SetBackground(Color.WHITE) not working

Question

I am trying to set background color to white, but it's not working. Can anyone find out the problem?
import java.io.*;
import java.util.*;
import java.awt.*;
import javax.swing.*;
import java.awt.font.FontRenderContext;
import java.awt.font.LineMetrics;
import java.awt.font.TextLayout;
import java.awt.geom.*;
public class Lab3ex2 {
     * @param args ignored
     public static void main(String[] args) throws IOException {
          // Station[] stations = new Station[100];
          // int n = 0;
          ArrayList<Station> stations = new ArrayList<Station>();
          ArrayList xPos = new ArrayList();
          ArrayList yPos = new ArrayList();
          final String fname = "C://Positions-v2.csv";
          BufferedReader br = new BufferedReader(new FileReader(fname));
          String stationName, item, line;
          line = br.readLine(); // first line skipped
          line = br.readLine(); // 2nd
          while (line != null) {
               StringTokenizer stoke = new StringTokenizer(line, ",");
               stationName = stoke.nextToken().trim();
               item = stoke.nextToken();
               float x = Float.parseFloat(item);
               item = stoke.nextToken();
               float y = Float.parseFloat(item);
               item = stoke.nextToken();
               String justification = item;
               // stations[n] = new Station(stationName, x, y);
               // n++;
               stations.add(new Station(stationName, x, y, justification));
               xPos.add(x);
               yPos.add(y);
               line = br.readLine(); // line 3,4,...
          for (Station station : stations) {
               System.out.println(station);
               //System.out.printf("%20s %6.1f,%6.1f)%n",station.name, station.x, station.y);
          System.out.print("Press enter...");
          System.in.read();
          JFrame f = new JFrame("Lab3ex2");
          f.add(new MyPanel(stations, xPos, yPos));
          f.setSize(500,400);
          f.setVisible(true);
          f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // to avoid needing ^C
class Station {
     public String name;
     public float x;
     public float y;
     public String justification;
     public Station(String name, float x, float y, String justification) {
          this.name = name;
          this.x = x;
          this.y = y;
          this.justification = justification;
     public String toString() {
          // todo: format x and y
          return name + " (" + x + "," + y + ")";
class MyPanel extends JPanel {
     private ArrayList<Station> stations;
     private float xMax, yMax;
     private ArrayList xPos;
     private ArrayList yPos;
     public void paintComponent(Graphics g) {
          Graphics2D g2 = (Graphics2D)g;
          Dimension dim = getSize();
          float xScale, yScale, scale, x, y, radius = 1.0f, diam;
          String justification = null;
          diam = 2.0f*radius;
          Shape s;
          xScale = dim.width/xMax;
          yScale = dim.height/yMax;
          scale = Math.min(xScale, yScale);
          g2.scale(scale, scale);
          g2.setStroke(new BasicStroke(1.0f/scale)); // thin lines
          g2.setFont(new Font("SanSerif", Font.PLAIN, (int)(11.2f/scale))); // always 12 approx
          int total = 0;
          for (Station st : stations) {
               if(st.name.length()>total)
                    total = st.name.length();
          for (Station st : stations) {
               x = st.x - radius;
               y = st.y - radius;
               justification = st.justification;
               s = new Ellipse2D.Float(x, y, 2.0f*radius, 2.0f*radius);
               g2.draw(s);
               g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                         RenderingHints.VALUE_ANTIALIAS_ON);
               if(justification.equals("R"))
                    g2.drawString(st.name, (x-st.name.length())-2, (y+diam));
               else
                    g2.drawString(st.name, (x+diam+radius), (y+diam));
GeneralPath theShape = new GeneralPath();
     theShape.moveTo((float)(Float)xPos.get(0), (float)(Float)yPos.get(0));
for(int i=0; i<15; i++)
     theShape.lineTo((float)(Float)xPos.get(i), (float)(Float)yPos.get(i));
g2.draw(theShape);
this.setBackground(Color.WHITE);
     public MyPanel(ArrayList<Station> stations, ArrayList xPos, ArrayList yPos) {
          this.stations = stations;
          this.xPos = xPos;
          this.yPos = yPos;
          xMax = -99999.0f;
          yMax = -99999.0f;
          for (Station st : stations) {
               if (st.x > xMax) xMax = st.x;
               if (st.y > yMax) yMax = st.y;
}

