Java Variables - Variables in Java

Java Variables - Variables in Java

  • Variables are containers for storing data values.
  • In Java, there are different types 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 -123
    • float - Stores floating point numbers, with decimals, such as 19.99 or -19.99
    • char - Stores single characters, such as 'a' or 'B'. Char values are surrounded by single quotes
    • boolean - Stores values with two states: true or false

Declaring (Creating) Variables

  • To create a variable, you must specify the type and assign it a value:


type variable name = “kaashiv”;
  • Where type is one of Java's types (such as int or String), and variableName is the name of the variable (such as x or name). The equal sign is used to assign values to the variable.
  • To create a variable that should store text, look at the following example


Create a variable called name of type String and assign it the value "kaashiv":

String name = “ kaashiv”



Final Variables

  • If you don't want others (or yourself) to overwrite existing values, use the final keyword (this will declare the variable as "final" or "constant", which means unchangeable and read-only):


final int myNum=15;
myNum=20//will generate an error:cannot assign a value to final variable

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