Java Callback using Interfaces

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//Step 1: Create an interface for callback method interface ClickEventHandler { public void handleClick(); } //Step 2: Create a callback handler //implementing the above interface class ClickHandler implements ClickEventHandler { public void handleClick() { System.out.println("Clicked"); } } //Step 3: Create event generator class class Button { public void onClick(ClickEventHandler clickHandler){ clickHandler.handleClick(); } } public class Tester { public static void main(String[] args) { Button button = new Button(); ClickHandler clickHandler = new ClickHandler(); //pass the clickHandler to do the default operation button.onClick(clickHandler); Button button1 = new Button(); //pass the interface to implement own operation button1.onClick(new ClickEventHandler() { @Override public void handleClick() { System.out.println("Button Clicked"); } }); } }

Java Callback using Interfaces (JDK 1.8.0)

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