java - How to implement the abstract method in interface? -

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I am thinking how to implement an abstract method in an interface. Looking at this interface: 

  public interface analysis {public double getAverage (); }   
 In order to implement an abstract method, do I declare the method as intangible?  
  public abstract double getAverage (); ??   
 Or declare the interface as an abstract?  
  Public abstract interface analysis {public double getAverage (); }   
 Or need other things?  
 I have a class that implements the interface called  sign :  
  marks of public squares apply (some other code) Manufacturer mutator public double getAverage ();}   
 So, my main problem is how to implement the abstract method in the interface?   
 < Div class = "post-text" itemprop = "text"> 
 To create an intangible class implementing the interface:  
  Public abstract class AbstractAnalysis Applies analysis {public abstract double getAverage ();}   
 to create a solid square to implement the interface:  
  public class mine Analysis applies {public double getAverage () {// TODO}}   
 Or, it increases the intangible class to create a solid square and thus the interface is implemented:  
  Public class MyAnalysis offers AbstractAnalysis {public double getAverage () {// TODO}}

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