Variables in Java | Java Variables - Java Tutorial 12

Notes for You:: Variables in Java.
- is a named memory location, whose value can change during the execution of a program.

- While developing any software application using Java; we come across different types of data and data values.
- In order to store and process different types of data & data values computer uses its memory (RAM).
- To allocate a chunk of memory and access it within a Java program, we need to declare a variable or a constant.

Declaring a variable or a constant:
- means allocating a memory location for some data.

Initializing a variable or a constant:
- means assigning the initial value to that allocated memory location.

Syntax for Declaring a variable in Java:
datatype nameOfVariable;
Example:
int playerScore;
int playerHealth;

Note:
- In Java, default value of a variable depends upon the type of a variable .
- byte (0) , short (0), int (0), long (0L),
- float (0.0f), double (0.0d)
- char (‘\0’)
- boolean (false)
- Any reference (null)


Note:
- Before using a local variable it has to be initialized or assigned with some meaningful value.

Syntax for Declaring and Initializing a variable:
datatype nameOfVariable = ivalue;
Example:
int playerScore = 0;
int playerHealth = 100;

Syntax for Assigning new value to a variable:
nameOfVariable = newvalue;
Example:
playerScore = 10;
playerHealth = 80;


Syntax for declaring multiple variables:
datatype nameOfVariable1, nameOfVariable2,...;
Example:
int playerScore, playerHealth;


Syntax for declaring & initializing multiple variables:
datatype nameOfVariable1 = ivalue, nameOfVariable2 = ivalue,…;
Example:
int playerScore=0, playerHealth=100;

Example Code:

package variablesdemo;

public class VariablesDemo {

public static void main(String[] args) {
/*
int playerScore;
int playerHealth;
System.out.println("player score = " + playerScore); // error
System.out.println("player health = " + playerHealth);// error


int playerScore=0;
int playerHealth=100;
System.out.println("player score = " + playerScore); // 0
System.out.println("player health = " + playerHealth);// 100

playerScore = 10;
playerHealth = 80;

System.out.println("player score = " + playerScore); // 10
System.out.println("player health = " + playerHealth);// 80
*/

int playerScore=0, playerHealth=100;
System.out.println("player score = " + playerScore); // 0
System.out.println("player health = " + playerHealth);// 100

playerScore = 30;
playerHealth = 70;

System.out.println("player score = " + playerScore); // 30
System.out.println("player health = " + playerHealth);// 70
}
}


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Follow the link for next video:
Java Tutorial 13 - Constants in Java Programming Language | Java Constants
https://youtu.be/qzmBbClw7KE

Follow the link for previous video:
Java Tutorial 11 - Identifiers in Java Programming Language | Java Naming Conventions
https://youtu.be/OQIfLSEy32Q

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