Variables and Data Types in Java

Variable is a name of memory location.

There are three types of variables in java: local, instance and static.

There are two types of data types in java: primitive and non-primitive.

Variable :-

Variable is name of reserved area allocated in memory. In other words, it is a name of memory location. It is a combination of "vary + able" that means its value can be changed.

1. int data=50;//Here data is variable

Types of Variable :-

There are three types of variables in java:

• local variable

• instance variable

• static variable

1) Local Variable

A variable which is declared inside the method is called local variable.

2) Instance Variable

A variable which is declared inside the class but outside the method, is called instance variable . It is not declared as static.

3) Static variable

A variable that is declared as static is called static variable. It cannot be local.

We will have detailed learning of these variables in next chapters.

Example to understand the types of variables in java

1. class A{

2. int data=50;//instance variable

3. static int m=100;//static variable

4. void method(){

5. int n=90;//local variable

6. }

7. }//end of class

---

Data Types in Java :-

Data types represent the different values to be stored in the variable. In java, there are two types of data types:

• Primitive data types

• Non-primitive data types

Java Variable Example: Add Two Numbers

1. class Simple{

2. public static void main(String[] args){

3. int a=10;

4. int b=10;

5. int c=a+b;

6. System.out.println(c);

7. }}

Output: 20

#programming #decoding #coding #java #jdk