Can some one point me to Java code ( in Java not C or C++) that calculates all the normals for all the vertices of a mesh for OpenGL ES application. I need this for lighting. Lets say I have a cube with following vertices and indices:

float vertices[] = { -width, -height, -depth, // 0
                              width, -height, -depth, // 1
                              width,  height, -depth, // 2

                             -width,  height, -depth, // 3

                             -width, -height,  depth, // 4


                              width, -height,  depth, // 5

                              width,  height,  depth, // 6

                             -width,  height,  depth // 7
        };  
       short indices[] = { 0, 2, 1,
                0, 3, 2,

                1,2,6,
                6,5,1,

                4,5,6,
                6,7,4,

                2,3,6,
                6,3,7,

                0,7,3,
                0,4,7,

                0,1,5,
                0,5,4


               };

In above specific example how many normals we need ?