How can I access my secondary interface method in my for loop?

I can't access my el.print() in my for loop. These are four different files. I have two interfaces with separate names. I can't combine them or add or remove and new methods. I can change current methods however. There are similar classes as to triangle for square, rectangle, etc. Circle cannot access Printable.print, the other three can.

Code java:

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public class InterfaceApp 
{
    public static void main( String[] args )
    {
        Rectangle myRectangle = new Rectangle( 6, 3 );
        Square mySquare = new Square( 5, 5 );
        Triangle myTriangle = new Triangle( 6 );
        Circle myCircle = new Circle( 5 );
 
        System.out.println( myRectangle );
        System.out.println();
        System.out.println( mySquare );
        System.out.println();
        System.out.println( myTriangle );
        System.out.println();
        System.out.printf( myCircle + "%nDiameter: %d%nCircumference: %.1f%n%n",
                myCircle.diameter(), myCircle.circumference() );
 
        System.out.printf( "Shape Array: %n-----------%n" );
 
        Shape[] myShapes = { mySquare, myRectangle, myTriangle, myCircle };
 
        mySquare.print();
        myRectangle.print();
        myTriangle.print();
 
        for ( Shape el : myShapes )
        {
 
            System.out.printf( el + "%nPerimeter: %.1f%nArea: %.1f%n", 
                    el.perimeter(), el.area() );
 
            if (!( el instanceof Circle ))
            {
                el.print();
            }
 
        }
    }
}
 
public class Triangle implements Shape, Printable
{
    private final int leg;
    private final double hypotenuse;
 
    public Triangle( int l )
    {
        leg = l;
        hypotenuse = leg*Math.sqrt( 2.0 );
    }    
 
    public int getLeg()
    {
        return leg;
    }
 
    public double getHypotenuse()
    {
        return hypotenuse;
    }
 
    @Override
    public String toString()
    {
        return String.format( "Triangle(%d)", leg );
    }
 
    @Override
    public double perimeter() 
    {
        return 2*leg + hypotenuse;
    }
 
    @Override
    public double area() 
    {
        return .5*(Math.pow( leg,  2 ));    
    }
 
    @Override
    public void print() 
    {
        String gap = "";
        System.out.println( "* " );
        for ( int i = 1; i < leg; i++ )
        {
 
            if ( i == leg - 1 )
            {
                for ( int j = 0; j < leg; j++ )
                {
                    if ( j == leg - 1 )
                    {
                        System.out.println( "* ");
                    }
                    else
                    {
                    System.out.printf( "* " );
                    }
                }
            }
            else
            {
                if ( i == 1 )
                {
                    gap = "";
                }
                else 
                {
                    gap += "  ";
                }
            System.out.println( "* " + gap + "* " );
            }
        }
    }
}
 
public interface Shape 
{
    double perimeter();
    double area();
}
 
public interface Printable 
{
    void print();
}

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It could be because im tired but i dont see where el is declared.

Quote:

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I can't access

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If there are error messages, copy the full text of the messages and paste it here.


The Shape interface does not have a print() method.
The Printable interface does have a print() method. Make el a Printable.

I just extended Shapes with Printable. Problem solved.