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ICSE Class 8 Java Data Types and Variables — practice questions

Explore 28 free Java Data Types and Variables questions in ICSE Class 8 Computer Applications. Open each question or exercise to read its content, reference answers and available explanation.

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Java Data Types and Variables questions and exercises with answers

Showing questions 1–28 of 28.

Which logical values can a boolean variable hold in Java?Read the answer and worked solution →Which characteristic describes how Java treats identifier letter casing?Read the answer and worked solution →How is a variable declared according to standard Java language syntax?Read the answer and worked solution →Which suffix specifies that an integer literal is interpreted as a long?Read the answer and worked solution →Which keyword introduced in Java 10 infers variable types automatically?Read the answer and worked solution →What value does a Java reference variable hold when pointing to nothing?Read the answer and worked solution →Where can fields, also known as class variables, be declared in Java?Read the answer and worked solution →Which field modifier permits a variable to be initialized only once?Read the answer and worked solution →What are variables formally defined as in Java programming syntax?Read the answer and worked solution →What term describes data types that are not primitive in computer science?Read the answer and worked solution →What precisions do the Java floating-point types float and double have?Read the answer and worked solution →Why are primitive data types not considered objects in Java?Read the answer and worked solution →Why were unsigned integer data types omitted from the Java language?Read the answer and worked solution →Which symbol category can be validly included inside a Java identifier?Read the answer and worked solution →How many Java words are strict keywords that cannot name any identifier?Read the answer and worked solution →What data type is assigned to the null literal in the Java language?Read the answer and worked solution →Where is an object created when its constructor is executed in Java?Read the answer and worked solution →Which field modifier ensures all threads see a consistent variable value?Read the answer and worked solution →Which modifier specifies that a field will not be serialized in Java?Read the answer and worked solution →Which class represents numeric values convertible to Java primitive types?Read the answer and worked solution →How is char categorized in the JVM primitive type specification?Read the answer and worked solution →Which JVM primitive type cannot be accessed from Java source code?Read the answer and worked solution →How many char values represent a Unicode code point in a surrogate pair?Read the answer and worked solution →Which letter represents the boolean primitive type in JVM type signatures?Read the answer and worked solution →Match each primitive Java data type with its memory size in bytes:Read the answer and worked solution →Match each Java data type with its default initial value:Read the answer and worked solution →Match each type conversion term with its mechanism in Java:Read the answer and worked solution →Match each variable naming rule in Java with its specification:Read the answer and worked solution →

Worked practice questions

Which logical values can a boolean variable hold in Java?

  1. true and false
  2. 0 and 1 values
  3. yes and no tags
  4. high and low bit
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Correct answer: A. true and false

A Java boolean variable is a logical type that only stores true or false.

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Which characteristic describes how Java treats identifier letter casing?

  1. Accent-sensitive
  2. Format-neutral
  3. Case-sensitive
  4. Case-insensitive
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Correct answer: C. Case-sensitive

Java identifiers are case-sensitive so uppercase and lowercase names differ.

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How is a variable declared according to standard Java language syntax?

  1. Using memory size
  2. Writing type and name
  3. Using call keyword
  4. Writing index address
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Correct answer: B. Writing type and name

Variables in Java are declared by specifying their data type followed by their name.

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