Question

20. Assume you have a Java Interface with a method has this signature:

public double min(double... grades);

Write the implementation of this method so that it returns the smallest of the grades. Show example on calling the method when you are done with the implementation.

Answer 1

/*
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 * and open the template in the editor.
 */
package settest;

import java.util.Scanner;

/**
 *
 * @author pihu
 */

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package settest;

/**
 *
 * @author pihu
 */
public interface min_interface {
    public double min(double[] grades);
}





public class ImplInterface implements min_interface {
    public double min(double[] grades)
    {
        double min;
        min=grades[0];
        for(int i=1;i<grades.length;i++)
        {
            if(min>grades[i])
            {
                min=grades[i];
            }
        }
        return min;
    }
    public static void main(String args[])
    {
        System.out.println("Enter no of grades");
        ImplInterface impInterface=new ImplInterface();
        Scanner input=new Scanner(System.in);        
        int count=input.nextInt();
        double grade[]=new double[count];
        for(int i=0;i<count;i++)
        {
            System.out.println("Enter grade"+(i+1));
            double element=input.nextDouble();
            grade[i]=element;
        }
        System.out.println("Smallest Grades is "+impInterface.min(grade));
        
        
    }
}