Raouf25

public class City {

    private String name;
    private String code;

    public City() {
    }

    public City(String name, String code) {
        this.name = name;

Raouf25

// Use a constructor with parameters to create a City
City sf = new City("San Francisco", "SF");
     
// Use a default constructor with no parameters to create a City
City la = new City();
// Set the members using setters
la.setName("Los Angeles");
la.setCode("LA");

Raouf25

// Use the City's method references and assign them to functions
Function<City, String> getNameFunction = City::getName;
Function<City, String> getCodeFunction = City::getCode;

System.out.println("The code for "
        + getNameFunction.apply(sf)
        + " is "
        + getCodeFunction.apply(sf));

Raouf25

// Use the City's method references and assign them to biconsumers
BiConsumer<City, String> setNameBiConsumer = City::setName;
BiConsumer<City, String> setCodeBiConsumer = City::setCode;
     
City ny = new City();
setNameBiConsumer.accept(ny, "New York");
setCodeBiConsumer.accept(ny, "NY");

Raouf25

// Use the City's constructor method reference to create
// a default constructor reference.
Supplier<City> defaultConstructor = City::new;
City sd = defaultConstructor.get();
sd.setName("San Diego");
sd.setCode("SD");

Raouf25

// Use the City's constructor method reference to create
// a two-parameter constructor reference.
BiFunction<String, String, City> twoParameterConstructor = City::new;
City dc = twoParameterConstructor.apply("Washington, D.C.", "DC");

Raouf25

function	function signature	call
Getters	Function<City, String> fun = City::getName;	fun.apply();
Setters	BiConsumer<City, String> fun = City::setName;	fun.accept();
Default Constructor	Supplier< City> fun = City::new;	fun.get();
Parameter Constructors	BiFunction fun =City::new;	fun.apply();

Raouf25

 for (final MultipartFile file : files) {
            try {
                carService.saveCars(file.getInputStream());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

Raouf25

files.stream()
   .parallel()
   .map(file-> {
       try {
           return file.getInputStream();
       } catch (IOException e) {
           e.printStackTrace();
           return null;
       }
   })

Raouf25

files.stream()
      .parallel()
      .map(file-> extractInputStream(file))
      .forEach(inputStream -> carService.saveCars(inputStream));