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Mastering Java Variables: A Beginner’s Guide to Understanding and Applying Variables in Java

Understanding and Applying Variables in Java

Learn Java Variables

Java Variables are containers that are used to store data values.

In Java, there are various types of variables, as given below:

  • String: It stores text, for example, “Hello”. String values are provided using double quotes.
  • Int: It stores integers, all whole numbers, without decimals, such as 145 or -145.
  • Float: It is used to store floating point numbers with decimals, such as 29.99 or -29.99.
  • Char: It is used to store single characters, such as ‘a’ or ‘B’. Char values are provided using a single quote.
  • Boolean: It is used to store values with two states: true or false.

 

Creating or Declaring Variables

If you want to create or declare a variable, you must specify your variable type & assign some specific value to it:

 

Syntax

type variable_Name = value;

Example

String Name = "Ram";

Where type is one of Java’s types. In the above, the code sample type is String, variable_Name is Name, and Value is Ram. To assign some value to variable_name, we use the equal sign “=”.

We can use type java variable for int, float, char and boolen and we will give you sample codes below.

 

/* Code Sample for int */

type variable_Name = value;

//Example for int

int number= "10";

 

/* Code Sample for float*/

type variable_Name = value;

//Example for float

int number= "10.25";

 

/* Code Sample for char*/

type variable_Name = value;

//Example for char

char myLetter = 'H';

 

/* Code Sample for Boolean*/

type variable_Name = value;

//Example for Boolean

boolean myBool = true;

 

Now Let’s create a variable that should store text; look at the following example:

 

Examples

Create a variable called the name of type String and assign it the value “Ram”:

/* Example for String*/

public class First{

  public static void main(String[] args) {

    String name = "Ram";

    System.out.println(name);

  }

}

type name java variable

 

/* Example for Int*/

public class First{

  public static void main(String[] args) {

   int number = 256;
   System.out.println(number);

  }

}

type int java variable

 

 

/* Example for Float*/

public class First{

  public static void main(String[] args) {

 float number = 256.5465f;
 System.out.println(number);

  }

}

type float java variable

 

 

/* Example for Double*/

public class First{

  public static void main(String[] args) {

  double number = 256.5465569856546;

  System.out.println(number);

  }

}

type double java variable

 

/* Example for Boolean*/

public class First{

  public static void main(String[] args) {

      boolean myBool = true;
       System.out.println(myBool);

  }

}

 

type boolean java variable

 

 

/* Example for Char*/

public class First{

  public static void main(String[] args) { 

 char myLetter = 'H';
 System.out.println(myLetter);

  }

}

type char java variable

 

Caused: java.io.IOException: Cannot run program “nohup” (in directory “C:\ProgramData\Jenkins”): CreateProcess error=2

Learn Java Non-Primitive Data Type

Learn Java Characters

Learn Java Boolean Data Types

Learn Java Type Casting