How To Implement Interface And Extend Class

how to 'implement' an interface and 'extend' a class. Now I want to try and recall the information by memory without using any reference material.
Implementing an interface...

Java Code: //This interface will hold information for cell phones//Like saying... you can't BE a cell phone unless you have this information, at the very least

public interface CellInfo {
public void model();
public void make();
public void androidVer();

}

//Now I implement the interface for a class called Galaxy, which is a class about a specific phone

public class Galaxy implements CellInfo
public void model() {
System.out.println("I'm a Galaxy S5.");
}

public void make() {
System.out.println("I'm made by Samsung.");

[code]....