我有一个类，该类的方法需要很长时间才能计算方程式的参数，因此在for循环迭代进行计算时，需要显示一个进度条。我正在尝试调用一个方法，该方法调用扩展JFrame的类，而该类又调用另一个具有扩展SwingWorker进度条的类，但是当我初始化jframe时，jframe上没有任何内容，并且为空白。为什么Jframe为空白。
我检查了它是否正在运行，并且循环和进度条循环都在运行。我还向Jframe类添加了JLabel，但它也没有出现。
Public class regression{
// method where i am initializing the jframe
public void approximate(){
this.findDerivative(this.exponential,this.quadratic);
matrix expAve = new matrix(3,1);
double beta1 = 0.9;
loading frame = new loading();
frame.setPreferredSize(new Dimension(500,500));
frame.pack();
frame.setVisible(true);
for(int i=0;i<100000000;i++){
matrix prev = expAve;
expAve.times(beta1);
matrix a = this.estimate.subtract(expAve);
this.computeGradient(a);
this.gradient.times(scale);
prev.times(beta1);
expAve = prev.addition(this.gradient);
this.estimate = this.estimate.subtract(expAve);
this.calcResidue();
}
}
//progress bar class
import java.awt.Dimension;
import java.util.List;
import javax.swing.JProgressBar;
import javax.swing.SwingWorker;
public class progressBar extends SwingWorker<Void, Integer> {
private final JProgressBar progress;
public progressBar(JProgressBar progress) {
this.progress = progress;
this.progress.setVisible(true);
this.progress.setStringPainted(true);
this.progress.setPreferredSize(new Dimension(500,100));
}
@Override
protected Void doInBackground() throws Exception {
for (int i = 100000000; i > 0; i--) {
final int progr =((100 * (100000000 - i)) /100000000);
publish(progr);
setProgress(progr);
}
return null;
}
@Override
protected void process(List<Integer> chunks) {
progress.setValue(chunks.get(chunks.size() - 1));
super.process(chunks);
}
@Override
protected void done() {
progress.setValue(100);
}
}
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JProgressBar;
//extending jframe class
public class loading extends JFrame{
public loading() {
setLayout(new BorderLayout());
JProgressBar progress = new JProgressBar();
JLabel j = new JLabel("loading");
add(j, BorderLayout.NORTH);
add(progress, BorderLayout.SOUTH);
progressBar worker = new progressBar(progress);
worker.execute();
j.setPreferredSize(new Dimension(500,50));
}
}
//main jframe where i call the jpanel vertex which calls the jframe loading
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.util.Random;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
class graph extends JFrame {
public graph() {
super("Scatterplot");
double[][]p = new double[][]{{2,1},{3,10},{4,99},{3.6,34}};
vertex v = new vertex(p,6, false, false, true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
getContentPane().add(v);
pack();
setLocationRelativeTo(null);
setVisible(true);
}
}
//jpanel where a paint method is creating a graph and where I want the
//loading Jframe to be initialized and show the loading progress.
import java.awt.*;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JLabel;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
import java.util.List;
import javax.swing.JProgressBar;
import javax.swing.SwingWorker;
import javax.swing.border.EmptyBorder;
class vertex extends JPanel{
//data points of all the transactions (date,amount)
public double[][] points;
public JLabel[] yInts = new JLabel[12];
public JLabel[] ints;
public double max = 0.0;
public double axis = 0.0;
public double size = 800.0;
public double yAxis = size/10.0;
public predictionAL lobf;
public regression n;
public boolean linear;
public vertex(double[][] p, double months, boolean linear, boolean expo,
boolean quad){
ints = new JLabel[(int) months];
this.points = new double[p.length][p[0].length];
this.linear = linear;
for(int x=0;x<p.length; x++){
for(int y=0;y<p[0].length;y++){
points[x][y] = p[x][y];
}
}
for(int x=0;x<p.length; x++){
if(Double.compare(p[x][1], this.max)>0){
this.max = p[x][1];
}
}
//max is the nearest tens
max = (10.0*Math.ceil(max/10.0));
axis = size/months;
setPreferredSize(new Dimension((int)(size)+20,(int)(size)+20));
setLayout(null);
if(this.linear){
lobf = new predictionAL(p);
}else{
n = new regression(expo, quad, p);
}
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
// (0,0) = (0,250) on frame.
//makes the points denser than the axis
//label the marks on the axis, where 10 is then 20 ...
g2d.setStroke(new BasicStroke(1));
//graph lines
for(int x=0; x <7; x++){
g2d.setColor(Color.red);
//y-axis lines , x=
g2d.draw(new Line2D.Double(x*axis,0,x*axis,size));
}
for(int x=0; x <11; x++){
g2d.setColor(Color.red);
//x-axis lines, y=
g2d.draw(new Line2D.Double(0, x*yAxis,size,x*yAxis));
}
g2d.setStroke(new BasicStroke(3));
g2d.setColor(Color.black);
for(int t=0; t <ints.length; t++){
ints[t] = new JLabel();
add(ints[t]);
//x axis
ints[t].setSize(200,13);
ints[t].setLocation((int)(t*axis), (int)(size));
if(t!=0){
ints[t].setText(Integer.toString(ints.length-t));
}
ints[t].setFont(new Font("Comic Sans MS", Font.PLAIN, 13));
}
for(int t=0; t <11; t++){
yInts[t] = new JLabel();
add(yInts[t]);
yInts[t].setSize(200,13);
yInts[t].setLocation(0,(int) (yAxis*(10-t)));
if(t!=0){
yInts[t].setText(Integer.toString((int)(this.max/10.0)*t));
}else{
yInts[t].setText("(6,0)");
}
yInts[t].setFont(new Font("Comic Sans MS", Font.PLAIN, 13));
}
//plot points
g2d.setStroke(new BasicStroke(5));
for(int x=0; x<points.length; x++){
double z = (points[x][0]);
double y = (points[x][1]);
double ratio = y/max;
g2d.draw(new Ellipse2D.Double(axis*(ints.length-z), (size)-
(size)*ratio,2,2));
}
g2d.setColor(Color.BLACK);
g2d.setStroke(new BasicStroke(2));
//time axis, x- axis
g2d.draw(new Line2D.Double(0,(size),size,(size)));
//amount axis, y -axis
g2d.draw(new Line2D.Double(0,(size),0,0));
if(this.linear){
double yRatio = (-ints.length*lobf.slope+lobf.yInt);
//draw line of best fit
g2d.draw(new Line2D.Double(0,size-(yRatio*size/max),size - axis*
(lobf.yInt/lobf.slope),size));
}else{
n.approximate();
System.out.println(n.estimate.arrayM[0][0]);
int[] xPoints = {5, 10 , 15, 20, 25, 30 ,35 };
int[] yPoints = new int[xPoints.length];
if(n.exponential){
for(int i=0; i<xPoints.length;i++){
yPoints[i] = (int) ((int)this.n.estimate.arrayM[0]
[0]*Math.exp(this.n.estimate.arrayM[1]
[0]*xPoints[i])+n.estimate.arrayM[2][0]);
}
}else{
for(int i=0; i<xPoints.length;i++){
yPoints[i] = (int) ((int)this.n.estimate.arrayM[0]
[0]*xPoints[i]*xPoints[i] + this.n.estimate.arrayM[1][0]*xPoints[i]
+ this.n.estimate.arrayM[2][0]);
}
}
g2d.drawPolyline(xPoints, yPoints, 3);
}
}
}
简而言之，jframe上没有进度条，并且在jframe类中添加了jlabel。请帮助。