可以在main之外的类中使用进度条吗？

Right now, my main just calls a gui with 10 rows. Based on how many of those rows have text, 1 of 9 classes is called (two rows must have text). The called class performs calculations that I'd like to have the progress bar tied to. Here is an example of one of the called classes (each class is similar, but different enough to warrant a new class.) I believe the problem is a violation of EDT rules, but all the examples I've seen on them involve a main argument. The frame appears when the code is run, but the progress bar doesn't update until all calculations are completed.

现在，我的主要只是用10行调用一个gui。根据这些行中有多少行有文本，调用9个类中的1个（两行必须有文本）。被调用的类执行计算，我希望将进度条绑定到。以下是其中一个被调用类的示例（每个类都相似，但不同以足以保证新类。）我认为问题违反了EDT规则，但我在其上看到的所有示例都涉及到论据。代码运行时会出现框架，但在完成所有计算之前，进度条不会更新。

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class twoLoan extends JFrame {

    static JFrame progressFrame;
    static JProgressBar progressBar;
    static Container pane;
    double amountSaved = 0;
    int i = 0;

    public void runCalcs(Double MP, Double StepAmt,
        Double L1, Double L2, Double C1, Double C2,
        Double IM1, Double IM2, Double M1Start, Double M2Start) {

        try {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        } catch (Exception e) {
        }

        int iterations = (int) (MP - (M1Start * M2Start));

        //Create all components
        progressFrame = new JFrame("Calculation Progress");
        progressFrame.setSize(300, 100);
        pane = progressFrame.getContentPane();
        pane.setLayout(null);
        progressFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        progressBar = new JProgressBar(0, iterations);

        //Add components to pane
        pane.add(progressBar);

        //Position controls (X, Y, width, height)
        progressBar.setBounds(10, 10, 280, 20);

        //Make frame visible
        progressFrame.setResizable(false); //No resize
        progressFrame.setVisible(true);

        double M1 = M1Start;
        double M2 = M2Start;

        // Set MinLoop as maximum to start
        // Loan 1
        double N1 = (Math.log10(1 - IM1 * L1 / M1) * -1) / Math.log10(1 + IM1);
        double M1Sum = M1 * N1;
        // Loan 2
        double N2 = (Math.log10(1 - IM2 * L2 / M2) * -1) / Math.log10(1 + IM2);
        double M2Sum = M2 * N2;
        double minLoop = M1Sum + M2Sum;
        double MTotal = 0;


        // Define variables for mins
        double MP1 = 0;
        double MP2 = 0;
        double NP1 = 0;
        double NP2 = 0;
        double MP1Sum = 0;
        double MP2Sum = 0;

        while (M1 <= MP - M2Start && M2 >= M2Start) {
            N1 = (Math.log10(1 - IM1 * L1 / M1) * -1) / Math.log10(1 + IM1);
            M1Sum = N1 * M1;
            N2 = (Math.log10(1 - IM2 * L2 / M2) * -1) / Math.log10(1 + IM2);
            M2Sum = N2 * M2;
            MTotal = M1Sum + M2Sum;
            if (MTotal < minLoop) {
                minLoop = MTotal;
                MP1 = M1;
                MP2 = M2;
                NP1 = N1;
                NP2 = N2;
                MP1Sum = M1Sum;
                MP2Sum = M2Sum;
            } // end if
            M1 = M1 + StepAmt;
            M2 = MP - M1;
            // Reset monthly sums
            M1Sum = 0;
            M2Sum = 0;
            i++;
            progressBar.setValue(i);
            progressBar.repaint();
            if (i >= iterations) {
                progressFrame.dispose();
            }
        } // end while

