Which of the following is a primitive data type in Java?

Java MCQ: Which of the following is a primitive data type in Java?

Answer:

Explanation:

In Java, int is one of the eight primitive data types, which are the most basic data types available in the language. Primitive types in Java are predefined by the language and named by a keyword. They serve as the building blocks for data manipulation in Java. The eight primitive data types include byte, short, int, long, float, double, char, and boolean. These types differ from objects like String and Array, which are reference types that store memory addresses rather than actual data values.

The int data type is specifically designed for storing 32-bit signed integers, which can represent values from -2³¹ to 2³¹-1. It is often used in situations where you need to store whole numbers without decimals. For example, if you need to keep track of a counter or index, an int is usually the best choice due to its balance between range and memory efficiency. Here’s a simple example:

int counter = 10;
System.out.println(counter); // Outputs: 10

Unlike objects such as String and Array, primitive types do not require instantiation using the new keyword, which makes them faster and more efficient. They are directly stored in the memory location assigned to the variable, unlike objects that store references to the memory location where the actual data is stored.

Choosing the correct primitive type is crucial for optimizing memory usage and ensuring that your program runs efficiently. For instance, using an int when you only need a byte could lead to unnecessary memory consumption. Thus, understanding the differences between primitive types and when to use each is key to writing effective Java programs.

Reference links:

https://www.javaguides.net/p/java-tutorial-learn-java-programming.html