Java Introduction to Variables and Primitive Data Types | Java Tutorial for Beginners
Introduction to Variables in Java - Java Primitive Types Overview for Beginners -
Java primitive types hold data specified by the user, and the data held in these variables is mutable and thus can be modified. There are many types of primitive types in Java. Today, we will discuss how to declare and initialize a variable in Java, we will discuss bits, shorts, ints, longs, floating point types such as floats and doubles, characters such as chars, and boolean values, or switches, such as booleans. We will discuss how to change the value held by a variable and how to modify variable values using arithmetic functions in Java.
Code from Video:
public class Main
{
public static void main(String args[])
{
/*
Declaring Variables -
type variableName;
*/
/*
Initializing variables -
type variableName = value;
*/
//integers
byte b = 0;
//8 bits - stores nums and chars from ASCII Table
short s = 0;
//16 bits
int i = 0;
//32 bits
long l = 0L;
//64 bits
//floating points 0.0 54.4 10.9
float f = 0.0f;
//32 bits
double d = 0.0;
//64 bits
//characters
char c = 'a';
//16 bits - stores nums and chars from Unicode
//booleans
boolean bool = false;
//1 bit
//variable manipulation
bool = true;
i = 10;
i = 20;
i = 10 + 10;
//you can change the values of variables easily
//you can also use multiple variables to do basic math functions
int numOne = 5;
int numTwo = 10;
int num = numOne * numTwo;
// num = 5 x 10 : * - + /
//* - + /
}
}
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Timestamps:
00:00 Intro to Variables in Java
1:02 Declare and Initialize Variables in Java
2:40 Different Types of Primitive Data Types in Java
7:20 How to Change Values of Variables in Java
8:34 Basic Arithmetic Functions Using Primitive Data Types in Java
12:18 Quick Takeaways From This Video
12:59 Outro
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