Java is a programming language for building digital things. Inside this programming language, you have basic tools called "data types" that help you store different information. Simple tools like numbers, letters, and true/false values are for small jobs. For bigger projects, you have tools to group and organize information, like boxes for holding many numbers or blueprints for creating custom parts. Knowing how to use these data types in Java is essential to building strong and efficient digital structures.
In Java, these data types hold different kinds of information. Each data type has a specific size and shape to fit certain things. For example, a numbered data type can hold whole numbers, while another can hold decimal numbers.
There are two prominent Java data types: simple ones and complex ones. Simple data types can only hold one piece of information at a time, like a single number or letter. Complex types can have multiple pieces of information or even other data types. Understanding these containers is necessary because it helps you decide what kind of information your Java programs will work with.
Here, we will define two kinds of data types supported by Java, Primitive data types and non-primitive data types. First, we will elaborate on the Primitive data types and then discuss the second in detail. Just follow the sequence to clear your doubts.
They are the simplest forms of data that the language understands directly. Each type has a specific size and range of values it can hold.
Types of Primitive Data Types in Java
char variable_name;
Key Points:
Example
byte age = 25; // Stores an age as a byte
int salary = 50000; // Stores a salary as an int
double pi = 3.14159; // Stores pi as a double
char initial = 'A'; // Stores a character
boolean isStudent = true; // Stores a boolean value
In short, primitive data types are the fundamental data structures in Java that provide the foundation for building more complex data types and applications.
Unlike Primitive data types, there are other data types in Java called non-primitive data types. Instead of holding the information directly, they have a kind of map that points to where the information is stored in the computer's memory. Moreover, you create these containers yourself, and they can contain more complex things than the Primitive data types containers we talked about earlier. We'll explore these Java all data types in more detail soon.
data_type array_name[array_size];
public class Main {
public static void main(String[] args) {
String greeting = "Welcome to ScholarHat";
System.out.println(greeting);
}
}
access_modifier class
{
data members
methods
}
public class ScholarHat {
int x = 50;
public static void main(String[] args) {
ScholarHat myObj = new ScholarHat();
System.out.println(myObj.x);
}
}
In summary, non-primitive data types are essential for building complex applications in Java. They allow you to organize and manage data efficiently.
Here, we will discuss various examples of all data types in Java programming language.
Example 1:
{
public static void main(String[] args) throws IOException {
int a = 10;
short s = 2;
byte b = 6;
long l = 125362133223l;
float f = 65.20298f;
double d = 876.765d;
System.out.println("The integer variable is " + a);
System.out.println("The short variable is " + s);
System.out.println("The byte variable is " + b);
System.out.println("The long variable is " + l);
System.out.println("The float variable is " + f);
System.out.println("The double variable is " + d);
}
}
Example 2:
class ByteExample {
public static void main(String[] args) {
byte n, a;
n = 127;
a=177;
System.out.println(n); // prints 127
System.out.println(a); // throws an error because it cannot store more than 127 bits
}
}
Example 3:
public class ClassCarExample {
// Instance variables or fields
String color;
int speed;
//Method start that gets the car started
public void start() {
System.out.println("The car has started.");
}
//Method accelerate that increases the speed of the car by 10 km/h
public void accelerate() {
speed += 10;
System.out.println("The car is accelerating. Current speed: " + speed + " km/h");
}
//Method brake that reduces the speed of the car by 5 each time the method is called
public void brake() {
speed -= 5;
System.out.println("The car is braking. Current speed: " + speed + " km/h");
}
}
Data types in Java are the foundation. Moreover, they determine the kind of information you can store and manipulate. Understanding data types is crucial for building efficient and effective code, from simple numbers and characters to complex structures like arrays and objects. By carefully selecting the right data type for each piece of information, you can optimize memory usage, improve performance, and create robust applications. Mastering data types is essential for any Java programmer.
Ans. Java has keywords that have specific meanings. However, you can't use them for other things like naming your variables or functions. They're essential for telling the computer what to do.
Ans. You can put different kinds of things in these Java variables. For example, you can store words like "Hello" in a " greeting " box. In programming, these boxes are called variables, and the things you put in them are called values.
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UpskillCampus provides career assistance facilities not only with their courses but with their applications from Salary builder to Career assistance, they also help School students with what an individual needs to opt for a better career.
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