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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Java Basics - The Checklist</title>
<link href="https://api.fontshare.com/v2/css?f[]=nunito@400&f[]=bebas-neue@400&display=swap" rel="stylesheet">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/css/all.min.css"
integrity="sha512-iBBXm8fW90+nuLcSKlbmrPcLa0OT92xO1BIsZ+ywDWZCvqsWgccV3gFoRBv0z+8dLJgyAHIhR35VZc2oM/gI1w=="
crossorigin="anonymous" referrerpolicy="no-referrer" />
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<link rel="icon" href="./resources/Yellow Abstract Cooking Fire Free Logo.png" />
<link rel="stylesheet" href="styles.css">
<link rel="stylesheet" href="dark-mode.css">
<link rel="stylesheet" href="code-snippet.css"> <!-- Add the code snippet CSS file -->
<link rel="stylesheet" href="scrollbar.css">
</head>
<body>
<header>
<h1><a href="index.html">The Checklist</a></h1>
</header>
<nav>
<button class="dark-mode-toggle">
<i class="sun-icon"></i>
<i class="moon-icon"></i>
</button>
</nav>
<main>
<section class="checklist">
<h2>Java Basics</h2>
<ul>
<!-- Example 1: Introduction to Java -->
<li class="checklist-item">
<div class="section">
<div class="section-box">
<label class="section-box-label">
<input type="checkbox" class="checkbox" data-checklist="java-basics">
<span class="checkmark"></span>
</label>
</div>
<div class="section-title">
<label class="section-title-label">
Introduction to Java
<span class="dropdown-arrow"></span>
</label>
</div>
</div>
<div class="hidden-text code-snippet" data-example="1">
<p>
Java is a versatile and widely used programming language known for its portability and ease of use. It's
widely used for developing web and mobile applications, enterprise software, and more.
</p>
<pre class="code-block">
public class HelloWorld {
public static main(String[] args) {
System.out.println("Hello, Java!");
}}
</pre>
<button class="copy-button" onclick="copyToClipboard(1)">Copy</button>
</div>
</li>
<!-- Example 2: Variables and Data Types in Java -->
<li class="checklist-item">
<div class="section">
<div class="section-box">
<label class="section-box-label">
<input type="checkbox" class="checkbox" data-checklist="java-basics">
<span class="checkmark"></span>
</label>
</div>
<div class="section-title">
<label class="section-title-label">
Variables and Data Types in Java
<span class="dropdown-arrow"></span>
</label>
</div>
</div>
<div class="hidden-text code-snippet" data-example="2">
<p>
Variables in Java store data, while data types define the kind of data a variable can hold. Common data
types include int, double, and String, among others.
</p>
<pre class="code-block">
int age = 30;
double price = 19.99;
String name = "Amit Aryan";
</pre>
<button class="copy-button" onclick="copyToClipboard(2)">Copy</button>
</div>
</li>
<!-- Example 3: Operators in Java -->
<li class="checklist-item">
<div class="section">
<div class="section-box">
<label class="section-box-label">
<input type="checkbox" class="checkbox" data-checklist="java-basics">
<span class="checkmark"></span>
</label>
</div>
<div class="section-title">
<label class="section-title-label">
Operators in Java
<span class="dropdown-arrow"></span>
</label>
</div>
</div>
<div class="hidden-text code-snippet" data-example="3">
<p>
Operators in Java perform various operations, including arithmetic, comparison, and logical operations.
These are essential for manipulating data and making decisions in your programs.
</p>
<pre class="code-block">
int a = 10;
int b = 5;
int result = a + b; // result will be 15
</pre>
<button class="copy-button" onclick="copyToClipboard(3)">Copy</button>
</div>
</li>
<!-- Example 4: Control Structures in Java -->
<li class="checklist-item">
<div class="section">
<div class="section-box">
<label class="section-box-label">
<input type="checkbox" class="checkbox" data-checklist="java-basics">
<span class="checkmark"></span>
</label>
</div>
<div class="section-title">
<label class="section-title-label">
Control Structures in Java
<span class="dropdown-arrow"></span>
</label>
</div>
</div>
<div class="hidden-text code-snippet" data-example="4">
<p>
Control structures like if-else, switch, and loops (for, while, do-while) help in controlling the flow of
your Java programs, allowing you to make decisions and repeat actions as needed.
</p>
<pre class="code-block">
if (condition) {
// Code to execute when the condition is true
} else {
// Code to execute when the condition is false
}
</pre>
<button class="copy-button" onclick="copyToClipboard(4)">Copy</button>
</div>
</li>
<!-- Example 5: Functions (Methods) in Java -->
<li class="checklist-item">
<div class="section">
<div class="section-box">
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<input type="checkbox" class="checkbox" data-checklist="java-basics">
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</label>
</div>
<div class="section-title">
<label class="section-title-label">
Functions (Methods) in Java
<span class="dropdown-arrow"></span>
</label>
</div>
</div>
<div class="hidden-text code-snippet" data-example="5">
<p>
Functions (methods) are reusable blocks of code that perform specific tasks. They improve code
organization and make it easier to maintain and understand.
</p>
<pre class="code-block">
public int add(int a, int b) {
return a + b;
}
</pre>
<button class="copy-button" onclick="copyToClipboard(5)">Copy</button>
</div>
</li>
<!-- Example 6: Arrays in Java -->
<li class="checklist-item">
<div class="section">
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</label>
</div>
<div class="section-title">
<label class="section-title-label">
Arrays in Java
<span class="dropdown-arrow"></span>
</label>
</div>
</div>
<div class="hidden-text code-snippet" data-example="6">
<p>
Arrays are used to store multiple values of the same type in Java. They are fundamental for working with
collections of data.
