Using 3D designs in java

I am currently trying to practice 3D program designs in java, but unfortunately when I try to import the following packages, it gives says that the package does not exist.

import com.sun.j3d.utils.geometry.ColorCube;

import javax.media.j3d.BranchGroup;

import com.sun.j3d.utils.universe.SimpleUniverse;

Could anyon开发者_如何学编程e help me to resolve this problem?

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The 3D API is not part of the standard API. You'll need to download and install it before using classes from it in your code.

See: http://java.sun.com/javase/technologies/desktop/java3d/index.jsp