Can't resolve java.lang.System.out

Question

Hi,develpoers:
Does anyone know how to fix this problem:
C:\cai\VCTest\robo-sdk\build\sun\robot\vision\Search1.java:57: cannot resolve symbol
symbol : variable out
location: class java.lang.System
System.out.println("Look returned null VisionImage");
I don't know why this error occured because this application ran well last day.
Thanks in advance!
Cai

Answer 1

But there is no other variable named "System". All the fields of "System" cannot be used but System.exit(1)can work. And all the methods of String like trim()can not work. Below is the codes:
package sun.robot.vision;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import SK.gnome.twain.*;
import sun.robot.vision.*;
import java.lang.System;
import java.io.*;
public class Search1
public Search1() {
public void searchPuck(String colourString) {
Image i;
boolean found = false;
VisionImage image = null;
byte colour = VisionImage.NO_COLOUR;
if (colourString.equals("red"))
colour = VisionImage.RED;
if (colourString.equals("blue"))
colour = VisionImage.BLUE;
if (colour == VisionImage.NO_COLOUR) {
System.out.println("Invalid colour. Must be one of red or blue");
System.exit(1);
while (!found) {
TwainSource source = null;
/* grab an image from the camera */
try {
          try{      source=TwainManager.getDefaultSource();}catch(Exception e){}
               i=Toolkit.getDefaultToolkit().createImage(source);
          image = new VisionImage(i);          
          if (image == null) {
System.out.println("Look returned null VisionImage");//here got the error
System.exit(1);
} catch (VisionException ve) {
// System.out.println("Unable to look");
// System.out.println(ve.getMessage());
System.exit(1);
image.setDebugLevel(2);
if (image.canYouSee(colour) == false){}
//do nothing
else
found = true;
VisionObject puck = image.getVisionObject(colour);
if (puck == null) {
// System.out.println("Internal Error: ball is null object");
System.exit(1);
/* Print a message to tell the user that we've found the ball and
* where it is relative to the robot
StringBuffer saw = new StringBuffer("I see the ball " );
          StringBuffer size = new StringBuffer( );
if (puck != null) {
int pos = puck.getPosition();
switch (pos) {
case VisionObject.LEFT:
saw.append("to the left of the robot");
break;
case VisionObject.CENTRE:
saw.append("in front of the robot");
break;
case VisionObject.RIGHT:
saw.append("to the right of the robot");
break;
          size.append(image.getHeight()+","+image.getWidth());
// System.out.println(size.toString());
// System.out.println(saw.toString());
Point c = puck.getCentre();
mc.send(3);
//System.exit(0);
public static void main(String[] args) {
if (args.length < 1) {
//System.out.println("Usage: Fetch <ball_colour>");
System.exit(1);
//System.out.println("it is me");
// String colourString = args[0].toLowerCase();
     String colourString = args[0];
     colourString= colourString.trim();//trim cannot work
Search1 f = new Search1();
f.searchPuck(colourString);
Any help will be highly approciated.
Cai