Data types in Java are fundamental elements that define the type and size of values that may be stored as variables. Java data types are crucial to any Java programmer as they directly affect how data is stored and manipulated in Java programs. Java is statically typed, which means variables must be declared and their types cannot be changed during the execution of a program. Java data types can be divided into two categories: primitive types, and reference types. Let’s explore each of these categories in more detail. https://www.sevenmentor.com/java-training-classes-in-pune.php Primitive Data Types The primitive data types are defined by the language. They are named with a keyword. These are the most basic data types that you can use in Java.
Byte: A byte is an 8-bit integer with two-significance. Its minimum and maximum values are -128 (inclusive) and 127 (exclusive). It can be used to save memory when large arrays are needed. You can use it in place of and when their limits are helpful to your code.
short is a 16-bit signed two-complement integer. Its minimum value is -32 768, and its maximum value is 32 767 inclusive. It can be used in large arrays to save memory, just like bytes.
it is probably the most common data type. int represents a signed 32-bit integer with two complements. The minimum value is -231, and the maximum value is 231-1. This data type is useful when you require a wider range of values than byte or short.
long is a two-symbol 64-bit integer. Its range is wide, ranging from -263 up to 263-1. This makes it useful when you want a wider range than int.
float The float datatype is a 32-bit IEEE 754 single-precision floating-point number. This data type is primarily used to conserve memory when dealing with large arrays. It should not be used to represent precise values such as currency.
double is a 64-bit IEEE 754 double precision floating point data type. This is the standard data type for decimal values. It offers a good combination of precision, range, and accuracy. Boolean The boolean datatype has only two values: true or false. Use it for simple flags to track true/false conditions.
char is a 16-bit Unicode single-character data type. Its minimum value is ‘u0000 (or 0), and its maximum value is ‘uffff (or 65 535 inclusive).
Reference Data Types Reference types are objects and arrays. Reference types are different from primitive data types in that they do not store a value but rather a reference. They can therefore refer to any object that is of the type declared or subtype. Null is the default value for any reference data type. Reference data types include:
Arrays are containers that hold a set number of values. The array’s length is fixed when it is created, and cannot be altered later.
Class: A class in Java is a blueprint that allows for the creation of individual objects. Each object can have its unique set of attributes (data) and functions (functions) that define its behavior.
Interfaces is a Java reference type that can only contain constants, method names, default methods, and static methods. Interfaces are not allowed to contain instance fields. Interfaces cannot contain instance fields. Java Classes in Pune
Enums: Introduced with Java 5, enums allow you to define a collection of constants. Enums make code easier to read and safer.