How to put java code in html

- January 31, 2025

You can include Java code in HTML in several ways, depending on what you're trying to achieve. Here are some common methods:

1. Using `<pre>` and `<code>` to Display Java Code (Without Executing It)

If you just want to display Java code inside an HTML page, you can use the <pre> and <code> tags:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Display Java Code</title>
</head>
<body>
    <h2>Java Code Inside HTML</h2>
    <pre>
        <code>
public class Main {
    public static void main(String[] args) {
        System.out.println("Hello, World!");
    }
}
        </code>
    </pre>
</body>
</html>

<pre> preserves formatting and spacing in the code.
<code> provides semantic meaning for programming code.

2. Running Java Code Inside HTML Using JavaScript (With WebAssembly or Java Applet)

If you want to run Java code directly inside HTML, it’s not possible natively, because browsers do not support Java by default. However, there are workarounds like:

Using WebAssembly with Java (e.g., GraalVM).
Using Java Applet (deprecated and no longer supported in modern browsers).
Using JavaScript to simulate Java code execution.

Example of simulating Java code execution using JavaScript:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Simulating Java in JavaScript</title>
</head>
<body>
    <h2>Simulating Java Code Inside HTML</h2>
    <script>
        class Main {
            static main() {
                console.log("Hello, World! (Simulated Java in JavaScript)");
            }
        }
        Main.main();
    </script>
</body>
</html>

This is not real Java, but it mimics Java’s structure using JavaScript.

3. Running Java Code Inside HTML Using Java Server Pages (JSP)

If you're building a web application with Java, you can use JSP (Java Server Pages) to embed Java code within an HTML page.

Example using JSP:

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<!DOCTYPE html>
<html>
<head>
    <title>JSP Page</title>
</head>
<body>
    <h2>Java Code Inside HTML Using JSP</h2>
    <%
        out.println("Hello, World! from JSP");
    %>
</body>
</html>

This requires a Java application server like Apache Tomcat to run.

Which Solution is Best for You?

If you only want to display Java code: Use <pre> and <code>.
If you want to run Java in a web environment: Use JSP or WebAssembly.
If you want to experiment with Java inside HTML without a server: Use JavaScript to simulate the code.

Do you have a specific goal in mind?

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