Method References to Instance Methods

Java-Method References to Instance Methods

Method References to Instance Methods

To pass a reference to an instance method on a specific object, use the syntax: objRefName::methodName. This syntax is similar to that used for a static method, except that an object reference is used instead of a class name. The following program demonstrates a static method reference. In the program, notice that myOldMobile( ) and myNewMobile( ) are instance methods of MyMobile. Inside main( ), an instance of MyMobile called ‘my’ is created. This instance is used to create the method reference to myOldMobile( ) and myNewMobile( ) in the call to ‘my’.

Program

Method References to Instance Methods

Program Source

interface Mobile {

    String myMobile();
}
class MyMobile {
    
    String myOldMobile() {

        return "Old : Samsung Galaxy S6";
    }
    String myNewMobile() {

        return "New : Samsung Galaxy S9";
    }
}
class Javaapp {

    static void showMyMobile(Mobile mo) {
        
        System.out.println(mo.myMobile());
    }
    public static void main(String[] args) {
        
        MyMobile my = new MyMobile();

        showMyMobile(my::myOldMobile);
        showMyMobile(my::myNewMobile);
    }
}

Leave a Comment