Programming TIPS!

A site on Java API Examples and TIPS.

Java TIPS

Basics of Record class (December 21, 2024)
Don't use the legacy File class, use new I/O APIs instead (August 14, 2024)
Delete a directory with contents (August 8, 2024)
How to Use the Simple Web Server (jwebserver) (July 10, 2024)
Get the current time (October 11, 2023)
Use TimeUnit.sleep instead of Thread.sleep (July 1, 2023)
Simple Builder Design Pattern (July 1, 2023)
An exhaustive list of format strings (May 20, 2023)
Basics of Date and Time (May 13, 2023)
Don't use the legacy Date and Calendar classes, use new APIs instead (May 13, 2023)
Use System.nanoTime to measure elapsed time (May 13, 2023)

Index

@
- @FunctionalInterface (annotation) (September 29, 2023)
- @Override (annotation) (September 26, 2023)
- @SafeVarargs (annotation) (October 9, 2023)
- @SuppressWarnings (annotation) (October 18, 2023)
A
- AbstractCollection (December 18, 2024)
- AbstractInterruptibleChannel (November 7, 2024)
- AbstractList (December 25, 2024)
- AbstractMap (December 21, 2024)
- AbstractMap.SimpleEntry (December 29, 2024)
- AbstractMap.SimpleImmutableEntry (January 14, 2025)
- AbstractQueue (December 26, 2024)
- AbstractSequentialList (January 18, 2025)
- AbstractSet (December 26, 2024)
- AccessibleObject (July 8, 2023)
- Adler32 (March 25, 2025)
- AnnotatedElement (September 24, 2023)
- Appendable (February 11, 2024)
- ArithmeticException (May 27, 2023)
- ArrayBlockingQueue (June 30, 2023)
- ArrayDeque (February 8, 2025)
- ArrayIndexOutOfBoundsException (April 15, 2024)
- ArrayList (December 18, 2024)
- Arrays (April 8, 2023)
- ArrayStoreException (October 5, 2023)
- Attr (XML) (September 4, 2024)
- AutoCloseable (April 2, 2025)
B
- Base64 (March 11, 2025)
- Base64.Decoder (March 11, 2025)
- Base64.Encoder (March 11, 2025)
- BaseStream (February 14, 2024)
- BiConsumer (July 1, 2023)
- BiFunction (July 1, 2023)
- BigDecimal (December 31, 2023)
- BigInteger (December 31, 2023)
- BiPredicate (July 1, 2023)
- BlockingDeque (July 5, 2023)
- BlockingQueue (July 20, 2023)
- Boolean (February 25, 2024)
- BooleanSupplier (May 15, 2024)
- BrokenBarrierException (April 2, 2025)
- Buffer (November 14, 2024)
- BufferedInputStream (July 27, 2024)
- BufferedOutputStream (July 27, 2024)
- BufferedReader (July 28, 2024)
- BufferedWriter (July 28, 2024)
- BufferOverflowException (April 23, 2025) New!
- BufferUnderflowException (April 16, 2025) New!
- Byte (February 25, 2024)
- ByteArrayInputStream (July 23, 2024)
- ByteArrayOutputStream (July 23, 2024)
- ByteBuffer (November 19, 2024)
- ByteChannel (August 17, 2023)
C
- Calendar (June 29, 2024)
- Callable (January 27, 2024)
- CancellationException (May 31, 2023)
- Channel (November 7, 2024)
- Character (October 3, 2024)
- CharacterData (XML) (September 4, 2024)
- CharBuffer (November 19, 2024)
- CharSequence (October 2, 2024)
- Charset (October 6, 2024)
- Checksum (March 19, 2025)
- ChoiceFormat (November 25, 2022)
- ChronoLocalDate (May 12, 2024)
- ChronoLocalDateTime (June 3, 2024)
- ChronoZonedDateTime (June 8, 2024)
- Class (July 8, 2023)
- ClassCastException (May 27, 2023)
- ClassNotFoundException (March 13, 2024)
- Cleaner (July 1, 2023)
- Cleaner.Cleanable (January 18, 2024)
- Clock (July 7, 2024)
- Cloneable (January 20, 2024)
- CloneNotSupportedException (June 10, 2023)
- Closeable (July 20, 2024)
- Collection (December 5, 2024)
- Collections (December 24, 2023)
- Collectors (July 1, 2023)
- Comment (XML) (September 7, 2024)
- CompactNumberFormat (November 27, 2022)
- Comparable (May 1, 2024)
- Comparator (May 2, 2024)
- ConcurrentHashMap (June 17, 2023)
- ConcurrentHashMap.KeySetView (June 12, 2023)
- ConcurrentLinkedDeque (June 23, 2023)
- ConcurrentLinkedQueue (June 21, 2023)
