Java: Data Types and Variables

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What is the purpose of using constants in a program?

To display variable values on the screen

To perform concatenation operations on strings

To store variables that can be modified during program execution

To hold fixed values that do not change during program execution (correct)

Which keyword precedes the declaration of a constant in Java?

static

final (correct)

const

var

What is the convention for naming constants in Java?

Snake case

All uppercase letters (correct)

All lowercase letters

CamelCase

Which data items do constants represent?

Values that cannot be modified during program execution Signup and view all the answers

What is the purpose of the concatenation operator in Java?

To combine two or more strings into one Signup and view all the answers

Which keyword is used to output variable values on the screen in Java?

System.out.print Signup and view all the answers

What will happen if an attempt is made to modify a constant value in a program?

It will result in a compilation error Signup and view all the answers

When declaring constants, what does the keyword 'final' indicate?

'final' indicates that the value is constant and cannot be modified Signup and view all the answers

What is the purpose of using symbolic constants in programming?

To hold fixed values that do not change during program execution Signup and view all the answers

What is the primary advantage of using constants in programming?

Enhancing code readability and maintainability Signup and view all the answers

What is a variable in Java?

A memory location with a name that holds a value of a specified type Signup and view all the answers

Which Java data type allows for very small integers?

byte Signup and view all the answers

What is the range of values for the Java type 'long'?

-9223372036854775808 to 9223372036854775807 Signup and view all the answers

Which Java data type is used for storing real numbers with greater precision?

double Signup and view all the answers

What is the main purpose of declaring variables in a Java program?

To provide storage locations for data items Signup and view all the answers

What are the simple data types in Java often referred to as?

Primitive or scalar types Signup and view all the answers

What is the size of the Java data type 'long'?

8 bytes Signup and view all the answers

Which Java data type allows for very small integers?

byte Signup and view all the answers

What is the correct way to declare a variable in Java?

dataType variableName ; Signup and view all the answers

What is the rule for naming identifiers in Java?

No spaces allowed Signup and view all the answers

What is the good programming practice for variable and method names in Java?

Start with lowercase letter Signup and view all the answers

What should you do to initialize a variable with an initial value in Java?

Combine the assignment statement with a declaration Signup and view all the answers

Java: Data Types and Variables

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Questions and Answers

What is the purpose of using constants in a program?

Which keyword precedes the declaration of a constant in Java?

What is the convention for naming constants in Java?

Which data items do constants represent?

What is the purpose of the concatenation operator in Java?

Which keyword is used to output variable values on the screen in Java?

What will happen if an attempt is made to modify a constant value in a program?

When declaring constants, what does the keyword 'final' indicate?

What is the purpose of using symbolic constants in programming?

What is the primary advantage of using constants in programming?

What is a variable in Java?

Which Java data type allows for very small integers?

What is the range of values for the Java type 'long'?

Which Java data type is used for storing real numbers with greater precision?

What is the main purpose of declaring variables in a Java program?

What are the simple data types in Java often referred to as?

What is the size of the Java data type 'long'?

Which Java data type allows for very small integers?

What is the correct way to declare a variable in Java?

What is the rule for naming identifiers in Java?

What is the good programming practice for variable and method names in Java?

What should you do to initialize a variable with an initial value in Java?

What is the correct way to assign a value to a character variable in Java?

Which command is used to output a message on the screen in Java?

Which data type should be used to hold real numbers in Java?

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