The Complete Software Tester: Concepts, Skills, and Strategies for High-Quality Testing by Unknown

Author:Unknown
Language: eng
Format: epub
Published: 2021-12-12T00:00:00+00:00

Chapter 62: Coding Definitions

One of the things I struggled with when learning to code was knowing the difference between a class, an object, and a method. Through personal experience and web searches, I have come up with the following explanation.

A class is the basic building block of software. It consists of variables and methods.

Here ’ s an example of a class:

class Cat { //this is the class

//these are the variables in the Cat class

var name;

var age;

var weight;

var color;

//these are the methods in the Cat class

eat() {

}

sleep() {

}

meow() {

}

} //this marks the end of the Cat class

A variable is a little bit of memory that stores a value to be used in a program. A string is a bit of text, like “ Hello!” or “ rainbow”. In the Cat class, the string variables we have are name (the name of the cat) and color (the color of the cat). An int is an integer, like 7 or 13. In the Cat class, the int variables we have are age (the age of the cat) and weight (the weight of the cat).

An object is an instance of a class. If we want our program to create and use a cat instance, we need to create a Cat object:

//this is where we create the new Cat object

var Fluffy = new Cat() //Fluffy is the variable name given to the Cat object

}

A method is a task or group of tasks. If you are familiar with mathematical functions, you might want to think of a method as a function. In the Cat class, the methods are eat(), sleep(), and meow(). The parentheses after the method name indicate what kind of parameter will be passed to the method. In this case, eat(), sleep(), and meow() do not require a parameter, so the parentheses are empty.

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