- ConcurrentMap (June 2, 2023)
- ConcurrentModificationException (May 27, 2023)
- ConcurrentSkipListMap (June 17, 2023)
- ConcurrentSkipListSet (June 17, 2023)
- Condition (May 16, 2023)
- Connection (JDBC) (August 2, 2024)
- ConsoleHandler (logging) (December 31, 2023)
- Constructor (reflection) (July 8, 2023)
- Consumer (May 29, 2024)
- CopyOnWriteArrayList (May 25, 2023)
- CopyOnWriteArraySet (June 17, 2023)
- CountDownLatch (October 12, 2022)
- CRC32 (March 25, 2025)
- CRC32C (March 25, 2025)
- Currency (December 1, 2022)
- CyclicBarrier (April 26, 2023)
D
- DataInput (July 24, 2024)
- DataInputStream (August 13, 2024)
- DataOutput (July 24, 2024)
- DataOutputStream (August 13, 2024)
- Date (June 29, 2024)
- DateTimeException (May 11, 2024)
- DateTimeParseException (July 18, 2024)
- DayOfWeek (May 8, 2024)
- DecimalFormat (November 30, 2022)
- Deflater (ZIP) (February 14, 2023)
- DeflaterInputStream (ZIP) (July 15, 2023)
- DeflaterOutputStream (ZIP) (July 20, 2023)
- Deque (January 22, 2025)
- DirectoryNotEmptyException (November 12, 2024)
- Document (XML) (September 7, 2024)
- DocumentBuilder (XML) (September 21, 2024)
- DocumentBuilderFactory (XML) (September 21, 2024)
- DOMImplementation (XML) (September 24, 2024)
- DOMImplementationLS (XML) (September 24, 2024)
- Double (December 31, 2023)
- DoubleBuffer (November 27, 2024)
- DoubleConsumer (March 19, 2024)
- DoubleFunction (February 19, 2024)
- DoublePredicate (May 6, 2024)
- DoubleStream (February 21, 2024)
- DoubleSupplier (June 12, 2024)
- Driver (JDBC) (August 22, 2024)
- DriverManager (JDBC) (August 22, 2024)
- Duration (June 1, 2024)
E
- Element (XML) (September 11, 2024)
- Entity (XML) (September 12, 2024)
- EntityReference (XML) (September 12, 2024)
- Enum (November 6, 2024)
- EnumMap (February 22, 2025)
- EnumSet (March 6, 2025)
- Era (July 11, 2024)
- Error (April 8, 2025)
- Exception (October 31, 2024)
- Exchanger (April 28, 2023)
- Executable (July 8, 2023)
- ExecutionException (December 30, 2024)
- Executor (December 24, 2023)
- Executors (December 24, 2023)
- ExecutorService (December 24, 2023)
F
- Field (reflection) (July 8, 2023)
- File (October 30, 2024)
- FileAlreadyExistsException (November 13, 2024)
- FileChannel (November 14, 2024)
- FileHandler (logging) (December 31, 2023)
- FileLock (October 30, 2024)
- Files (November 14, 2024)
- FileStore (Storage) (November 5, 2024)
- FileSystemException (November 6, 2024)
- FileVisitor (November 5, 2024)
- FilterInputStream (July 25, 2024)
- FilterOutputStream (July 25, 2024)
- FilterReader (August 18, 2024)
- FilterWriter (August 25, 2024)
- Float (March 9, 2024)
- FloatBuffer (November 27, 2024)
- Flow (Reactive Streams) (December 5, 2023)
- Flow.Processor (Reactive Streams) (December 15, 2023)
- Flow.Publisher (Reactive Streams) (April 14, 2024)
- Flow.Subscriber (Reactive Streams) (December 5, 2023)
- Flow.Subscription (Reactive Streams) (December 7, 2023)
- Flushable (July 30, 2024)
- Format (November 21, 2022)
- Formatter (logging) (December 31, 2023)
- Formatter (String Syntax) (October 3, 2024)
- Function (May 26, 2024)
- Future (December 24, 2023)
- Future.State (May 27, 2023)
- FutureTask (December 24, 2023)
G
- GatheringByteChannel (September 13, 2023)
- GZIPInputStream (ZIP) (July 15, 2023)
- GZIPOutputStream (ZIP) (July 15, 2023)
H
- Handler (logging) (December 24, 2023)
- HashMap (January 14, 2025)
- HashSet (January 18, 2025)
- HexFormat (July 8, 2023)
- HttpClient (March 31, 2024)
- HttpClient.Version (April 10, 2024)
- HttpHeaders (April 6, 2024)
- HttpRequest (April 4, 2024)
- HttpRequest.BodyPublisher (April 17, 2024)
- HttpRequest.BodyPublishers (April 18, 2024)
- HttpRequest.Builder (April 13, 2024)
- HttpResponse (April 4, 2024)

I
- IllegalAccessException (May 27, 2023)
- IllegalArgumentException (March 14, 2024)
- IllegalStateException (March 24, 2024)
- IndexOutOfBoundsException (March 27, 2024)
- Inflater (ZIP) (February 16, 2023)
- InflaterInputStream (ZIP) (July 15, 2023)
- InflaterOutputStream (ZIP) (July 15, 2023)
- InheritableThreadLocal (January 25, 2024)
- InputStream (July 20, 2024)
- InputStreamReader (August 10, 2024)
- Instant (May 5, 2024)
- InstantSource (July 7, 2024)
- IntBuffer (November 20, 2024)
- IntConsumer (February 27, 2024)
- Integer (December 31, 2023)
- InterruptedException (March 23, 2024)
- InterruptibleChannel (July 20, 2023)
- IntFunction (January 29, 2024)
- IntPredicate (March 25, 2024)
- IntStream (February 21, 2024)
- IntSupplier (June 12, 2024)
- IOException (October 31, 2024)
- IsoEra (July 13, 2024)
- Iterable (October 22, 2024)
- Iterator (December 26, 2024)
J
- JapaneseDate (July 18, 2024)
- JapaneseEra (July 13, 2024)
- JShell (April 1, 2023)
L
- Level (logging) (December 24, 2023)
- LinkedBlockingDeque (July 11, 2023)
- LinkedBlockingQueue (July 6, 2023)
- LinkedHashMap (February 4, 2025)
- LinkedHashSet (February 22, 2025)
- LinkedList (January 22, 2025)
- List (December 12, 2024)
- ListIterator (December 29, 2024)
- LocalDate (May 11, 2024)
- LocalDateTime (June 8, 2024)
- Locale (November 21, 2022)
- LocalTime (May 25, 2024)
- Lock (May 10, 2023)
- Logger (logging) (December 24, 2023)
- LogManager (logging) (December 31, 2023)
- Long (March 9, 2024)
- LongBuffer (November 27, 2024)
- LongConsumer (March 16, 2024)
- LongFunction (February 12, 2024)
- LongPredicate (April 2, 2024)
- LongStream (February 21, 2024)
- LongSupplier (June 18, 2024)
- LSSerializer (XML) (September 25, 2024)
M
- Map (December 5, 2024)
- Map.Entry (December 14, 2024)
- MappedByteBuffer (November 20, 2024)
- Matcher (regex) (October 15, 2024)
- MatchResult (regex) (October 15, 2024)
- Math (June 3, 2023)
- MathContext (December 31, 2023)
- Member (July 8, 2023)
- Method (reflection) (July 8, 2023)
- Month (July 6, 2024)
- MonthDay (July 8, 2024)
N
- NavigableMap (January 29, 2025)
- NavigableSet (February 13, 2025)
- Node (XML) (September 1, 2024)
- Normalizer (October 2, 2024)
- NoSuchElementException (February 8, 2024)
- NoSuchFieldException (May 27, 2023)
- NoSuchFileException (November 12, 2024)
- NoSuchMethodException (May 27, 2023)
- NullPointerException (March 14, 2024)
- Number (December 31, 2023)
- NumberFormat (November 27, 2022)
O
- Object (January 20, 2024)
- Objects (February 25, 2024)
- OffsetDateTime (July 17, 2024)
- OffsetTime (July 17, 2024)
- Optional (January 31, 2024)
- OptionalDouble (February 6, 2024)
- OptionalInt (January 31, 2024)
- OptionalLong (February 2, 2024)
- OutOfMemoryError (April 16, 2025) Update!
- OutputStream (July 20, 2024)
- OutputStreamWriter (August 10, 2024)
P
- Path (October 22, 2024)
- Pattern (regex) (October 15, 2024)
- PatternSyntaxException (regex) (October 27, 2024)
- Period (June 1, 2024)
- PhantomReference (July 1, 2023)
- PipedReader (August 27, 2024)
- PipedWriter (August 20, 2024)
- Predicate (January 7, 2024)
- PrintStream (July 30, 2024)
- PrintWriter (August 29, 2024)
- PriorityBlockingQueue (July 27, 2023)
- PriorityQueue (July 24, 2023)
- Process (March 26, 2023)
- ProcessBuilder (May 20, 2023)
- ProcessBuilder.Redirect (March 9, 2023)
- ProcessHandle (March 26, 2023)
- ProcessHandle.Info (March 28, 2023)
- PushbackReader (August 29, 2024)
Q
- Queue (December 14, 2024)
R
- Random (January 13, 2024)
- RandomAccess (March 4, 2025)
- RandomGenerator (January 7, 2024)
- Readable (August 17, 2024)
- ReadableByteChannel (August 11, 2023)
- Reader (July 21, 2024)
- ReadOnlyBufferException (April 30, 2025) New!
- ReentrantLock (June 28, 2023)
- Reference (March 9, 2024)
- ReflectiveOperationException (March 12, 2024)
- RoundingMode (December 31, 2023)
- Runnable (December 16, 2023)
- Runtime (February 24, 2023)
- RuntimeException (October 28, 2024)
S
- Scanner (July 22, 2023)
- ScatteringByteChannel (September 11, 2023)
- SeekableByteChannel (September 1, 2023)
- Semaphore (May 13, 2023)
- SequencedCollection (December 22, 2024)
- SequencedMap (January 26, 2025)
- SequencedSet (February 4, 2025)
- Serializable (December 14, 2022)
- Set (December 14, 2024)
- Short (March 9, 2024)
- ShortBuffer (November 27, 2024)
- SimpleFileVisitor (November 13, 2024)
- SimpleFormatter (logging) (December 31, 2023)
- SoftReference (July 1, 2023)
- SortedMap (January 29, 2025)
- SortedSet (February 8, 2025)
- Spliterator (February 19, 2025)
- SQLException (JDBC) (June 26, 2024)
- StackOverflowError (April 8, 2024)
- StackWalker (July 8, 2023)
- StandardCharsets (October 10, 2024)
- StandardCopyOption (File) (November 6, 2024)
- Stream (February 18, 2024)
- Stream.Builder (March 9, 2024)
- StreamHandler (logging) (December 31, 2023)
- StreamTokenizer (January 27, 2023)
- StrictMath (July 15, 2023)
- String (October 9, 2024)
- StringBuffer (October 8, 2024)
- StringBuilder (October 8, 2024)
- StringIndexOutOfBoundsException (April 23, 2024)
- StringJoiner (October 10, 2024)
- StringReader (August 13, 2024)
- StringWriter (August 13, 2024)
- SubmissionPublisher (Reactive Streams) (December 19, 2023)
- Supplier (May 23, 2024)
- System (April 28, 2024)
T
- Temporal (June 4, 2024)
- TemporalAccessor (May 12, 2024)
- TemporalAdjuster (July 16, 2024)
- TemporalAdjusters (July 13, 2024)
- Text (XML) (September 17, 2024)
- Thread (December 24, 2023)
- ThreadGroup (January 24, 2024)
- ThreadLocal (January 22, 2024)
- Throwable (October 23, 2024)
- TimeoutException (Thread) (April 9, 2025)
- TimeUnit (July 1, 2023)
- TimeZone (June 30, 2024)
- ToIntFunction (May 27, 2024)
- Transformer (XML) (September 25, 2024)
- TransformerFactory (XML) (September 25, 2024)
- TreeMap (January 26, 2025)
- TreeSet (February 13, 2025)
U
- UnsupportedOperationException (January 13, 2024)
- URI (April 20, 2024)
- URISyntaxException (April 29, 2024)
- URL (April 21, 2024)
- UUID (January 7, 2024)
W
- WeakHashMap (March 9, 2024)
- WeakReference (March 9, 2024)
- Wrapper (JDBC) (July 3, 2024)
- WritableByteChannel (August 14, 2023)
- Writer (July 21, 2024)
X
- XMLFormatter (logging) (December 31, 2023)
Y
- Year (July 6, 2024)
- YearMonth (July 18, 2024)
Z
- ZipEntry (February 20, 2023)
- ZipFile (February 22, 2023)
- ZipInputStream (July 15, 2023)
- ZipOutputStream (July 15, 2023)
- ZonedDateTime (June 15, 2024)
- ZoneId (June 9, 2024)
- ZoneOffset (June 16, 2024)

Programming TIPS!

Java TIPS

Category

Annotation

Base

Buffer

Channel

Checksum

Collection

Database(JDBC)

Design

Exception

File

Functional Interface

Internationalization

IO

Logging

Network

Number

Optional

Process

Random

Reactive Streams

Reference

Reflection

Regex

Stream

String

Thread

Time

Tool

Utility

XML

ZIP

Index