Which of the following is NOT a Java primitive type?

Answer: String <codeString</code is a class (reference type), not a primitive. AP CSA primitives: <codeint</code, <codedouble</code, <codeboolean</code.

Which line correctly declares an integer variable named <codecount</code initialized to 10?

Answer: int count = 10; Java syntax: <code<type <name = <value;</code with a single <code=</code for assignment.

A <codeboolean</code variable in Java can hold

Answer: true or false Java booleans are strictly <codetrue</code or <codefalse</code; not 0/1 like in some languages.

AP Computer Science A · Topic 1.2

Variables and Data Types Practice

Q: Which of the following is NOT a Java primitive type?

Answer: String <codeString</code is a class (reference type), not a primitive. AP CSA primitives: <codeint</code, <codedouble</code, <codeboolean</code.

Q: Which line correctly declares an integer variable named <codecount</code initialized to 10?

Answer: int count = 10; Java syntax: <code<type <name = <value;</code with a single <code=</code for assignment.

Q: A <codeboolean</code variable in Java can hold

Answer: true or false Java booleans are strictly <codetrue</code or <codefalse</code; not 0/1 like in some languages.

Part of Primitive Types.

Practice questions

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Sample questions

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Sample 1difficulty 1/5
$Which of the following is NOT a Java primitive type?$
- A
  $boolean$
- B
  $double$
- C
  $int$
- D
  $String$
  check_circle
Why
$<code> String </code> is a class (reference type), not a primitive. AP CSA primitives: <code> int </code>, <code> double </code>, <code> boolean </code> .$
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Sample 2difficulty 1/5
$Which line correctly declares an integer variable named <code> count </code> initialized to 10?$
- A
  $int count == 10;$
- B
  $count int = 10;$
- C
  $integer count = 10;$
- D
  $int count = 10;$
  check_circle
Why
$Java syntax: <code> <type> <name> = <value>; </code> with a single <code> = </code> for assignment.$
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Sample 3difficulty 1/5
$A <code> boolean </code> variable in Java can hold$
- A
  $Any int$
- B
  $true or false$
  check_circle
- C
  $Any String$
- D
  $0 or 1$
Why
$Java booleans are strictly <code> true </code> or <code> false </code>; not 0/1 like in some languages.$
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Sample 4difficulty 2/5
```
boolean a = true;
boolean b = false;
System.out.println(a && !b);
```
$What is printed?$
- A
  $true$
  check_circle
- B
  $false$
- C
  $0$
- D
  $1$
Why
$!b is true, and true && true is true.$
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Sample 5difficulty 2/5
$Which is NOT a valid Java identifier?$
- A
  $2nd$
  check_circle
- B
  $myVar$
- C
  $_count$
- D
  $$total$
Why
$Identifiers cannot begin with a digit; can start with letter, <code>_</code>, or <code> $ </code> .$
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