# Class Point2D

• `java.lang.Object`
• `java.awt.geom.Point2D`
Implemented Interfaces:
Cloneable
Known Direct Subclasses:
Point, Point2D.Double, Point2D.Float

`public abstract class Point2D`
`extends Object`
`implements Cloneable`

This class implements a generic point in 2D Cartesian space. The storage representation is left up to the subclass. Point includes two useful nested classes, for float and double storage respectively.
Since:
1.2

## Nested Class Summary

`static class`
`Point2D.Double`
This class defines a point in `double` precision.
`static class`
`Point2D.Float`
This class defines a point in `float` precision.

## Constructor Summary

`Point2D()`
The default constructor.

## Method Summary

` Object`
`clone()`
Create a new point of the same run-time type with the same contents as this one.
` double`
`distance(double x, double y)`
Return the distance from this point to the given one.
`static double`
`distance(double x1, double y1, double x2, double y2)`
Return the distance between two points.
` double`
`distance(Point2D p)`
Return the distance from this point to the given one.
` double`
`distanceSq(double x, double y)`
Return the square of the distance from this point to the given one.
`static double`
`distanceSq(double x1, double y1, double x2, double y2)`
Return the square of the distance between two points.
` double`
`distanceSq(Point2D p)`
Return the square of the distance from this point to the given one.
` boolean`
`equals(Object o)`
Compares two points for equality.
`abstract double`
`getX()`
Get the X coordinate, in double precision.
`abstract double`
`getY()`
Get the Y coordinate, in double precision.
` int`
`hashCode()`
Return the hashcode for this point.
`abstract void`
`setLocation(double x, double y)`
Set the location of this point to the new coordinates.
` void`
`setLocation(Point2D p)`
Set the location of this point to the new coordinates.

### Methods inherited from class java.lang.Object

`clone`, `equals`, `extends Object> getClass`, `finalize`, `hashCode`, `notify`, `notifyAll`, `toString`, `wait`, `wait`, `wait`

## Constructor Details

### Point2D

`protected Point2D()`
The default constructor.

## Method Details

### clone

`public Object clone()`
Create a new point of the same run-time type with the same contents as this one.
Overrides:
clone in interface Object
Returns:
the clone

### distance

```public double distance(double x,
double y)```
Return the distance from this point to the given one.
Parameters:
`x` - the x coordinate of the other point
`y` - the y coordinate of the other point
Returns:
the distance

### distance

```public static double distance(double x1,
double y1,
double x2,
double y2)```
Return the distance between two points.
Parameters:
`x1` - the x coordinate of point 1
`y1` - the y coordinate of point 1
`x2` - the x coordinate of point 2
`y2` - the y coordinate of point 2
Returns:
the distance from (x1,y1) to (x2,y2)

### distance

`public double distance(Point2D p)`
Return the distance from this point to the given one.
Parameters:
`p` - the other point
Returns:
the distance
Throws:
`NullPointerException` - if p is null

### distanceSq

```public double distanceSq(double x,
double y)```
Return the square of the distance from this point to the given one.
Parameters:
`x` - the x coordinate of the other point
`y` - the y coordinate of the other point
Returns:
the square of the distance

### distanceSq

```public static double distanceSq(double x1,
double y1,
double x2,
double y2)```
Return the square of the distance between two points.
Parameters:
`x1` - the x coordinate of point 1
`y1` - the y coordinate of point 1
`x2` - the x coordinate of point 2
`y2` - the y coordinate of point 2
Returns:
(x2 - x1)^2 + (y2 - y1)^2

### distanceSq

`public double distanceSq(Point2D p)`
Return the square of the distance from this point to the given one.
Parameters:
`p` - the other point
Returns:
the square of the distance
Throws:
`NullPointerException` - if p is null

### equals

`public boolean equals(Object o)`
Compares two points for equality. This returns true if they have the same coordinates.
Overrides:
equals in interface Object
Parameters:
`o` - the point to compare
Returns:
true if it is equal

### getX

`public abstract double getX()`
Get the X coordinate, in double precision.
Returns:
the x coordinate

### getY

`public abstract double getY()`
Get the Y coordinate, in double precision.
Returns:
the y coordinate

### hashCode

`public int hashCode()`
Return the hashcode for this point. The formula is not documented, but appears to be the same as:
``` long l = Double.doubleToLongBits(getY());
l = l * 31 ^ Double.doubleToLongBits(getX());
return (int) ((l >> 32) ^ l);
```
Overrides:
hashCode in interface Object
Returns:
the hashcode

### setLocation

```public abstract void setLocation(double x,
double y)```
Set the location of this point to the new coordinates. There may be a loss of precision.
Parameters:
`x` - the new x coordinate
`y` - the new y coordinate

### setLocation

`public void setLocation(Point2D p)`
Set the location of this point to the new coordinates. There may be a loss of precision.
Parameters:
`p` - the point to copy
Throws:
`NullPointerException` - if p is null

Point2D.java -- generic point in 2-D space Copyright (C) 1999, 2000, 2002, 2004, 2006, Free Software Foundation This file is part of GNU Classpath. GNU Classpath is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GNU Classpath is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU Classpath; see the file COPYING. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version.