Java 8 Default Methods Tutorial


Default strategies empower you to add new usefulness to the interfaces of your libraries and guarantee parallel similarity with code composed for more established renditions of those interfaces.

Java 8 presents another idea of default strategy usage in interfaces. This ability is included for in reverse similarity with the goal that old interfaces can be utilized to use the lambda articulation capacity of Java 8.

Syntax

public interface vehicle { 

default void print() { 

System.out.println("I am a vehicle!"); 

} 

} 

Multiple Defaults

With default works in interfaces, there is a plausibility that a class is executing two interfaces with same default techniques. The accompanying code clarifies how this uncertainty can be settled.

public interface vehicle { 

default void print() { 

System.out.println("I am a vehicle!"); 

} 

} 

public interface fourWheeler { 

default void print() { 

System.out.println("I am a four wheeler!"); 

} 

}

First arrangement is to make a claim strategy that supersedes the default implementation.

public class vehicle implements vehicle, fourWheeler { 

public void print() { 

System.out.println("I am a four wheeler vehicle vehicle!"); 

} 

}

Second arrangement is to call the default strategy for the predetermined interface utilizing super.

Static Default Methods

An interface can likewise have static assistant strategies 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!!!"); 

} 

}





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