net.algart.model3d.common.movement.model
Class Earth

java.lang.Object
  net.algart.model3d.common.movement.model.Earth

All Implemented Interfaces:

Item

public final class Earth
extends java.lang.Object
implements Item

Earth planet: an item which acts to any other item, which have a mass, by EarthGravitationRule interaction. It is supposed that Earth attracts any item with the force, directed downward and equal to F=(0,0,−mg), where g is the parameter of this object: acceleration of gravity.

This class is not thread-safe, but is thread-compatible and can be synchronized manually if multithread access is necessary.

AlgART Laboratory 2010

Since:

JDK 1.5

Version:

1.0

Author:

Daniel Alievsky

Earth

public Earth(double gravity)

Creates new Earth with the specified acceleration of gravity g=gravity.

Parameters:

gravity - acceleration of gravity g.

getGravity

public double getGravity()

Returns the acceleration of gravity g.

Returns:

the acceleration of gravity g.

setGravity

public void setGravity(double gravity)

Sets the acceleration of gravity g.

Parameters:

gravity - new acceleration of gravity g.

toString

public java.lang.String toString()

Returns a brief string description of this object.

The result of this method may depend on implementation.

Overrides:

toString in class java.lang.Object

Returns:

a brief string description of this object.