Java java.awt.geom Class Point2D（JDK8）

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Java™ Platform
Standard Ed. 8

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

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method and 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 inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - 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 Detail
  - 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(java.lang.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

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Java™ Platform
Standard Ed. 8

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Summary:
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Field |
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Detail:
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Java java.awt.geom Class Point2D（JDK8）

Class Point2D

Nested Class Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

Point2D

Method Detail

getX

getY

setLocation

setLocation

distanceSq

distance

distanceSq

distanceSq

distance

distance

clone

hashCode

equals