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 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.
Types of Variable
There are three types of variables in java:
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
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:
Why char uses 2 byte in java and what is \u0000 ?
It is because java uses Unicode system than ASCII code system. The \u0000 is the lowest range of Unicode system. To get detail explanation about Unicode visit next page.
Java Variable Example: Add Two Numbers
Java Variable Example: Widening
Java Variable Example: Narrowing (Typecasting)
Java Variable Example: Overflow
Java Variable Example: Adding Lower Type