Java 14. Interface

interface

---

 The term "Interface" indicates a common set of methods, which may interact with an object by the set of methods.

java Interface (interface) is a set of constants and abstract methods set. Abstract no physical method is a method, and abstract method comprises not only the code after the parameter list of a method The header is followed by only a semicolon. Interfaces can not be instantiated.

Complexity interface consists of the following two abstract methods: setComplexity and getComplexity

public interface Complexity
        {
         public viod setComplexity(int complexity);
         public int getComplexity();
       }
        

 

 

public  interface Complexity { 

    public  static  void main (String [] args) 
       { 
        Final  a float the PI = 3.14159f; // define a constant ratio of the circumference representing the PI   
            a float getArea ( a float R & lt); // define a method for calculating the area getArea ()   
         a float getCircumference ( a float R & lt); // define a method for calculating the perimeter getCircumference ()   
     
    } 
} 



public  class   Question the implements Complexity { 

    Private String Question, answer;
     public  a float the getArea ( a float R & lt)   
          {   
              A float Area = the PI * R & lt * R & lt; // calculated and assigned to the variable circular area Area   
              return Area; // round returns the calculated area after   
          }  
           public  a float the getCircumference ( a float R & lt)    
          {   
             a float Circumference the PI * = 2 * R & lt;       / / calculated and assigned to the variable circumference circumference   
             return circumference;            // circumference of the return calculation   
         }  
          public  static  void main (String [] args)    
         {   
             Question C = new new Question ();  
             a float f = c.getArea(2.0f);  
             System.out.println(Float.toString(f));  
         }  
     }