Answer 1

import java.io.*;
import java.util.*;
import java.awt.*;
import javax.swing.*;
import java.awt.font.FontRenderContext;
import java.awt.font.LineMetrics;
import java.awt.font.TextLayout;
import java.awt.geom.*;
* Advanced Java Lab 3 ex 2: reading and drawing Met station data
* @author rallen
public class Lab3ex2 {
      * @param args
      *            ignored
     public static void main(String[] args) throws IOException {
          // Station[] stations = new Station[100];
          // int n = 0;
          ArrayList<Station> stations = new ArrayList<Station>();
          ArrayList xPos = new ArrayList();
          ArrayList yPos = new ArrayList();
          final String fname = "C://Positions-v2.csv";
          BufferedReader br = new BufferedReader(new FileReader(fname));
          String stationName, item, line;
          line = br.readLine(); // first line skipped
          line = br.readLine(); // 2nd
          while (line != null) {
               StringTokenizer stoke = new StringTokenizer(line, ",");
               stationName = stoke.nextToken().trim();
               item = stoke.nextToken();
               float x = Float.parseFloat(item);
               item = stoke.nextToken();
               float y = Float.parseFloat(item);
               item = stoke.nextToken();
               String justification = item;
               // stations[n] = new Station(stationName, x, y);
               // n++;
               stations.add(new Station(stationName, x, y, justification));
               xPos.add(x);
               yPos.add(y);
               line = br.readLine(); // line 3,4,...
          for (Station station : stations) {
               System.out.println(station);
               // System.out.printf("%20s %6.1f,%6.1f)%n",station.name, station.x,
               // station.y);
          System.out.print("Press enter...");
          System.in.read();
          JFrame f = new JFrame("Lab3ex2");
          f.add(new MyPanel(stations, xPos, yPos));
          f.setSize(500, 400);
          f.setVisible(true);
          f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // to avoid needing ^C
class Station {
     public String name;
     public float x;
     public float y;
     public String justification;
     public Station(String name, float x, float y, String justification) {
          this.name = name;
          this.x = x;
          this.y = y;
          this.justification = justification;
     public String toString() {
          // todo: format x and y
          return name + " (" + x + "," + y + ")";
class MyPanel extends JPanel {
     private ArrayList<Station> stations;
     private float xMax, yMax;
     private ArrayList xPos;
     private ArrayList yPos;
     public void paintComponent(Graphics g) {
          super.paintComponent(g);
          this.setLayout(new FlowLayout());
          Graphics2D g2 = (Graphics2D) g;
          Dimension dim = getSize();
          float xScale, yScale, scale, x, y, radius = 1.0f, diam;
          String justification = null;
          diam = 2.0f * radius;
          Shape s;
          xScale = dim.width / xMax;
          yScale = dim.height / yMax;
          scale = Math.min(xScale, yScale);
          g2.scale(scale, scale);
          g2.setStroke(new BasicStroke(1.0f / scale)); // thin lines
          g2.setFont(new Font("SanSerif", Font.PLAIN, (int) (11.2f / scale))); // always
                                                                                                    // 12
                                                                                                    // approx
          int total = 0;
          for (Station st : stations) {
               if (st.name.length() > total)
                    total = st.name.length();
          for (Station st : stations) {
               x = st.x - radius;
               y = st.y - radius;
               justification = st.justification;
               s = new Ellipse2D.Float(x, y, 2.0f * radius, 2.0f * radius);
               g2.draw(s);
               g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                         RenderingHints.VALUE_ANTIALIAS_ON);
               if (justification.equals("R")) {
                    g2.drawString(st.name, (x - st.name.length()) - 2, (y + diam));
               } else {
                    g2.drawString(st.name, (x + diam + radius), (y + diam));
          GeneralPath theShape = new GeneralPath();
          theShape.moveTo((float) (Float) xPos.get(0), (float) (Float) yPos
                    .get(0));
          for (int i = 0; i < 15; i++) {
               theShape.lineTo((float) (Float) xPos.get(i), (float) (Float) yPos
                         .get(i));
          g2.draw(theShape);
          setOpaque(true);
     public MyPanel(ArrayList<Station> stations, ArrayList xPos, ArrayList yPos) {
          this.stations = stations;
          this.xPos = xPos;
          this.yPos = yPos;
          xMax = -99999.0f;
          yMax = -99999.0f;
          for (Station st : stations) {
               if (st.x > xMax)
                    xMax = st.x;
               if (st.y > yMax)
                    yMax = st.y;
          this.setBackground(Color.WHITE);
          this.setVisible(true);
}Edited by: swapnil_raverkar on Sep 21, 2008 5:10 AM