Interface looks like a class but it is not a class. An interface can have methods and variables just like the class but the methods declared in interface are by default abstract (only method signatures, no body, see: Java abstract method). A class can extend the features of other classes by use of inheritance. When a class extending more than one class is known as multiple inheritance. But Java doesn’t allow it because it creates the diamond problem and too complex to manage. We can achieve the multiple inheritances by use of interface.
//How Multiple inheritance can be achieved by implement multiple interfaces class Phone { void voiceCall() { System.out.println("Make VoiceClass"); } void sms() { System.out.println("We Can send SMS"); } } interface Camera { void click(); void record(); } interface player { void play(); void pause(); void stop(); } class SmartPhone extends Phone implements Camera,player { @Override public void click() { System.out.println("Take a Selfi"); } @Override public void record() { System.out.println("Take a video"); } @Override public void play() { System.out.println("Play Music"); } @Override public void pause() { System.out.println("Pause Music"); } @Override public void stop() { System.out.println("Stop Music"); } } public class interfaceDemo2 { public static void main(String[] args) { SmartPhone o =new SmartPhone(); o.voiceCall(); o.sms(); o.click(); o.record(); o.play(); o.pause(); o.stop(); } }
Make VoiceClass We Can send SMS Take a Selfi Take a video Play Music Pause Music Stop MusicTo download raw file Click Here
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