toandv

public static void main(String[] args) throws JsonProcessingException {
    ObjectMapper objectMapper = new ObjectMapper();
    objectMapper.registerModule(new JavaTimeModule());
    System.out.println(objectMapper.writeValueAsString(new Entity()));
}

static class Entity {
    ZonedDateTime time = ZonedDateTime.now();

    @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd'T'HH:mm:ss.SSSZ")

toandv

require 'set'
#h = Hash.new { |hash, key| hash[key] =  [] }
h = Hash.new { |hash, key| hash[key] =  Set.new }
h[:key] << "value 1"
h[:key] << "value 2"
h[:key2] << 1
puts h
puts h[:key].class.name

toandv

a = [1, 2, 3, 4]

puts a.inject(:+)

puts a.inject{|sum, x|  sum + x}

b = ["1", "2"]

c = b.map { |e| e.to_i }

toandv

sum = -> (a, b) {puts a + b}

sum.call(1 , 2)

def block1
	lambda { return 100}.call
	return :lambda
end

def block2 

toandv

book_params = {price: 100, isbn: 100}

puts book_params.class.name

puts p.inspect

class Book
	def initialize(book_params)
		if (book_params.instance_of? Hash)
			book_params.each do |k, v|

toandv

# force ending lines  LF
* text eol=lf

toandv

import java.util.Arrays;
import java.util.Comparator;
import java.util.List;

public class Comparings {
    public static void main(String[] args) {
        List<User> list = Arrays.asList(new User("a"), new User("b"), new User(""), new User(null));
        //
        //        list.sort((l, r) -> Comparator.nullsFirst(Comparator.nullsFirst(Comparator.naturalOrder())).compare(l.name,
        //                r.name));

toandv

public class RandomPasswordGenerator {

    private RandomPasswordGenerator() {
    }

    private static final char[] LOWERCASES = createCharArray('a', 'z');
    private static final char[] UPPERCASES = createCharArray('A', 'Z');
    private static final char[] DIGITS = createCharArray('0', '9');
    private static final SecureRandom RANDOM = new SecureRandom();

toandv

    private static final ObjectMapper objectMapper = new ObjectMapper()
            .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
            .configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false).setSerializationInclusion(Include.NON_NULL)
            .configure(SerializationFeature.WRITE_NULL_MAP_VALUES, false);

    static {
        objectMapper.getSerializerProvider().setNullKeySerializer(new NullKeySeriliazer());
        objectMapper.setVisibility(objectMapper.getSerializationConfig().getDefaultVisibilityChecker()
                .withFieldVisibility(JsonAutoDetect.Visibility.ANY).withGetterVisibility(JsonAutoDetect.Visibility.NONE)
                .withSetterVisibility(JsonAutoDetect.Visibility.NONE)

toandv

scp -r user@your.server.example.com:/path/to/foo /home/user/Desktop/
scp -i xxx-dev.pem ec2-user@dev.xxx.com:/var/log/xxx/xxx-user.log /home/toan/xxx-user.log