Front
What is the result of
int x = 5 / 2; in Java?Back
2
Integer division truncates the decimal;
5 / 2 is 2, not 2.5.Public Deck
AP Computer Science A - 50 Java Concepts
Master AP Computer Science A with 50 flashcards covering Java fundamentals, OOP, arrays, recursion, and algorithms.
AnyFlashcards50 cards
Preview
Front
How do you compare two
String objects for equality in Java?Back
.equals() method
if (str1.equals(str2)) checks content; == checks if they are the same memory reference.Front
What is the value of
Integer.MAX_VALUE + 1?Back
Integer.MIN_VALUE
This is known as integer overflow, wrapping around to the minimum possible value.
Front
What does
String.substring(2, 5) return for the string "Computer"?Back
"mpu"
Includes index 2 ('m') up to but NOT including index 5 ('t').
Front
What is the result of
(double) 1 / 4?Back
0.25
Casting one operand to double forces floating-point division.
Front
Is a
String object mutable or immutable?Back
Immutable
Once created, a String's value cannot be changed; methods like
toUpperCase() return a new String.Front
What is the result of
"1" + 2 + 3?Back
"123"
String concatenation occurs from left to right;
"1" + 2 becomes "12", then "12" + 3.Front
What is the purpose of the
final keyword when declaring a variable?Back
To create a constant
final int X = 10; prevents the value of X from being reassigned.Front
What is 'short-circuit evaluation' in the context of
&&?Back
Skipping the second operand if the first is false
if (false && 5/0 == 0) will not throw an error because the second part is never evaluated.Front
According to De Morgan's Laws,
!(A && B) is equivalent to what?Back
!A || !B
Negate both terms and flip the operator from AND to OR.
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