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Why can't we define a static method in a Java interface?
From Java 8 onwards, static methods are allowed in Java interfaces.
An interface can also have static helper methods from Java 8 onwards.
public interface vehicle { default void print() { System.out.println("I am a vehicle!"); } static void blowHorn() { System.out.println("Blowing horn!!!"); } }
Default Method Example
Create the following Java program using any editor of your choice in, say, C:\> JAVA.
Java8Tester.java
public class Java8Tester { public static void main(String args[]) { Vehicle vehicle = new Car(); vehicle.print(); } } interface Vehicle { default void print() { System.out.println("I am a vehicle!"); } static void blowHorn() { System.out.println("Blowing horn!!!"); } } interface FourWheeler { default void print() { System.out.println("I am a four wheeler!"); } } class Car implements Vehicle, FourWheeler { public void print() { Vehicle.super.print(); FourWheeler.super.print(); Vehicle.blowHorn(); System.out.println("I am a car!"); } }
Verify the Result
Compile the class using javac compiler as follows −
C:\JAVA>javac Java8Tester.java
Now run the Java8Tester as follows −
C:\JAVA>java Java8Tester
Output
It should produce the following output −
I am a vehicle! I am a four wheeler! Blowing horn!!! I am a car!
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