Java Variables

Syntax

data type variableName = value;

Example

public class Example {
   public static void main(String[] args) {
      int num = 10;
      String name = "John";
      System.out.println("Num is:" + num + " and Name is:" + name);
   }
}

Output

Num is: 10 and Name is: John

Explanation

A Java variable is a named memory location that can hold a value of a specific data type. The syntax for declaring a variable in Java is as follows:

data type variableName = value;

Here, the data type specifies the type of value that the variable can hold, such as int, float, or String. The variable name is the name of the variable, and the value is the initial value that the variable holds.

In the example above, we have declared two variables, num and name. The data type of num is int, and its value is 10. The data type of name is String, and its value is "John". We then print the values of these two variables using the System.out.println() method.

Use

Variables in Java are used to store data values that can be used throughout your program. They are used to temporarily store data, perform calculations, and perform operations on data. Variables can also be used to pass data between different parts of a program and to communicate the state of a program to other parts of the program.

Important points

• A variable is a named memory location that can hold a value of a specific data type.
• The syntax for declaring a variable is data type variableName = value;.
• Variables can be used to store data values, perform calculations, and pass data between different parts of a program.
• Variable names are case sensitive.
• Java is a strongly-typed language, which means that variables must be declared with a data type, and that data type cannot be changed later.

Summary

Java variables are an essential part of programming in Java. They are used to store data values, perform calculations, and pass data between different parts of a program. The syntax for declaring a variable is simple and straightforward, and there are many different data types to choose from, depending on the type of data you need to store. Understanding variables is crucial for anyone learning Java or programming in general.