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Loops.html
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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">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Java Loops - Technical Documentation</title>
<style>
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font-family: Arial, sans-serif;
line-height: 1.6;
background-color: #f4f4f4;
margin: 0;
padding: 0;
}
header {
background-color: #333;
color: #fff;
padding: 1rem;
text-align: center;
}
h1 {
margin-top: 0;
}
nav {
background-color: #444;
padding: 1rem;
}
nav a {
color: #fff;
text-decoration: none;
padding: 0.5rem;
display: inline-block;
}
nav a:hover {
background-color: #555;
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main {
padding: 2rem;
}
section {
margin-bottom: 2rem;
}
code {
background-color: #eaeaea;
padding: 0.2rem 0.4rem;
font-size: 1rem;
display: inline-block;
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pre {
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overflow-x: auto;
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footer {
background-color: #333;
color: #fff;
text-align: center;
padding: 1rem;
position: fixed;
bottom: 0;
width: 100%;
}
</style>
</head>
<body>
<header>
<h1>Java Loops - Technical Documentation</h1>
</header>
<nav>
<a href="#introduction">Introduction</a>
<a href="#while-loop">While Loop</a>
<a href="#do-while-loop">Do-While Loop</a>
<a href="#for-loop">For Loop</a>
<a href="#enhanced-for-loop">Enhanced For Loop</a>
<a href="#use-cases">Use Cases</a>
</nav>
<main>
<section id="introduction">
<h2>Introduction</h2>
<p>
Loops are essential structures in Java that allow you to execute a block of code repeatedly. Depending on the condition provided, the loop will continue executing as long as the condition is met. Java offers several types of loops, such as <code>while</code>, <code>do-while</code>, <code>for</code>, and the enhanced <code>for</code> loop. Each loop is used for specific situations and optimizations. Let's explore them in detail.
</p>
</section>
<section id="while-loop">
<h2>While Loop</h2>
<p>
The <code>while</code> loop is one of the most basic loops in Java. It checks the condition before the block of code is executed. If the condition evaluates to <code>true</code>, the loop runs; otherwise, it terminates.
</p>
<h3>Syntax:</h3>
<pre><code>
while (condition) {
// code block to be executed
}
</code></pre>
<h3>Example:</h3>
<pre><code>
int i = 0;
while (i < 5) {
System.out.println(i);
i++;
}
</code></pre>
<p>Output:</p>
<pre><code>
0
1
2
3
4
</code></pre>
<p>
The above code prints numbers from 0 to 4, incrementing <code>i</code> each time. The loop runs as long as <code>i</code> is less than 5.
</p>
</section>
<section id="do-while-loop">
<h2>Do-While Loop</h2>
<p>
The <code>do-while</code> loop is similar to the <code>while</code> loop but differs in one key aspect: it guarantees that the block of code is executed at least once, even if the condition is <code>false</code>.
</p>
<h3>Syntax:</h3>
<pre><code>
do {
// code block to be executed
} while (condition);
</code></pre>
<h3>Example:</h3>
<pre><code>
int i = 0;
do {
System.out.println(i);
i++;
} while (i < 5);
</code></pre>
<p>Output:</p>
<pre><code>
0
1
2
3
4
</code></pre>
<p>
This loop behaves like the <code>while</code> loop, except it prints at least once, even if the condition is not met initially.
</p>
</section>
<section id="for-loop">
<h2>For Loop</h2>
<p>
The <code>for</code> loop is used when you know the number of iterations in advance. It allows you to define the initialization, condition, and increment/decrement in a single line, making it very powerful for iterating over a range of values.
</p>
<h3>Syntax:</h3>
<pre><code>
for (initialization; condition; increment/decrement) {
// code block to be executed
}
</code></pre>
<h3>Example:</h3>
<pre><code>
for (int i = 0; i < 5; i++) {
System.out.println(i);
}
</code></pre>
<p>Output:</p>
<pre><code>
0
1
2
3
4
</code></pre>
<p>
The <code>for</code> loop runs exactly 5 times, starting at <code>i = 0</code> and increasing <code>i</code> by 1 each iteration until <code>i < 5</code>.
</p>
</section>
<section id="enhanced-for-loop">
<h2>Enhanced For Loop</h2>
<p>
Also known as the <code>for-each</code> loop, the enhanced <code>for</code> loop is used primarily for iterating through arrays or collections. It eliminates the need for a counter or index variable, making it simpler and safer to use when you want to access each element of an array or collection.
</p>
<h3>Syntax:</h3>
<pre><code>
for (type variable : array/collection) {
// code block to be executed
}
</code></pre>
<h3>Example:</h3>
<pre><code>
int[] numbers = {1, 2, 3, 4, 5};
for (int num : numbers) {
System.out.println(num);
}
</code></pre>
<p>Output:</p>
<pre><code>
1
2
3
4
5
</code></pre>
<p>
The enhanced <code>for</code> loop iterates through each element in the array and prints it, simplifying the loop operation for arrays and collections.
</p>
</section>
<section id="use-cases">
<h2>Use Cases</h2>
<p>
Loops are useful in a wide range of programming scenarios, including:
</p>
<ul>
<li>Iterating through elements in an array or collection.</li>
<li>Executing code multiple times until a condition is met.</li>
<li>Building infinite loops for background tasks (with exit conditions).</li>
<li>Processing user inputs or reading files until the end of the file is reached.</li>
</ul>
<p>Choosing the right loop type depends on the situation and how the loop condition is structured.</p>
</section>
</main>
<footer>
<p>Java Loops - Technical Documentation | © 2024</p>
</footer>
</body>
</html>