</p>
<pre class="code-block">
int[] numbers = {1, 2, 3, 4, 5};
</pre>
<button class="copy-button" onclick="copyToClipboard(6)">Copy</button>
</div>
</li>
<!-- Example 7: Object-Oriented Programming (OOP) in Java -->
<li class="checklist-item">
<div class="section">
<div class="section-box">
<label class="section-box-label">
<input type="checkbox" class="checkbox" data-checklist="java-basics">
<span class="checkmark"></span>
</label>
</div>
<div class="section-title">
<label class="section-title-label">
Object-Oriented Programming (OOP) in Java
<span class="dropdown-arrow"></span>
</label>
</div>
</div>
<div class="hidden-text code-snippet" data-example="7">
<p>
Object-Oriented Programming (OOP) is a paradigm in Java that focuses on creating objects and classes. This
concept helps in organizing and modeling real-world entities.
</p>
<pre class="code-block">
class Person {
String name;
int age;
public Person(String name, int age) {
this.name = name;
this.age = age;
}
}
</pre>
<button class="copy-button" onclick="copyToClipboard(7)">Copy</button>
</div>
</li>
<!-- Example 8: Inheritance in Java -->
<li class="checklist-item">
<div class="section">
<div class="section-box">
<label class="section-box-label">
<input type="checkbox" class="checkbox" data-checklist="java-basics">
<span class="checkmark"></span>
</label>
</div>
<div class="section-title">
<label class="section-title-label">
Inheritance in Java
<span class="dropdown-arrow"></span>
</label>
</div>
</div>
<div class="hidden-text code-snippet" data-example="8">
<p>
Inheritance allows one class (subclass or derived class) to inherit attributes and methods from another
class (superclass or base class). It facilitates code reuse and extensibility.
</p>
<pre class="code-block">
class Vehicle {
String brand;
public Vehicle(String brand) {
this.brand = brand;
}
}
class Car extends Vehicle {
int speed;
public Car(String brand, int speed) {
super(brand);
this.speed = speed;
}
}
</pre>
<button class="copy-button" onclick="copyToClipboard(8)">Copy</button>
</div>
</li>
<!-- Example 9: Polymorphism in Java -->
<li class="checklist-item">
<div class="section">
<div class="section-box">
<label class="section-box-label">
<input type="checkbox" class="checkbox" data-checklist="java-basics">
<span class="checkmark"></span>
</label>
</div>
<div class="section-title">
<label class="section-title-label">
Polymorphism in Java
<span class="dropdown-arrow"></span>
</label>
</div>
</div>
<div class="hidden-text code-snippet" data-example="9">
<p>
Polymorphism enables objects of different classes to be treated as objects of a common superclass. This
promotes flexibility and dynamic method invocation in Java programs.
</p>
<pre class="code-block">
class Animal {
public void sound() {
System.out.println("Animal makes a sound");
}
}
class Dog extends Animal {
public void sound() {
System.out.println("Dog barks");
}
}
class Cat extends Animal {
public void sound() {
System.out.println("Cat meows");
}
</pre>
<button class="copy-button" onclick="copyToClipboard(9)">Copy</button>
</div>
</li>
<!-- Example-10:exception handeling in java -->
<li class="checklist-item">
<div class="section">
<div class="section-box">
<label class="section-box-label">
<input type="checkbox" class="checkbox" data-checklist="java-basics">
<span class="checkmark"></span>
</label>
</div>
<div class="section-title">
<label class="section-title-label">
Exception Handeing in Java
<span class="dropdown-arrow"></span>
</label>
</div>
</div>
<div class="hidden-text code-snippet" data-example="9">
<p>
Sometimes, while executing programs, we get errors that influence the normal working of the program. Such
errors are called exceptions and the method used to deal with these exceptions is known as exception
handling.
<p>
<h2>Exception -Handeling types and their code-snippet </h2>
<pre class="code-block">
//1.************ try..catch************
public class TryCatch {
public static void main(String[] args) {
try {
int result = 36/0;
} catch(ArithmeticException e) {
System.out.println("Error: " + e.getMessage());
}
}
}
//2.*******Multiple catchpublic class MultipleCatch********
public static void main(String[] args) {
try {
int result = 36/0;
} catch(NullPointerException e1) {
System.out.println("Error: " + e1.getMessage());
} catch(ArithmeticException e2) {
System.out.println("Error: " + e2.getMessage());
}
}
//3.********try... finally***********
public class TryFinally {
public static void main(String[] args) {
try {
int result = 36/0;
} finally {
int result = 36/6;
System.out.println("Finally block result:" + result);
}
}
}
//4.********try.....catch....finally*********
public class TryCatchFinally {
public static void main(String[] args) {
try {
int result = 36/0;
} catch(ArithmeticException e) {
System.out.println("Error: " + e.getMessage());
} finally {
int result = 36/6;
System.out.println("Finally block result:" + result);
}
}
}
//5.********throws***********
public class Throws {
public static void example() throws ArithmeticException {
int result = 36/0;
}
public static void main(String[] args) {
try {
example();
} catch (ArithmeticException e) {
System.out.println(e);
}
}
}
//6.********throw**********
public class Throw {
public static void example() {
throw new ArithmeticException("divide by 0");
}
public static void main(String[] args) {
example();
}
}
</pre>
<button class="copy-button" onclick="copyToClipboard(9)">Copy</button>
</div>
</li>
</ul>
</section>
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