System.out.println(x); line (x is an instance field; main is static → cannot access directly without an object)
16. Given String s1 = new String("hi"); String s2 = "hi";, what is s1 == s2? (3)
B (new String("hi") creates a separate object on the heap; s2 references the interned literal)
15. Given String s1 = "hi"; String s2 = "hi";, what is s1 == s2? (3)
B ( String literals are interned; identical literals refer to the same object in the string pool, so == is true)
14. Which statement about equals() is correct? (3)
B (Object.equals() tests this == obj. Many classes (e.g., String) override it to compare content)
Won 25 points
25
13. What does the expression a == b test when a and b are object references? (3)
B ( == compares references for objects. equals() can be overridden to compare content.)
12. Which is true about static fields? (2)
B (Only one copy of a static field exists per class loader; all instances share it)
11. Which keyword refers to the current instance inside an instance method or constructor? (2)
C. this
10. What is the output? (3)
2 (Static field count is shared across all objects. Each constructor increments once)
9. What is printed? (3)
70.0 (Withdraw subtracts from balance, leaving 70)
8. What happens? (3)
Compile error (No default constructor is available since the class declared a constructor with parameters)
7. What is the output? (2)
Fido (d1 and d2 refer to the same object → changing through one affects the other.)
6. What is the output? (2)
5 (int is primitive → assignment copies the value. Changing y does not affect x.)
5. Which of the following best describes encapsulation? (2)
B (Encapsulation uses private fields and public getters/setters or methods to control access)
4. Which statement about the main method is correct? (2)
B (JVM calls public static void main(String[] args) without creating an object, so main is static)
3. What does a class represent in object-oriented programming? (1)
B (A class defines fields and methods. Instances (objects) are created from that blueprint.)
2. Which of the following is not a primitive type in Java? (1)
C. String
1. Which Java keyword is used to create a new object (an instance) of a class? (1)
C. new (Example: Dog d = new Dog();)
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