Java8 new Feature-method reference

Method Reference: If the function in the LAMBDA body, there is already a method to provide the implementation, you can use the method reference
        (You can interpret a method reference as a different representation of a LAMBDA expression)

1. Reference to Object:: Instance method name
2. Class Name:: Static method Name
3. Class Name:: Instance method name

Attention:
    The ① method references the parameter list of the referenced method and the return value type, which needs to be consistent with the parameter list and return value type of the abstract method in the function interface!
    ② if the first parameter of the lambda parameter list is the caller of the instance method, the second argument (or no argument) is the argument of the instance method when the format is: Classname::methodname

Second, constructor reference: constructor parameter list, need to be consistent with the parameter list in the function interface!
1. Class Name:: New
Three, array reference
   Type []:: New;

Array reference

   /**      * Array Reference      */     @Testpublicvoid  test01 () {        FunctionNew  string[a];         = function.apply (9);        System.out.println (strings.length);        System.out.println ("equal to");        Function<integer, string[]> function1 = string[]::new;         = function1.apply (9);        System.out.println (strings1.length);    }

Object reference:: Instance method name

/**      * Object reference:     : Instance method name */    @Test    publicvoid  test02 () {        = System.out;        Consumer<String> Consumer = (a) ps.println (a);        Consumer.accept ("aaaaaaa");        System.out.println ("equal to");        Consumer<String> consumer1 = PS::p rintln;        Consumer1.accept ("GHHASDFH");    }

Object reference:: Instance method name

    /**      * Object reference:: Instance     method name */    @Test    publicvoid  test03 () {        new Employee (101, "Zhang San", 9999.99);        Supplier<String> sup = () emp.getname ();        System.out.println (Sup.get ());        System.out.println ("----------------------------------");        Supplier<String> sup2 = emp::getname;        System.out.println (Sup2.get ());    }

Class Name:: Static method Name

// class Name:: Static method Name     @Test    publicvoid  test4 () {        Comparator<Integer> com = (x, y)- > integer.compare (x, y);        System.out.println ("-------------------------------------");        Comparator<Integer> com2 = integer::compare;    }

Class Name:: Instance method name

  //class Name:: Instance method name@Test Public voidTest5 () {bipredicate<string, string> bp = (x, y)x.equals (y); System.out.println (Bp.test ("ABCDE", "ABCDE")); System.out.println ("-----------------------------------------"); Bipredicate<string, string> bp2 =string::equals; System.out.println (Bp2.test ("ABC", "ABC")); System.out.println ("-----------------------------------------"); Function<employee, string> fun = (e)e.show (); System.out.println (Fun.apply (NewEmployee ())); System.out.println ("-----------------------------------------"); Function<employee, string> fun2 =employee::show; System.out.println (Fun2.apply (NewEmployee ())); }

Constructor reference

 Public void test7 () {        Function<string, employee> fun = Employee::new;        Bifunction<string, Integer, employee> fun2 = Employee::new;    }

Java8 New Attribute-method reference