Creating and importing packages in java

Question

One package contains an interface and another package must implement that interface, can anyone tell me the way to import,(because simply import does not work)

Answer 1

package Quad2;
import java.util.*;
import Quard1.*;
class Quadratic_equation implements Quard1.Quadratic_Eq{
public static void roots(){
System.out.println("Enter the a,b,c of ax^2+bx+c :");
Scanner scan = new Scanner(System.in);
double x[]=new double[3];
for(int i=2;i>=0;i--)
{
System.out.print("x^"+i+":");
x[i]=scan.nextDouble();
}
if(Math.pow(x[1],2.0)-(4*x[2]*x[0])>=0){
double root1 = (0-x[1]+Math.sqrt(Math.pow(x[1],2.0)-(4*x[2]*x[0])))/(2*x[2]);
double root2 = (0-x[1]-Math.sqrt(Math.pow(x[1],2.0)-(4*x[2]*x[0])))/(2*x[2]);
System.out.println("Root1: "+root1+"\nRoot2: "+root2);}
else{
double real,imag;
real=(0-x[1])/(2*x[2]);
imag=Math.sqrt(Math.abs(Math.pow(x[1],2.0)-(4*x[2]*x[0])))/(2*x[2]);
System.out.println("Root1: "+real+"+i"+imag+"\nRoot2:"+real+"-i"+imag);
}
}
public static void main(String args[]){
    Quadratic_equation Q = new Quadratic_equation();
    Q.roots();
}
}

Answer 2

package Quad1;
interface Quadratic_Eq{
public static void roots(){
}
}

Answer 3

This is the code

Answer 4

If anyone figures out an error please do tell me