Which of the Following Is Not a Valid Java Data Type?


Larry Thompson

Which of the Following Is Not a Valid Java Data Type?

In Java, data types are used to define the type of data that a variable can hold. Java has several built-in data types, including int, double, boolean, and char.

However, not all combinations of letters can be used as valid data types in Java. In this article, we will explore which of the following is not a valid Java data type.

The List of Java Data Types:

Before we dive into identifying the invalid data type, let’s quickly review the list of valid Java data types:

  • byte: represents an 8-bit signed integer.
  • short: represents a 16-bit signed integer.
  • int: represents a 32-bit signed integer.
  • long: represents a 64-bit signed integer.
  • float: represents a single-precision floating-point number.
  • double: represents a double-precision floating-point number.
  • boolean: represents either true or false.
  • char: represents a single character.

The Invalid Data Type:

Now that we have listed all the valid Java data types, let’s identify the invalid one among the following options:

  • xYZ:
  • yZx;
  • Zxy7;

Among the given options, “yZx;” is not a valid Java data type. In Java, data types must follow certain naming conventions. They should start with a letter, followed by letters, digits, or underscores.

Additionally, they cannot be a reserved keyword in Java, such as “int” or “boolean.” Data types are case-sensitive in Java, so “yZx” is not the same as “YZX”.

Remember that choosing appropriate and meaningful variable names is essential for writing clear and maintainable code. It is good practice to use descriptive names that reflect the purpose of the variable.


In conclusion, among the given options, “yZx;” is not a valid Java data type. Understanding the valid data types in Java and following the naming conventions will help you write clean and error-free code.

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