edu.princeton.cs.algs4

Class Interval2D

java.lang.Object

edu.princeton.cs.algs4.Interval2D

public class Interval2D
extends java.lang.Object

The Interval2D class represents a closed two-dimensional interval, which represents all points (x, y) with both xmin <= x <= xmax and ymin <= y <= ymax. Two-dimensional intervals are immutable: their values cannot be changed after they are created. The class Interval2D includes methods for checking whether a two-dimensional interval contains a point and determining whether two two-dimensional intervals intersect.

For additional documentation, see Section 1.2 of Algorithms, 4th Edition by Robert Sedgewick and Kevin Wayne.

Constructor Summary

Constructors

Constructor and Description
Interval2D(Interval1D x, Interval1D y) Initializes a two-dimensional interval.

Method Summary

Modifier and Type	Method and Description
double	area() Returns the area of this two-dimensional interval.
boolean	contains(Point2D p) Does this two-dimensional interval contain the point p?
void	draw() Draws this two-dimensional interval to standard draw.
boolean	equals(java.lang.Object other) Does this interval equal the other interval?
int	hashCode() Returns an integer hash code for this interval.
boolean	intersects(Interval2D that) Does this two-dimensional interval intersect that two-dimensional interval?
static void	main(java.lang.String[] args) Unit tests the Interval2D data type.
java.lang.String	toString() Returns a string representation of this two-dimensional interval.

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Interval2D

public Interval2D(Interval1D x,
                  Interval1D y)

Initializes a two-dimensional interval.

Parameters:

x - the one-dimensional interval of x-coordinates

y - the one-dimensional interval of y-coordinates

Method Detail

intersects

public boolean intersects(Interval2D that)

Does this two-dimensional interval intersect that two-dimensional interval?

Parameters:

that - the other two-dimensional interval

Returns:

true if this two-dimensional interval intersects that two-dimensional interval; false otherwise

contains

public boolean contains(Point2D p)

Does this two-dimensional interval contain the point p?

Parameters:

p - the two-dimensional point

Returns:

true if this two-dimensional interval contains the point p; false otherwise

area

public double area()

Returns the area of this two-dimensional interval.

Returns:

the area of this two-dimensional interval

toString

public java.lang.String toString()

Returns a string representation of this two-dimensional interval.

Overrides:

toString in class java.lang.Object

Returns:

a string representation of this two-dimensional interval in the form [xmin, xmax] x [ymin, ymax]

equals

public boolean equals(java.lang.Object other)

Does this interval equal the other interval?

Overrides:

equals in class java.lang.Object

Parameters:

other - the other interval

Returns:

true if this interval equals the other interval; false otherwise

hashCode

public int hashCode()

Returns an integer hash code for this interval.

Overrides:

hashCode in class java.lang.Object

Returns:

an integer hash code for this interval

draw

public void draw()

Draws this two-dimensional interval to standard draw.

main

public static void main(java.lang.String[] args)

Unit tests the Interval2D data type.

Parameters:

args - the command-line arguments