Java Variables
Variables are containers for storing data values.
In Java, there are diverse varieties of variables, for example:
String -stores text, such as "Hello". String values are surrounded by double quotes
int-stores integers (whole numbers), without decimals, such as 123 or -123float-stores floating point numbers, with decimals, such as 19.99 or -19.99char- stores single characters, such as 'a' or 'B'. char values are surrounded by single quotesboolean- stores values with two states: true or false
To generate a variable, you should identify the type and reserve it a value:
Syntax-type
variableName = value;From the above line of code type describes java variables type for example int or String furthermore variableName is the name of the variable ... for example- name or sowmii etcc....
the equal to sign on the right hand side shows the value reserved for the variable.......
for example String name = "sowmiii";
String= variable type
name=variable name
sowmii=value of the variable
To create a variable that should store text, look at the following example:
Example -1
public static void main(String[] args) {
String name = "Java";
System.out.println(name);
}
}
Output-Java
To create a variable that should store a number, look at the following example:
Example-2
Create a variable called number of type int and assign it the value 45-
public class Main {
public static void main(String[] args) {
int number= 45;
System.out.println(number);
}
}
15 Output-45
You can also announce or declare a variable without assigning the value and assign the value the later.......
Example
public class Main {
public static void main(String[] args) {
int number;
number= 45;
System.out.println(number);
}
}
Output-45
Note that if you allocate a new value to an existing variable, it will overwrite the previous value:
Example
Change
the value of number from 45 to 80:
public class Main {
public static void main(String[] args) {
int number = 45;
number = 80; // number is now 80
System.out.println(number);
}
}
Output-80
Final Variables
If you don't want anyone to overwrite existing values, use the final keyword (this will announce the variable as "final" or "constant", which means permanent and read-only):
Example
public class Main {
public static void main(String[] args) {
final int number= 15;
number= 20; // will generate an error
System.out.println(number);
}
}
output: Main.java :4: error: cannot assign a value to final variable number
number =20;
^
1 error
Other Types
A trail of how to declare variables of other types:
Example
int number= 5;
float number = 5.99f;
char number = 'D';
boolean bool= true;
String text = "Hello";Related articles
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