        // if there's a value for current payments, calculate amount saved
        if (C1 > 0) {
            double CN1 = (Math.log10(1 - IM1 * L1 / C1) * -1) / Math.log10(1 + IM1);
            double CT1 = CN1 * C1;

            double CN2 = (Math.log10(1 - IM2 * L2 / C2) * -1) / Math.log10(1 + IM2);
            double CT2 = CN2 * C2;

            double CTotal = CT1 + CT2;
            amountSaved = CTotal - minLoop;
        }

    } // end method runCalcs

    //Workbook wb = new HSSFWorkbook();
    public double savedReturn() {
        return amountSaved;
    }
} // end class twoLoans  

3 个解决方案

#1

SwingWorker is ideal for this. The example below performs a simple iteration in the background, while reporting progress and intermediate results in a window. You can pass whatever parameters you need in a suitable SwingWorker constructor.

SwingWorker非常适合这种情况。下面的示例在后台执行简单迭代，同时在窗口中报告进度和中间结果。您可以在合适的SwingWorker构造函数中传递所需的任何参数。

import java.awt.EventQueue;
import java.awt.GridLayout;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.text.DecimalFormat;
import java.util.List;
import javax.swing.*;

/** @see http://*.com/questions/4637215 */
public class TwoRoot extends JFrame {

    private static final String s = "0.000000000000000";
    private JProgressBar progressBar = new JProgressBar(0, 100);
    private JLabel label = new JLabel(s, JLabel.CENTER);

    public TwoRoot() {
        this.setLayout(new GridLayout(0, 1));
        this.setTitle("√2");
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.add(progressBar);
        this.add(label);
        this.setSize(161, 100);
        this.setLocationRelativeTo(null);
        this.setVisible(true);
    }

    public void runCalc() {
        progressBar.setIndeterminate(true);
        TwoWorker task = new TwoWorker();
        task.addPropertyChangeListener(new PropertyChangeListener() {

            @Override
            public void propertyChange(PropertyChangeEvent e) {
                if ("progress".equals(e.getPropertyName())) {
                    progressBar.setIndeterminate(false);
                    progressBar.setValue((Integer) e.getNewValue());
                }
            }
        });
        task.execute();
    }

    private class TwoWorker extends SwingWorker<Double, Double> {

        private static final int N = 5;
        private final DecimalFormat df = new DecimalFormat(s);
        double x = 1;

        @Override
        protected Double doInBackground() throws Exception {
            for (int i = 1; i <= N; i++) {
                x = x - (((x * x - 2) / (2 * x)));
                setProgress(i * (100 / N));
                publish(Double.valueOf(x));
                Thread.sleep(1000); // simulate latency
            }
            return Double.valueOf(x);
        }

        @Override
        protected void process(List<Double> chunks) {
            for (double d : chunks) {
                label.setText(df.format(d));
            }
        }
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                TwoRoot t = new TwoRoot();
                t.runCalc();
            }
        });
    }
}

#2

I think you premonition is right, you need to adhere to Swing threading rules.

我认为你的预感是正确的，你需要遵守Swing线程规则。

So what to do?

那么该怎么办？

First, I am not sure how your app is designed exactly. You say that you have a main frame with a bunch of rows, and potentially each could potentially call one of 9 classes, and they all look like the one above. It seems that these classes will generate their own JFrame. I guess that this new frame is solely used for the progress bar. I will assume that this is the design and will suggest accordingly.

首先，我不确定您的应用程序是如何精确设计的。你说你有一个带有一堆行的主框架，并且可能每个都可以调用9个类中的一个，它们看起来都像上面那样。看来这些类会生成自己的JFrame。我想这个新框架仅用于进度条。我会假设这是设计，并会相应地提出建议。

I suggest that you perform a couple actions in instances of Runnable, and you drop those Runnable instances into SwingUtilities.invokeLater to have them run on the EDT. At the same time, I would take the time to reorganize your code for ease if reading.

