# Class Point2D

java.lang.Object
java.awt.geom.Point2D

All Implemented Interfaces:
  `Cloneable`

Direct Known Subclasses:
  `Point, Point2D.Double, Point2D.Float`

public abstract class Point2D extends Object implements Cloneable
The `Point2D` class defines a point representing a location in `(x,y)` coordinate space.

This class is only the abstract superclass for all objects that store a 2D coordinate. The actual storage representation of the coordinates is left to the subclass.

Since:
  1.2

- ## Nested Class Summary

  Nested Classes
  Modifier and Type
  Class
  Description
  `static class`
  `Point2D.Double`
  The `Double` class defines a point specified in `double` precision.
  `static class`
  `Point2D.Float`
  The `Float` class defines a point specified in float precision.

- ## Constructor Summary

  Constructors
  Modifier
  Constructor
  Description
  `protected`
  `Point2D()`
  This is an abstract class that cannot be instantiated directly.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `Object`
  `clone()`
  Creates a new object of the same class and with the same contents as this object.
  `double`
  `distance(double px, double py)`
  Returns the distance from this `Point2D` to a specified point.
  `static double`
  `distance(double x1, double y1, double x2, double y2)`
  Returns the distance between two points.
  `double`
  `distance(Point2D pt)`
  Returns the distance from this `Point2D` to a specified `Point2D`.
  `double`
  `distanceSq(double px, double py)`
  Returns the square of the distance from this `Point2D` to a specified point.
  `static double`
  `distanceSq(double x1, double y1, double x2, double y2)`
  Returns the square of the distance between two points.
  `double`
  `distanceSq(Point2D pt)`
  Returns the square of the distance from this `Point2D` to a specified `Point2D`.
  `boolean`
  `equals(Object obj)`
  Determines whether or not two points are equal.
  `abstract double`
  `getX()`
  Returns the X coordinate of this `Point2D` in `double` precision.
  `abstract double`
  `getY()`
  Returns the Y coordinate of this `Point2D` in `double` precision.
  `int`
  `hashCode()`
  Returns the hashcode for this `Point2D`.
  `abstract void`
  `setLocation(double x, double y)`
  Sets the location of this `Point2D` to the specified `double` coordinates.
  `void`
  `setLocation(Point2D p)`
  Sets the location of this `Point2D` to the same coordinates as the specified `Point2D` object.

  ### Methods declared in class Object

  `finalize, getClass, notify, notifyAll, toString, wait, wait, wait`

- ## Constructor Details

  - ### Point2D

    protected Point2D()
    This is an abstract class that cannot be instantiated directly. Type-specific implementation subclasses are available for instantiation and provide a number of formats for storing the information necessary to satisfy the various accessor methods below.
    Since:
      1.2
    See Also:
      - `Point2D.Float`
      - `Point2D.Double`
      - `Point`

- ## Method Details

  - ### getX

    public abstract double getX()
    Returns the X coordinate of this `Point2D` in `double` precision.
    Returns:
      the X coordinate of this `Point2D`.
    Since:
      1.2

  - ### getY

    public abstract double getY()
    Returns the Y coordinate of this `Point2D` in `double` precision.
    Returns:
      the Y coordinate of this `Point2D`.
    Since:
      1.2

  - ### setLocation

    public abstract void setLocation(double x, double y)
    Sets the location of this `Point2D` to the specified `double` coordinates.
    Parameters:
      `x` - the new X coordinate of this `Point2D`
      `y` - the new Y coordinate of this `Point2D`
    Since:
      1.2

  - ### setLocation

    public void setLocation(Point2D p)
    Sets the location of this `Point2D` to the same coordinates as the specified `Point2D` object.
    Parameters:
      `p` - the specified `Point2D` to which to set this `Point2D`
    Since:
      1.2

  - ### distanceSq

    public static double distanceSq(double x1, double y1, double x2, double y2)
    Returns the square of the distance between two points.
    Parameters:
      `x1` - the X coordinate of the first specified point
      `y1` - the Y coordinate of the first specified point
      `x2` - the X coordinate of the second specified point
      `y2` - the Y coordinate of the second specified point
    Returns:
      the square of the distance between the two sets of specified coordinates.
    Since:
      1.2

  - ### distance

    public static double distance(double x1, double y1, double x2, double y2)
    Returns the distance between two points.
    Parameters:
      `x1` - the X coordinate of the first specified point
      `y1` - the Y coordinate of the first specified point
      `x2` - the X coordinate of the second specified point
      `y2` - the Y coordinate of the second specified point
    Returns:
      the distance between the two sets of specified coordinates.
    Since:
      1.2

  - ### distanceSq

    public double distanceSq(double px, double py)
    Returns the square of the distance from this `Point2D` to a specified point.
    Parameters:
      `px` - the X coordinate of the specified point to be measured against this `Point2D`
      `py` - the Y coordinate of the specified point to be measured against this `Point2D`
    Returns:
      the square of the distance between this `Point2D` and the specified point.
    Since:
      1.2

  - ### distanceSq

    public double distanceSq(Point2D pt)
    Returns the square of the distance from this `Point2D` to a specified `Point2D`.
    Parameters:
      `pt` - the specified point to be measured against this `Point2D`
    Returns:
      the square of the distance between this `Point2D` to a specified `Point2D`.
    Since:
      1.2

  - ### distance

    public double distance(double px, double py)
    Returns the distance from this `Point2D` to a specified point.
    Parameters:
      `px` - the X coordinate of the specified point to be measured against this `Point2D`
      `py` - the Y coordinate of the specified point to be measured against this `Point2D`
    Returns:
      the distance between this `Point2D` and a specified point.
    Since:
      1.2

  - ### distance

    public double distance(Point2D pt)
    Returns the distance from this `Point2D` to a specified `Point2D`.
    Parameters:
      `pt` - the specified point to be measured against this `Point2D`
    Returns:
      the distance between this `Point2D` and the specified `Point2D`.
    Since:
      1.2

  - ### clone

    public Object clone()
    Creates a new object of the same class and with the same contents as this object.
    Overrides:
      `clone` in class `Object`
    Returns:
      a clone of this instance.
    Throws:
      `OutOfMemoryError` - if there is not enough memory.
    Since:
      1.2
    See Also:
      - `Cloneable`

  - ### hashCode

    public int hashCode()
    Returns the hashcode for this `Point2D`.
    Overrides:
      `hashCode` in class `Object`
    Returns:
      a hash code for this `Point2D`.
    See Also:
      - `Object.equals(java.lang.Object)`
      - `System.identityHashCode(Object)`

  - ### equals

    public boolean equals(Object obj)
    Determines whether or not two points are equal. Two instances of `Point2D` are equal if the values of their `x` and `y` member fields, representing their position in the coordinate space, are the same.
    Overrides:
      `equals` in class `Object`
    Parameters:
      `obj` - an object to be compared with this `Point2D`
    Returns:
      `true` if the object to be compared is an instance of `Point2D` and has the same values; `false` otherwise.
    Since:
      1.2
    See Also:
      - `Object.hashCode()`
      - `HashMap`