#java variables

Just like we have some rules that we follow to speak English (the grammar), we have some rules to follow while writing a Java program. This set of these rules is called syntax. It’s like Vocabulary and Grammar of Java. Variables A variable is a container that stores a value.This value can be changed during the execution of the program.Example: int number = 8; (Here, int is a data type, the…

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Data Types in Java

In this post, I am going to discuss Data Types in Java programming language. Humans know the difference between “54321” and “zyxwv”. But a machine does not know it. We use Data Types in computer programming to dictate what a variable or object can hold. We use Data types in all programming languages including C, C++, Java.

In the previous post, I have told you that you have to declare the Data…

Types of Variables in Java

In this post, I am going to talk about the types of Java variables. In Java language, we normally see three kinds of variables.

They are :

Instance Variable

Static Variable

Local Variable

Instance Variables

An instance variable is a variable declared inside a class, but outside a method. In object-oriented programming with classes, an instance variable is a variable defined in a class…

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Java Classes, Objects, Methods & Variables

Java Objects, Classes, Methods & Variables

Java Objects, Classes, Methods & Variables

Java Classes:

Java classes represent properties and behaviors of any concept. It is a blue print used to define attributes and abilities of particular entity. For example, we want to define a car as a java class. We need to find out its functionality and components first. A car has wheels, breaks, accelerator, fuel, engine etc. All these can be the attributes of a car. A car can move forward, backward, right & left etc. these are the basic functionalities/methods for a car.

Java Objects:

Java objects define a variable of a particular java class. Like a class, Java objects have states and behaviors. For example, we have a Mazda RX8 Sports Car and we want to code it. Before that, we need to define a class which has all the specs, then make a variable of that class and name it as Mazda Rx8 which is treated as an object of class car.

java-object-class-methods-and-variables

package javaexamples; /** * * @author Ahsan([email protected]) */ public class Car // Car is a class that represents basic structure of actual car. String model; // data attributes for a car. String type; int breaks, accelator, clutch; public void left() // methods that represents car's behaviour. public void right() public void move() public void stop() public static void main(String[] args) Car mazdaRX8 = new Car(); // mazdaRX8 is an object of class Car

Java Methods:

Java Methods are the blue prints that hide all the implementations of any operation. We just need to call them with respective parameters, it will compute and return the required result. The main purpose of Java methods is to avoid coupling and code redundancy. It keeps source code concrete and easy to maintain. For example, we want calculate sum, difference, product and division of two numbers. One way is to write code that has two operands along with respective operators to compute results. But what if we want to do it several times. Notice you have used sample approach with different inputs. To tackle this, make a function and move all the statements in it, now you can call it as many times you want to.

package javaexamples; public class caculator public static int add(int op1, int op2) int result = op1 + op2; return result; public static int minus(int op1, int op2) int result = op1 - op2; return result; public static int product(int op1, int op2) int result = op1 * op2; return result; public static int divide(int op1, int op2) int result = (op2 > 0) ? op1 / op2 : 0; return result; public static void main(String[] args) // TODO code application logic here int op1 = 2, op2 = 3; System.out.println("Add :" + add(op1,op2)); System.out.println("Minus :" + minus(op1,op2)); System.out.println("Product :" + product(op1,op2)); System.out.println("Divide :" + divide(op1,op2));

Java Variables: