degree/java_in_examples

Source example for java

This is collection of java code examples, best practice and useful article and link for Java

Java code examples and best practice

You can find following code examples:

• I. Compare collections in Apache, Guava, Gs Collection and JDK analog

  • 1. BiMap collection
  • 2. MultiMap collection
  • 3. Multiset collection

• II. Compare operations with collections in Apache, Guava, Gs Collection and JDK

  • 1. Operations for comparison collections (containsAll, containsAny, intersect, difference, symmetric difference, union)
  • 2. Operations for searching in collections (count, getFirst, getLast, getSingle, getMax, getMin, binarySearch, search, getByIndex, select)
  • 3. Create collections (ArrayList, HashSet, HashMap)
  • 4. Transform collections (sort, remove, retain, transform, changeAll)

• III. Examples of Stream API

• IV. Examples of Dependency injections in Dagger, Spring and Guice

• V. Examples of Natural Language Processing using OpenNLP, Stanford NLP amd so on

• VI. Examples of integration and html parsing

• VII. Examples of operation with String and Stream

• VII. Examples of operation with Array

Java Collections and Stream Api in Article

• I. Stream API
• 1. All way to create Stream in Java 8

I. Stream API

1. All way to create Stream in Java 8

Way to create stream	Template	Example

1. Classic: Create stream from collection | collection.stream() | Collection collection = Arrays.asList("a1", "a2", "a3");
   Stream streamFromCollection = collection.stream();
2. Create stream from values | Stream.of(value1,… ,valueN) | Stream streamFromValues = Stream.of("a1", "a2", "a3");
3. Create stream from array | Arrays.stream(array) | String[] array = {"a1","a2","a3"};
   Stream streamFromArrays = Arrays.stream(array);
4. Create stream from part of array | Arrays.stream(array, start, end) | String[] array = {"a1","a2","a3"};
   Stream streamFromArrays = Arrays.stream(array, 1, 2);
5. Create stream from file (every row from file become element of stream) | Files.lines(file_path) | Stream streamFromFiles = Files.lines(Paths.get("file.txt"));
6. Create stream from stirng (every char become element of stream) | "string".chars() | IntStream streamFromString = "123".chars();
7. Using Stream.builder | Stream.builder().add(...)....build() | Stream.builder().add("a1").add("a2").add("a3").build();
8. Create parallel stream from collection | collection.parallelStream() | Stream stream = collection.parallelStream();
9. Create infinive strean using Stream.iterate | Stream.iterate(init_value, generate_expression) | Stream streamFromIterate = Stream.iterate(1, n -> n + 1);
10. Create infinive strean using Stream.generate | Stream.generate(generate_expression) | Stream streamFromGenerate = Stream.generate(() -> "a1");
11. Create stream from path | Files.list(file_path) | Stream streamFromPath = Files.list(Paths.get(""));
12. Create stream from finding files | Files.find(file_path, max_depth, mathcher) | Stream streamFromFind = Files.find(Paths.get(""), 10, (p,a) -> true);
13. Create stream from files tree | Files.walk(file_path) | Stream streamFromFileTree = Files.walk(Paths.get(""));
14. Create stream from all entities of jar file | new JarFile(jar_file).stream() | …
15. Create stream from all entities of zip file | new ZipFile(zip_file).stream() | …
16. Create stream from iterator | StreamSupport.stream(Spliterators.spliteratorUnknownSize(iterator, 0), false) | ...
17. Create stream from iterable | StreamSupport.stream(iterable.spliterator(), false) | …
18. Create infinive stream from iterator | Stream.generate(iterator::next) | …
19. Create empty stream | Stream.empty() | Stream streamEmpty = Stream.empty();
20. Create stream from Pattern | Pattern.compile(reg_exp).splitAsStream(string) | Stream streamFromPattern = Pattern.compile(":").splitAsStream("a1:a2:a3");
21. Create stream from BufferedReader | bufferedReader.lines() | Stream streamFromBufferedReader = bufferedReader.lines();
22. Create stream from Enum | EnumSet.allOf(MyEnum.class).stream() | Stream streamFromEnum = EnumSet.allOf(MyEnum.class).stream();

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