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Examples

A complete Java example supplies an executable source unit, its declared release, expected behavior and the limits of its model.

A complete Java example supplies an executable source unit, its declared release, expected behavior and the limits of its model.

Learning roadmap

Read a complete small program and predict its output. Open a topic below, try its example, then check the result.

What comes next

Use the subject bar to move between the tutorial, advanced topics and practice resources. Each section has its own module list. This section links 16 written lessons and self-checks. The coverage map records the remaining scope; this curriculum is not an exhaustive Java reference.

Working through this section

The curriculum below groups the canonical pages for this section. Open a lesson to see its release label, operation contract and connected topics. Examples can also be linked from another section without creating a second copy of the same page.

Compile the stated program with a compatible JDK and compare its result with the displayed output. Read the rejected-input and ownership clauses before changing the input. Local self-checks and downloaded programs do not imply a server-side code judge or a production service.

Curriculum

Read a complete small program and predict its output.

  1. 1Your first Java program

Work through endpoint behavior, traversal, and failure cases.

  1. 1Java LinkedList programs and expected output

Open complete programs in their relevant subject sections.

  1. 1Java console input: Scanner tokens, lines and validation
  2. 2Java Unicode: code units, code points and UTF-8 bytes
  3. 3Java EnumMap and EnumSet: finite-state storage
  4. 4Java CompletableFuture: composition, failures and executor ownership
  5. 5Java file project: validate a manifest before producing a summary

Open canonical lesson programs and download their source.

  1. 1Java class loaders: type identity, delegation and initialization
  2. 2Java file channels: buffer positions and partial transfers
  3. 3Java sockets: connection deadlines, framing and stream ownership
  4. 4Java HTTP client project: a real local response and status-aware handling
  5. 5Java database project: one receipt and its aggregate in one transaction

Open the canonical lessons and download their exact source.

  1. 1Java HTTPS project: a trusted local certificate and a rejected hostname
  2. 2Java heap diagnostics: retained objects, histograms and a controlled dump
  3. 3Java 25 compact source files: an instance main with explicit input limits

Check accepted input, ownership and failure behavior with the complete program.

  1. 1Java BufferedImage: deterministic raster output without a window
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