Java Programming Concepts Review

Flashcards covering key concepts from Java programming, including primitive types, boolean expressions, and coding problems.

Default value of uninitialized int in Java

0

Primitive type for true/false values

Boolean

Declaration for a String variable named 'name'

String name;

Primitive type for decimal numbers

double

Result of 10 / 4 in integer division

2

Declaration for a boolean variable named 'isActive'

boolean isActive;

What happens when an int is divided by a double?

It auto casts to double.

Default value of a boolean in Java

false

Primitive types on the AP Test

int, double, boolean

Result of 3.0 / 2 in Java

1.5

Result of true || false

True

Result of true && false

False

Evaluation of !(x == 5) when x = 5

False

Boolean expression for x not between 10 and 20 inclusive

!(x >= 10 && x <= 20)

Result of !(a > 5 || b < 3) when a = 6 and b = 2

False

Simplification of !(x && y) using De Morgan's Law

!x || !y

Simplification of !(a || b) using De Morgan's Law

!a && !b

Simplification of !(x > 5 && y < 10) using De Morgan's Law

!x || y >= 10

Output of System.out.println(a / 2 * 2) when a = 7

6

Issue with 'double value = 3.7; int num = value;'

Cannot assign a double to an int without explicit casting.

Code to declare int variable 8, cast to double and print

int num = 8; double result = (double) num; System.out.println(result);

Boolean expression for x divisible by 3 but not by 5

x % 3 == 0 && x % 5 != 0

Output when x = 5 and x > 3 && x < 10

Orange

Result of ! (10 > 5 || 2 < 3)

False

Result when x = 8, y = 6 for x == 8 || y != 5 && y == 6

True

Default value of uninitialized int variable in Java

0

Primitive type for true/false values

Boolean

Valid declaration for a String variable

String name;

Primitive type for storing decimal numbers

double

Result of 10 / 4 in integer division

2

Declaration of a boolean variable

boolean isActive;

Result when dividing an int by a double

It auto casts to double.

Default value of a boolean in Java

false

Primitive types on the AP Test

int, double, boolean

Result of 3.0 / 2 in Java

1.5

Result of true || false

True

Result of true && false

False

Evaluation of !(x == 5) when x = 5

False

Boolean expression that checks if x is not between 10 and 20 inclusive

!(x >= 10 && x <= 20)

Result of !(a > 5 || b < 3) when a = 6 and b = 2

False

Simplified expression of !(x && y) using De Morgan's Law

!x || !y

Simplified expression of !(a || b) using De Morgan's Law

!a && !b

Simplified expression of !(x > 5 && y < 10) using De Morgan's Law

!x || y >= 10

Output of code int a = 7; System.out.println(a / 2 * 2);

6

Problem in code double value = 3.7; int num = value;

Cannot assign a double to an int without explicit casting.

Code to declare an int variable with value 8 and cast to double

int num = 8; double result = (double) num; System.out.println(result);

Boolean expression to check if x is divisible by 3 but not by 5

x % 3 == 0 && x % 5 != 0

Output of code int x = 5; if (x > 3 && x < 10)…

Orange

Output of code boolean result = ! (10 > 5 || 2 < 3); System.out.println(result);

false

Output of expression x == 8 || y != 5 && y == 6 when x = 8 and y = 6

true