Java: Data Types and Variables
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Questions and Answers

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?

<p>Values that cannot be modified during program execution (D)</p> Signup and view all the answers

What is the purpose of the concatenation operator in Java?

<p>To combine two or more strings into one (B)</p> Signup and view all the answers

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

<p>System.out.print (B)</p> Signup and view all the answers

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

<p>It will result in a compilation error (B)</p> Signup and view all the answers

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

<p>'final' indicates that the value is constant and cannot be modified (C)</p> Signup and view all the answers

What is the purpose of using symbolic constants in programming?

<p>To hold fixed values that do not change during program execution (B)</p> Signup and view all the answers

What is the primary advantage of using constants in programming?

<p>Enhancing code readability and maintainability (A)</p> Signup and view all the answers

What is a variable in Java?

<p>A memory location with a name that holds a value of a specified type (A)</p> Signup and view all the answers

Which Java data type allows for very small integers?

<p>byte (B)</p> Signup and view all the answers

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

<p>-9223372036854775808 to 9223372036854775807 (B)</p> Signup and view all the answers

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

<p>double (C)</p> Signup and view all the answers

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

<p>To provide storage locations for data items (C)</p> Signup and view all the answers

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

<p>Primitive or scalar types (D)</p> Signup and view all the answers

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

<p>8 bytes (D)</p> Signup and view all the answers

Which Java data type allows for very small integers?

<p>byte (D)</p> Signup and view all the answers

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

<p>dataType variableName ; (C)</p> Signup and view all the answers

What is the rule for naming identifiers in Java?

<p>No spaces allowed (B)</p> Signup and view all the answers

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

<p>Start with lowercase letter (C)</p> Signup and view all the answers

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

<p>Combine the assignment statement with a declaration (C)</p> Signup and view all the answers

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

<p>'char level = 'A';' (C)</p> Signup and view all the answers

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

<p>'System.out.print(&quot;Hello world&quot;);' (D)</p> Signup and view all the answers

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

<p>'double' (B)</p> Signup and view all the answers

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