Java variable is data container which is used to store data values. Variable is a name of memory location. There are three types of variables in java: local, instance and static.
There are different types of variables in Java
- int - stores integers (whole numbers) like 11,22,-44,-55 etc.
- float - stores floating point numbers with decimals like 55.32 or -53.23 etc.
- String - stores text value like "good morning". String values are surrounded by double quotes(" ").
- boolean - stores values true or false.
- char - stores single characters like 'm' or 'N'. Char values are surrounded by single quotes(' ').
Declaring Variables
You can define variable using data type as below.
int phonenum = 9428982251;
System.out.println(phonenum);
String country = "india";
System.out.println(country);
float cost =99.67;
System.out.println(cost);
boolean isFail = true;
System.out.println(isFail);
char firstLetter = 'A';
System.out.println(firstLetter);
Types of Variables
There are three types of variables in Java
- local variable
- instance variable
- static variable
1) Local Variable
A variable declared inside the body of the method is called local variable. we can use this variable only within that method and the other methods in the class.
A local variable cannot be defined with "static" keyword.
2) Instance Variable
A variable declared inside the class but outside the body of the method is called an instance variable. It is not declared as static
3) Static variable
A variable that is declared as static is called a static variable. Static variable can be defined by "static" keyword. You don't need to create object to access Static variable.
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