我建议您在Runnable实例中执行一些操作，然后将这些Runnable实例放入SwingUtilities.invokeLater以使它们在EDT上运行。与此同时，如果阅读，我会花时间重新组织您的代码以方便。

1. move the creation of your GUI bits into a method:
2. 将GUI位的创建移动到方法中：

public void createComponents () {
      SwingUtilities.invokeLater(new Runnable() {
        public void run() {
          //Create all components
          progressFrame = new JFrame("Calculation Progress");
          progressFrame.setSize(300, 100);
          pane = progressFrame.getContentPane();
          pane.setLayout(null);
          progressFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          progressBar = new JProgressBar(0, iterations);
          //Add components to pane
          pane.add(progressBar);

          //Position controls (X, Y, width, height)
          progressBar.setBounds(10, 10, 280, 20);

          //Make frame visible
          progressFrame.setResizable(false); //No resize
          progressFrame.setVisible(true);
       }
      });

    }

1. Then I would methodize the two GUI actions that you have in your calc:
2. 然后我会方法化你在calc中的两个GUI动作：

     private void updateProgressBar(final int i) {
           SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                   progressBar.setValue(i);
                   //no need for the following
                   //progressBar.repaint(); 

                }
           });
    }

    private void killDialog() {
           SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                    progressFrame.setVisible(false);
                }
            });
    } 

1. Finally, replace where the code contained in these new methods with calls to the methods.
2. 最后，通过调用方法替换这些新方法中包含的代码。

#3

Thanks for the help. I started with trying to use the first response, but I couldn't get the bar to run concurrently, and it ran when the program finished. I'm sure it would work, but I wasn't able to figure it out. Using trashgod's response and some other examples, I was able to get it to work using SwingWorker. Unfortunately, I don't totally understand how it works, but I'll take it for now.

谢谢您的帮助。我开始尝试使用第一个响应，但是我无法让它同时运行，并且在程序结束时运行。我相信它会起作用，但我无法弄明白。使用trashgod的响应和其他一些示例，我能够使用SwingWorker使其工作。不幸的是，我并不完全理解它是如何工作的，但我现在就把它拿走。

The gui and method to run the calculations are called in another class first:

运行计算的gui和方法首先在另一个类中调用：

iterations = (int) (MPay - (M1Start + M2Start));
        twoLoan myLoan = new twoLoan();
        myLoan.createGui(iterations);
        myLoan.runCalcs(MPay, Step, L1, L2, C1, C2, IM1, IM2, M1Start, M2Start);

Then it runs as follows:

然后它运行如下：

public class twoLoan extends JFrame {

    JFrame progressFrame;
    JProgressBar progressBar;
    JLabel label = new JLabel("Calculating...");;
    Container pane;

    double amountSaved = 0;
    int i = 0;
    int iterations;

    public void createGui(int iterations) {
           //Create all components
          progressFrame = new JFrame("Calculation Progress");
          progressFrame.setSize(300, 100);
          pane = progressFrame.getContentPane();
          pane.setLayout(null);
          label = new JLabel("Calculating...");
          label.setBounds(115, 35, 200, 25);
          progressBar = new JProgressBar(0, iterations);
          progressBar.setBounds(10, 10, 280, 20);
          progressBar.setStringPainted(true);
          //Add components to pane
          pane.add(progressBar);
          pane.add(label);
          //Make frame visible
          progressFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          progressFrame.setResizable(false); //No resize
          progressFrame.setLocationRelativeTo(null);
          progressFrame.setVisible(true);
    }

    public void runCalcs (double MP, double StepAmt, double L1, double L2,
            double C1, double C2, double IM1, double IM2, double M1Start, double M2Start) {

        progressBar.setIndeterminate(false);
        TwoWorker task = new TwoWorker(MP, StepAmt, L1, L2, C1, C2, IM1, IM2, M1Start, M2Start);
        task.addPropertyChangeListener(new PropertyChangeListener() {

