Method References with :: - Java Lambda Stream

Java examples for Lambda Stream:Method Reference

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Description

Method References with ::

Demo Code


public class MethodReferencesMain {
  public static void main(String[] args) {
    // When a Lambda expression is invoking already defined method, you can
    // replace it with reference to that method.

    // Results results = () -> MethodRefOperations.show();
    Results results = MethodRefOperations::show;
    results.doOperation();//  w w  w. jav a  2s .  c o m
    results = MethodRefOperations::disp;
    results.doOperation();
    results = new MethodRefOperations()::display;
    results.doOperation();
  }

  interface Results {
    void doOperation();
  }
}

class MethodRefOperations {
  public static void show() {
    System.out.println("show() method is called");
  };

  public static void disp() {
    System.out.println("disp() method is called");
  };

  public void display() {
    System.out.println("display() method is called");
  }
}

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