COMPLETE PROGRAM Implement class AltDistance that implements interface Distance using one variable feet

// This interface represents linear distance
public interface Distance 
{
public int getFeet();
public int getYards();
public int getMiles(); 
public Distance add(Distance other); 
public String toString();
}

Exercise 1: Implement class AltDistance that implements interface Distance using one variable feet. 
Exercise 2: Implement class AltDistance that implements interface Distance using three variables feet, yards, and miles. 
Exercise 3: Which methods were easier to implement in the one-variable representation? Which methods were easier to implement in the three-variable representation?
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