Translate ADT into a Java interface Example 2

Problem:

Translate this ADT into a Java interface:
ADT: Line
contains(Point): Boolean
equals(Line): Boolean
isHorizontal(): Boolean
isVertical(): Boolean
slope(): Real
toString(): String
xIntercept(): Real
yIntercept(): Real

Output:

None.

Solution:

public interface Line {
 public boolean contains(Point point);
 public boolean equals(Object object);
 public boolean isHorizontal();
 public boolean isVertical();
 public double slope();
 public String toString();
 public double xIntercept();
 public double yIntercept();
}