Java Syntax and Programming Basics

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Questions and Answers

Which of the following is NOT a type of variable in Java, as described in the provided content?

Local Variable

Static Variable

Instance Variable

Global Variable (correct)

What distinguishes a static variable from an instance variable in Java?

Static variables are used to store constant values, while instance variables store changing values.

Static variables are declared inside methods, while instance variables are declared outside.

Static variables can be accessed directly using the class name, while instance variables require an object instance to access. (correct)

Static variables are specific to each instance of a class, while instance variables are shared across all instances.

If you were to write a program to track the number of students enrolled in a course, which type of variable would be most suitable for this purpose?

Global Variable

Local Variable

Instance Variable

Static Variable (correct)

What is the value of 'a' after the following code snippet executes?

int a = 10;
a = 5;

5 (D) Signup and view all the answers

Which of the following is a valid arithmetic operator in Java?

// Invalid operator
int result = 5 ** 3; // Exponent

% (B), + (D) Signup and view all the answers

What is the result of the following code snippet?

System.out.println(60 % 9);

7 (D) Signup and view all the answers

What is the purpose of the '+= ' operator in Java?

Add the value on the right to the variable on the left and assign the result to the variable on the left (B) Signup and view all the answers

What is the value of 'c' after the following code snippet executes?

int a = 10;
int b = 5;
c = a + b;

15 (B) Signup and view all the answers

Which of the following operators is used to find the remainder of a division operation?

% (D) Signup and view all the answers

What is the value of 'b' after the following code snippet executes?

int a = 20;
b = a--;

20 (B) Signup and view all the answers

What type of operator is used to calculate the total price in the provided example?

Arithmetic operator (B) Signup and view all the answers

Which of the following is NOT considered an operand in the example provided?

System.out.println (B) Signup and view all the answers

What will be the output of the code snippet that calculates the total price?

Total price : 100 (A) Signup and view all the answers

In the context of the provided example, which of the following describes the '=' symbol?

Assignment operator (D) Signup and view all the answers

Which variable in the example represents a local variable?

age (C) Signup and view all the answers

What does the unary operator '++' do to a variable?

Increases the variable's value by 1 (C) Signup and view all the answers

Which of the following describes the behavior of the '&&' operator?

It short-circuits if the first operand is false (A) Signup and view all the answers

What will the expression '5 < 3' evaluate to?

False (D) Signup and view all the answers

What is the effect of using the '~' operator on a boolean value?

It flips the boolean value from true to false or vice versa (D) Signup and view all the answers

Which operator would you use to check if two values are not equal?

!= (A) Signup and view all the answers

What does the relational operator '>=' signify?

Greater than or equal to (C) Signup and view all the answers

If 'counter' is initialized to 10, what will 'System.out.print(counter++)' output?

10 (B) Signup and view all the answers

What will the bitwise complement operator '~' return when applied to the binary value '00000000'?

11111111 (A) Signup and view all the answers

Which of the following identifiers is valid in Java?

USER_NAME (C) Signup and view all the answers

What is an identifier in Java?

A name given to variables, classes, methods, and other program elements. (D) Signup and view all the answers

Which of the following is a valid identifier rule in Java?

Identifiers cannot be reserved keywords. (C) Signup and view all the answers

Which of the following is an example of a valid Java identifier?

userName (D) Signup and view all the answers

Why are reserved words in Java significant for naming identifiers?

Reserved words have predefined meanings in Java and cannot be redefined. (A) Signup and view all the answers

Which of the following is a reserved word in Java?

int (A) Signup and view all the answers

Which of these options is a valid way to declare a variable in Java?

All of the above (D) Signup and view all the answers

What is the difference between the identifiers 'userName' and 'UserName'?

Java is case sensitive, so both identifiers are considered distinctly different. (A) Signup and view all the answers

What is an instance variable in Java?

A variable that is unique to each instance of a class. (D) Signup and view all the answers

What distinguishes a static variable from a local variable?

Static variables retain their values across all instances, while local variables are temporary. (A) Signup and view all the answers

Which of the following correctly describes a local variable?

It is only accessible within the method or block in which it is declared. (D) Signup and view all the answers

In the example provided, which line(s) represent an instance variable?

Lines 2 and 3 (A) Signup and view all the answers

What will be the value of 'count' after creating two instances of the Employee class if 'count' is a static variable initialized to 0?

0 (A) Signup and view all the answers

Flashcards

Variable

A container that holds a value temporarily which can be changed in a program.

Instance Variable

A variable declared inside a class but outside any method, constructor, or block.

Static Variable

A class variable declared with the static modifier, indicating a single copy exists across all instances.