            @Override
            public void propertyChange(PropertyChangeEvent e) {
                if ("progress".equals(e.getPropertyName())) {
                    progressBar.setIndeterminate(false);
                    progressBar.setValue((Integer) e.getNewValue());
                }
            }
        });
        task.execute();
    } //end method runCalcs

    public class TwoWorker extends SwingWorker<Double, Double> {

        private final double MP, StepAmt,L1, L2,
            C1, C2, IM1, IM2, M1Start, M2Start;

        public TwoWorker(double MPa, double StepAmta, double L1a, double L2a,
            double C1a, double C2a, double IM1a, double IM2a, double M1Starta, double M2Starta) {

            MP = MPa;
            StepAmt = StepAmta;
            L1 = L1a;
            L2 = L2a;
            C1 = C1a;
            C2 = C2a;
            IM1 = IM1a;
            IM2 = IM2a;
            M1Start = M1Starta;
            M2Start = M2Starta;
           }
        @Override
        protected Double doInBackground() {

            double M1 = M1Start;
            double M2 = M2Start;

        // Set MinLoop as maximum to start
        // Loan 1
        double N1 = (Math.log10(1 - IM1 * L1 / M1) * -1)/Math.log10(1 + IM1);
    double M1Sum = M1 * N1;
    // Loan 2
    double N2 = (Math.log10(1 - IM2 * L2 / M2) * -1)/Math.log10(1 + IM2);
    double M2Sum = M2 * N2;
    double minLoop = M1Sum + M2Sum;
    double MTotal = 0;

        // Define variables for mins
    double MP1 = 0;
    double MP2 = 0;
    double NP1 = 0;
    double NP2 = 0;
    double MP1Sum = 0;
    double MP2Sum = 0;

        while ( M1 <= MP - M2Start && M2 >= M2Start ) {
            N1 = (Math.log10(1 - IM1 * L1 / M1) * -1)/Math.log10(1 + IM1);
            M1Sum = N1 * M1;
            N2 = (Math.log10(1 - IM2 * L2 / M2) * -1)/Math.log10(1 + IM2);
            M2Sum = N2 * M2;
            MTotal = M1Sum + M2Sum;
            if (MTotal < minLoop) {
                minLoop = MTotal;
                MP1 = M1;
                MP2 = M2;
                NP1 = N1;
                NP2 = N2;
                MP1Sum = M1Sum;
                MP2Sum = M2Sum;
            } // end if
                        i++;
                        progressBar.setValue(i);
                    M1 = M1 + StepAmt;
            M2 = MP - M1;
            // Reset monthly sums
            M1Sum = 0;
            M2Sum = 0;
        } // end while

        System.out.printf("MP1 = %.2f\n", MP1);
        System.out.printf("MP2 = %.2f\n", MP2);
        System.out.printf("NP1 = %.2f\n", NP1);
        System.out.printf("NP2 = %.2f\n", NP2);
        System.out.printf("MP1Sum = %.2f\n", MP1Sum);
        System.out.printf("MP2Sum = %.2f\n", MP2Sum);
                System.out.printf("MTotal = %.2f\n", minLoop);
                System.out.printf("i = %d\n",i);
                System.out.printf("M1Start = %.2f\n", M1Start);
        System.out.printf("M2Start = %.2f\n", M2Start);
                System.out.printf("MP= %.2f\n",MP);

    // if there's a value for current payments, calculate amount saved
    if( C1 > 0 ) {
        double CN1 = (Math.log10(1 - IM1 * L1 / C1) * -1)/Math.log10(1 + IM1);
        double CT1 = CN1 * C1;

        double CN2 = (Math.log10(1 - IM2 * L2 / C2) * -1)/Math.log10(1 + IM2);
        double CT2 = CN2 * C2;

        double CTotal = CT1 + CT2;
        amountSaved = CTotal - minLoop;
        } // end if

        return null;

    } // end doInBackGround

        @Override
        protected void done() {
            label.setBounds(133, 35, 200, 25);
            label.setText("Done!");
        }
    } // end TwoWorker


    public double savedReturn() {
        return amountSaved;
    }

} // end class twoLoans