Java Example Programs

Learn Java with
runnable examples.

Clear explanations, complete source code and sample output — from your first program to OOP, collections, threads and data structures.

ArrayList.java

ArrayList<String> list = new ArrayList<>();
list.add("Java");

Main.java

public class Main {
 public static void main(String[] args) {
 System.out.println("Hello, Java!");
 }
}

Thread.java

new Thread(() -> {
 System.out.println("Run");
}).start();

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Java Basics

Start with your first Java program, data types, variables and operators — each topic includes runnable code and sample output.

51 articles View all topics

Basic Programs First programs, constructors, methods and simple class examples. 21 tutorials Data Type Programs byte, short, int, long, float, double, char and boolean examples. 8 tutorials Variable Programs Local, instance and static variables with clear examples. 2 tutorials Operator Programs Arithmetic, relational, logical, assignment and increment/decrement operators. 20 tutorials

Conditional

Control flow with if/else, switch, loops, jump statements and Java access specifiers.

16 articles View all topics

Access Specifier Programs public, private, protected and default access in Java classes. 4 tutorials Conditional Statement Programs if, if-else, if-else-if, switch and ternary operator examples. 5 tutorials Loop Programs for, while, do-while, enhanced for and nested loop examples. 5 tutorials Jump Statement Programs break, continue and return with practical examples. 2 tutorials

Array and String

Work with arrays and strings — creation, traversal, manipulation and common utilities.

29 articles View all topics

Array Programs Simple, multidimensional and matrix operations in Java. 5 tutorials String Programs String comparison, concatenation, substring, reverse and character handling. 24 tutorials

OOPS

Object-oriented Java — inheritance, polymorphism, interfaces, exceptions, collections, threads and I/O.

62 articles View all topics

OOPS Programs Classes, objects, inheritance, polymorphism, encapsulation and abstraction. 10 tutorials Exception Handling Programs try-catch-finally, throw, throws, custom exceptions and common runtime errors. 19 tutorials Java Collection Programs ArrayList, HashMap, HashSet, TreeMap, Queue and related collection APIs. 23 tutorials Thread Programs Thread creation, sleep, wait/notify and deadlock examples. 3 tutorials Java Files And Input Output Programs Readers, writers, streams and file handling in Java. 7 tutorials

Miscellaneous

Patterns, conversions, calculations and assorted useful Java programs.

49 articles View all topics

Miscellaneous Programs Prime numbers, factorial, palindrome, GCD, LCM and more. 9 tutorials Pattern Programs Triangles, Floyd's triangle, Pascal triangle and star patterns. 9 tutorials Conversion Programs Temperature, case, string/array conversions and date formatting. 4 tutorials Calculation Programs Area, circumference, averages and numeric calculations. 27 tutorials

Data Structure

Stacks, queues, linked lists, searching and sorting algorithms in Java.

16 articles View all topics

Data Structure Programs Stack, queue, linked list and binary search implementations. 10 tutorials Sorting Programs Bubble, selection, insertion, merge, quick and heap sort. 6 tutorials

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Learn Java with runnable examples.

Learn Java with
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