Computer Science Java 2025/2026 Exam
Questions and Verified Answers |
Already Graded A+
keywords - 🧠ANSWER ✔✔class, while and if are....
primitive types - 🧠ANSWER ✔✔which are simple values stored directly in
the memory location
reference types - 🧠ANSWER ✔✔which store addresses of objects stored
somewhere else in memory
static - 🧠ANSWER ✔✔methods not associated with any object
instance - 🧠ANSWER ✔✔methods are part of objects and can only be
called through an object
What are the two general ways of accessing a Java array? - 🧠ANSWER
✔✔direct access and sequential access
,direct access - 🧠ANSWER ✔✔accessing an arbitrary location
sequential access - 🧠ANSWER ✔✔going through the entire array
compiler/syntax errors - 🧠ANSWER ✔✔prevent program from being
compiled properly,
forgetting semicolon or braces
logic errors - 🧠ANSWER ✔✔are problems with what the code actually does,
like forgetting braces around else, so the code doesn't know what to do
with else
Data hiding - 🧠ANSWER ✔✔when an object hides its internal data from
code outside the class that the object
//is an instance of. Only the class can access its own methods. Make fields
private and methods public
data abstraction - 🧠ANSWER ✔✔using a class without knowing its
implementation Details
differences between array and arraylist - 🧠ANSWER ✔✔- Array is a fixed
length data structure
, - arraylist- You can not change length of Array once created in Java but
ArrayList re-size itself when gets full depending upon capacity and load
factor.
-one more major difference between ArrayList and Array is that, you can
not store primitives in ArrayList, it can only contain Objects. While Array
can contain both primitives and Objects in Java
infinite loops - 🧠ANSWER ✔✔-loop that never terminates, the test condition
is always true if nothing is done to change the condition within the loop
body
Inheritance - 🧠ANSWER ✔✔- Properties of a data type can be passed
down to a sub-type
Polymorphism - 🧠ANSWER ✔✔- Operations used with a variable are based
on the class of the object being accessed, not the class of the variable
we can use an arrayList without having to know whether its implemented
true or false? - 🧠ANSWER ✔✔true
3
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
Questions and Verified Answers |
Already Graded A+
keywords - 🧠ANSWER ✔✔class, while and if are....
primitive types - 🧠ANSWER ✔✔which are simple values stored directly in
the memory location
reference types - 🧠ANSWER ✔✔which store addresses of objects stored
somewhere else in memory
static - 🧠ANSWER ✔✔methods not associated with any object
instance - 🧠ANSWER ✔✔methods are part of objects and can only be
called through an object
What are the two general ways of accessing a Java array? - 🧠ANSWER
✔✔direct access and sequential access
,direct access - 🧠ANSWER ✔✔accessing an arbitrary location
sequential access - 🧠ANSWER ✔✔going through the entire array
compiler/syntax errors - 🧠ANSWER ✔✔prevent program from being
compiled properly,
forgetting semicolon or braces
logic errors - 🧠ANSWER ✔✔are problems with what the code actually does,
like forgetting braces around else, so the code doesn't know what to do
with else
Data hiding - 🧠ANSWER ✔✔when an object hides its internal data from
code outside the class that the object
//is an instance of. Only the class can access its own methods. Make fields
private and methods public
data abstraction - 🧠ANSWER ✔✔using a class without knowing its
implementation Details
differences between array and arraylist - 🧠ANSWER ✔✔- Array is a fixed
length data structure
, - arraylist- You can not change length of Array once created in Java but
ArrayList re-size itself when gets full depending upon capacity and load
factor.
-one more major difference between ArrayList and Array is that, you can
not store primitives in ArrayList, it can only contain Objects. While Array
can contain both primitives and Objects in Java
infinite loops - 🧠ANSWER ✔✔-loop that never terminates, the test condition
is always true if nothing is done to change the condition within the loop
body
Inheritance - 🧠ANSWER ✔✔- Properties of a data type can be passed
down to a sub-type
Polymorphism - 🧠ANSWER ✔✔- Operations used with a variable are based
on the class of the object being accessed, not the class of the variable
we can use an arrayList without having to know whether its implemented
true or false? - 🧠ANSWER ✔✔true
3
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
