hello,

processing produces a java-file afaik.
Just use export application from the file menu.
Result see below.

that might help you:
http://www.processing.org/learning/eclipse/

you can conclude from there the steps to do a java program in an editor and compile it
using javac on the command-line and then java to run it. 

see
http://docs.oracle.com/javase/tutorial/getStarted/cupojava/win32.html

Greetings, Chrisir    



P.S.

this is JAVA, not processing code

1. import processing.core.*;
2. import processing.data.*;
3. import processing.event.*;
4. import processing.opengl.*;
5. import java.util.HashMap;
6. import java.util.ArrayList;
7. import java.io.BufferedReader;
8. import java.io.PrintWriter;
9. import java.io.InputStream;
10. import java.io.OutputStream;
11. import java.io.IOException;
12. public class Empty3Da extends PApplet {
13. float CameraX;
14. float CameraY;
15. public void setup()
16. {
17.   size( 800, 800, P3D );
18.   CameraX = width / 2.0f;
19.   CameraY = 50;
20.   noCursor();
21. } // setup
22. public void draw()
23. {
24.   background(0);
25.   stroke(111, 110, 110);
26.   fill(111, 110, 110);
27.   // ==================================================
28.   // draw floor
29.   float floorY=600;
30.   line ( 20, floorY, -200,
31.   width-20, floorY, -200);
32.   line ( 20, floorY, -20,
33.   width-20, floorY, -20);
34.   line ( 20, floorY, -200,
35.   20, floorY, -20);
36.   line ( width-20, floorY, -200,
37.   width-20, floorY, -20);
38.   // ==================================================
39.   //float floorY=600;
40.   line ( 20, floorY, -300,
41.   width-20, floorY, -300);
42.   line ( 20, floorY, -20,
43.   width-20, floorY, -20);
44.   line ( 20, floorY, -300,
45.   20, floorY, -20);
46.   line ( width-20, floorY, -300,
47.   width-20, floorY, -20);
48.   // ================================================== 
49.   // camera
50.   camera(
51.   CameraX, CameraY, 700,
52.   width/2.0f, height/2.0f, 0,
53.   0, 1, 0);
54.   // ==================================================
55.   // paint boxes
56.   //MyBox ( 310, 20, 22, 530, 210, 3, 14, color (255, 0, 0));
57.   //MyBox ( 110, 440, 44, 52, 10, 222, 14, color (2, 0, 255));
58.   MyBox ( mouseX, 590, map (mouseY, 0, height, -610, 110),
59.   mouseX, 596, map (mouseY, 0, height, -610, 110),
60.   14, color (2, 0, 255));
61. } // draw
62. public void keyPressed() {
63.   if (key == CODED) {
64.     if (keyCode == UP) {
65.       CameraY-=10;
66.     }
67.     else if (keyCode == DOWN) {
68.       CameraY+=10;
69.     }
70.     else if (keyCode == RIGHT) {
71.       CameraX+=10;
72.     }
73.     else if (keyCode == LEFT) {
74.       CameraX-=10;
75.     }
76.     else {
77.       // nothing
78.     }
79.   }
80.   else { 
81.     // not key == CODED
82.     //
83.   }
84. }
85. public void MyBox(float x1, float y1, float z1, float x2, float y2, float z2, float weight, int strokeColour)
86. // was called drawLine; programmed by James Carruthers
87. // see http://processing.org/discourse/yabb2/YaBB.pl?num=1262458611/0#9
88. {
89.   PVector p1 = new PVector(x1, y1, z1);
90.   PVector p2 = new PVector(x2, y2, z2);
91.   PVector v1 = new PVector(x2-x1, y2-y1, z2-z1);
92.   float rho = sqrt(pow(v1.x, 2)+pow(v1.y, 2)+pow(v1.z, 2));
93.   float phi = acos(v1.z/rho);
94.   float the = atan2(v1.y, v1.x);
95.   v1.mult(0.5f);
96.   pushMatrix();
97.   translate(x1, y1, z1);
98.   translate(v1.x, v1.y, v1.z);
99.   rotateZ(the);
100.   rotateY(phi);
101.   noStroke();
102.   fill(strokeColour);
103.   box(weight, weight, p1.dist(p2)*1.2f);
104.   popMatrix();
105. }
106.   static public void main(String[] passedArgs) {
107.     String[] appletArgs = new String[] { "Empty3Da" };
108.     if (passedArgs != null) {
109.       PApplet.main(concat(appletArgs, passedArgs));
110.     } else {
111.       PApplet.main(appletArgs);
112.     }
113.   }
114. }