Is thier a reason haveing a for loop in paint would cause a problem

Question

when i have a gui

Answer 1

Yes i whittled this down to make it more readable.
I am at a loss as to what the problem is,
running it illustrates the problem.
import java.applet.*;
import java.awt.*;
import javax.swing.*;
public class thebug extends Applet {
Image osImg;                     // offscreen image
Graphics osG ;                    // off screen graphics
boolean startOut = true;      // first time painting
Dimension curD ;                 // current size of offscreen stuff
int c = 0;int v = 0; int vv = 0;
int degreesZ = 1;int degreesX = 1;int degreesY = 1;
int off_set = 150 ;
int Xa = 1; int Ya = 1; int Za = 1;
int Xb = 1;int Yb = 1;int Zb = 1;
int Xp =50;int Yp = -50;int Zp =1;
                      public void init() { }       
                      public void update (Graphics g) { paint(g);  }
     public void paint(Graphics g) { //---------------------------------------------------------------------   
     for(degreesZ = 1;degreesZ <=360;degreesZ++){  //test loop  this is z rotation instep 
                 if (startOut == true){  // is this the first time painting
                 curD = getSize();
                 osImg = createImage (curD.width ,curD.height);
                 osG = osImg.getGraphics();
                 startOut = false ;
                 // has the component been resized
                 if ((curD.width !=getSize().width) || (curD.height !=getSize().height)){
                 curD =getSize();
                 osImg = createImage (curD.width,curD.height);
                 osG = osImg.getGraphics();
                          osG.setColor(Color.red);
                          osG.fillRect(0,0,300,300);      
                           c++;  // this is just for the color can be removed
                           switch(c){
                           case 1: osG.setColor(Color.black);break;
                           case 2: osG.setColor(Color.blue);c=0;break;   
                           default :{c=0;}  
                           }     // end switch/case
    //setup to rotate the point    
    Xa=Xp;Ya=Yp;Za=Zp;                              
    double radiansZ =  ( Math.PI * degreesZ )/180;
    double radiansX = ( Math.PI * degreesX )/180;
    double radiansY = ( Math.PI * degreesY )/180;                  
    //   rotate on the  axises z,x,y
    Xb = (int)(Xa * Math.cos(radiansZ) - Ya * Math.sin(radiansZ) );
    Yb = (int)(Ya * Math.cos(radiansZ) + Xa * Math.sin(radiansZ) );          
    Yb = (int)(Yb * Math.cos(radiansX) - Za * Math.sin(radiansX) );
    Zb = (int)(Yb * Math.sin(radiansX) + Za * Math.cos(radiansX) );   
    Zb = (int)(Zb * Math.cos(radiansY) - Xb * Math.sin(radiansY) );
    Xb = (int)(Zb * Math.sin(radiansY) + Xb * Math.cos(radiansY) );
    // add a screen offset
    Xb = Xb+off_set;
    Yb = Yb+off_set;
    Zb = Zb;
                  osG.drawLine(off_set,off_set,Xb,Yb);   //draw it
                  g.drawImage(osImg,0,0,this );  
    System.out.println( "end degree loop" );
    } // end degree loop      
             osG.dispose(); 
    System.out.println( "####end paint####" );
    } // end paint ------------------------------------------------------------------------------------------