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Introduction
We will
explore the various data types supported by Java.
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| Introduction of Data Types |
1. Data Types
In
programming, every value has an associated type known as a data type. Java
supports two main categories of data types:
- Primitive Data Types
- Non-Primitive Data Types
Primitive Data Types:
Primitive
data types are predefined by Java and include:
- boolean
- char
- byte
- short
- int
- long
- float
- double
These
data types define how values are stored and manipulated in a program. For
example, mathematical operations can be performed on numeric data types.
Boolean :
A Boolean
represents one of two possible values, such as true or false.
class
Main {
public static void main(String[] args) {
boolean canLearn = true;
System.out.println(canLearn);
}
}
Output: true
Char:
The char data type stores a single character and must be
enclosed in single quotes.
char alphabet = 'A';
Byte:
The byte data type stores small integer values within the
range -128 to 127.
byte points = 100;
Short:
The short data type stores integers from -32,768 to 32,767.
short number = 28745;
Int:
The int data type is commonly used to store whole numbers.
int distance = 2036372;
Long:
The long data type stores large integer values and requires
an L suffix.
long area = 203637254L;
Float:
The float data type stores decimal values with up to 7
digits of precision and requires an f suffix.
float height = 5.10f;
Double:
The double data type stores decimal values with up to 16
digits of precision.
double length = 5.112;
double breadth = 9.2345D;
Non-Primitive Data Types:
Non-primitive
data types store multiple values and are defined by the programmer. Common
non-primitive types include:
- String
- Class
- Array
String:
A String is a sequence of characters enclosed in double
quotes.
String name = "Raj";
Common Mistake:
Using
single quotes instead of double quotes for String values
will result in an error:
class
Main {
public static void main(String[] args) {
String name = 'Raj'; // Incorrect
System.out.println(name);
}
}
Output: Compilation error: unclosed character literal
Corrected Code:
class
Main {
public static void main(String[] args) {
String name = "Raj";
System.out.println(name);
}
}
Output: Raj
Summary
- Primitive Data Types: boolean, char, byte, short,
int, long, float, double.
- Non-Primitive Data Types: String, Array, Class.
These
data types form the foundation of Java programming, allowing efficient data
storage and manipulation.
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