How do I compile and run these Java programs?

Install a JDK, compile with javac Main.java, then run with java Main.

Which Java version are these examples compatible with?

Examples target Java 8+, including lambdas and streams.

Can I safely copy and modify the examples?

Yes. Copy, modify inputs, and observe outputs to reinforce concepts.

Do these programs work on all platforms?

Programs compile and run on Windows, macOS, and Linux with a standard JDK.

Array Algorithms and Utilities

Practice sorting, searching, and aggregations with arrays. Learn core algorithms like linear and binary search plus utility patterns for data processing.

Java Program to Sort an Array

Program (Java)

Example & Expected Output

Sorts an integer array using Arrays.sort.

[1, 3, 5, 8]

Program Output

Java Program to Compute Average of Array

Program (Java)

Example & Expected Output

Calculates average value of elements in an array.

25.0

Program Output

Java Program to Perform Linear Search

Program (Java)

Example & Expected Output

Finds the index of target element by scanning.

Program Output

Java Program to Perform Binary Search

Program (Java)

Example & Expected Output

Searches a sorted array using binary search.

Program Output

Java Program Using ArrayList

Program (Java)

Example & Expected Output

Demonstrates basic operations with ArrayList.

[apple, banana, cherry]
true

Program Output

Java Program to Reverse a String

Program (Java)

Example & Expected Output

Reverses a string using StringBuilder.

avaJ

Program Output

Frequently Asked Questions

Install a JDK (Java Development Kit), then compile with javac Main.java and run with java Main. On macOS, Linux, or Windows, use the official OpenJDK builds or your package manager.

The examples target modern Java (Java 8 and above). If you use older versions, most examples will still work, but features like lambdas and streams require Java 8+.

Yes. These examples are intended for learning. Copy the code, experiment with changes (e.g., different inputs), and observe the output to deepen your understanding of Java fundamentals.

Yes. Java is platform-independent. The examples compile and run on major platforms (Windows, macOS, Linux) with a standard JDK.

Learn Java the Practical Way

Java powers enterprise applications, Android development, and countless backend systems. Practicing small, focused programs builds fluency with syntax and core concepts such as data types, control flow, methods, classes, interfaces, exceptions, collections, and streams.

On this page, you will find clean, well-formatted examples that run across platforms. Each example includes a short description and expected output so you can quickly verify your understanding. Explore the topics via the sidebar and extend the code to experiment further.

Whether you are preparing for interviews, working through coursework, or refreshing fundamentals, these examples offer a practical path to mastering Java. Bookmark the page and return often to keep improving.