我想我做的一切都是對的。我想要的只是在加載組件和視窗的主執行緒完成后加載包含圖表的執行緒。但它沒有用。不知何故，我必須單擊jPanel1（將加載圖表的面板）并加載圖表。任何幫助，將不勝感激。我試過的：
- 將執行緒更改為
SwingWorker - 將執行緒更改為
invokeLater
public LaporanPenjualan() {
initComponents();
createFrame1();
}
private void createFrame1() {
SwingWorker thread = new SwingWorker() {
@Override
protected Boolean doInBackground() throws Exception {
JLabel loading = new JLabel("Loading, please wait",SwingConstants.CENTER);
loading.setSize(500,500);
loading.setAlignmentY(250);
jPanel1.add(loading);
final DefaultCategoryDataset dataset = new DefaultCategoryDataset();
dataset.addValue(34.0, "Penjualan/produk", "Kue Enak");
dataset.addValue(23.0, "Penjualan/produk", "Kue Enggak Enak");
dataset.addValue(54.0, "Penjualan/produk", "Kue Sultan");
final JFreeChart chart = ChartFactory.createBarChart(
"",
"Produk",
"Penjualan",
dataset,
PlotOrientation.VERTICAL,
true,
true,
false
);
final ChartPanel chartPanel = new ChartPanel(chart);
chartPanel.setSize(500,500);
chartPanel.setPreferredSize(new Dimension(300, 300));
jPanel1.removeAll();
jPanel1.add(chartPanel);
chartPanel.setVisible(true);
return true;
}
};
thread.execute();
}
uj5u.com熱心網友回復：
Swing 是單執行緒的，不是執行緒安全的。這意味著您不應在事件調度執行緒的背景關系中執行任何長時間運行或阻塞的操作，也不應從 EDT 的背景關系之外修改 UI 的狀態或 UI 依賴的任何狀態。
所以，話雖如此，你createFrame1可能看起來更像......
private void createFrame1() {
JLabel loading = new JLabel("Loading, please wait", SwingConstants.CENTER);
loading.setSize(500, 500);
loading.setAlignmentY(250);
jPanel1.add(loading);
jPanel1.revalidate();
jPanel1.repaint();
SwingWorker<DefaultCategoryDataset, Void> thread;
thread = new SwingWorker<>() {
@Override
protected DefaultCategoryDataset doInBackground() throws Exception {
final DefaultCategoryDataset dataset = new DefaultCategoryDataset();
dataset.addValue(34.0, "Penjualan/produk", "Kue Enak");
dataset.addValue(23.0, "Penjualan/produk", "Kue Enggak Enak");
dataset.addValue(54.0, "Penjualan/produk", "Kue Sultan");
return dataset;
}
@Override
protected void done() {
try {
DefaultCategoryDataset dataset = get();
final JFreeChart chart = ChartFactory.createBarChart(
"",
"Produk",
"Penjualan",
dataset,
PlotOrientation.VERTICAL,
true,
true,
false
);
final ChartPanel chartPanel = new ChartPanel(chart);
jPanel1.removeAll();
jPanel1.add(chartPanel);
chartPanel.setVisible(true);
} catch (InterruptedException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
} catch (ExecutionException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
}
}
};
thread.execute();
}
或者，如果加載資料需要時間，您可以發布每個資料點...
public class DataPoint {
private double value;
private Comparable rowKey;
private Comparable columnKey;
public DataPoint(double value, Comparable rowKey, Comparable columnKey) {
this.value = value;
this.rowKey = rowKey;
this.columnKey = columnKey;
}
public double getValue() {
return value;
}
public Comparable getRowKey() {
return rowKey;
}
public Comparable getColumnKey() {
return columnKey;
}
}
private void createFrame1() {
SwingWorker<Void, DataPoint> thread;
DefaultCategoryDataset dataSet = new DefaultCategoryDataset();
final JFreeChart chart = ChartFactory.createBarChart(
"",
"Produk",
"Penjualan",
dataSet,
PlotOrientation.VERTICAL,
true,
true,
false
);
final ChartPanel chartPanel = new ChartPanel(chart);
jPanel1.add(chartPanel);
thread = new SwingWorker<>() {
@Override
protected Void doInBackground() throws Exception {
publish(new DataPoint(34.0, "Penjualan/produk", "Kue Enak"));
publish(new DataPoint(23.0, "Penjualan/produk", "Kue Enggak Enak"));
publish(new DataPoint(54.0, "Penjualan/produk", "Kue Sultan"));
}
@Override
protected void process(List<DataPoint> chunks) {
for (DataPoint dp : chunks) {
dataSet.addValue(dp.getValue(), dp.getRowKey(), dp.getColumnKey());
}
}
};
thread.execute();
}
可運行示例...
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingWorker;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.DefaultCategoryDataset;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame();
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setLayout(new BorderLayout());
DefaultCategoryDataset dataSet = new DefaultCategoryDataset();
final JFreeChart chart = ChartFactory.createBarChart(
"",
"Produk",
"Penjualan",
dataSet,
PlotOrientation.VERTICAL,
true,
true,
false
);
final ChartPanel chartPanel = new ChartPanel(chart);
add(chartPanel);
ChartWorker worker = new ChartWorker(dataSet);
worker.execute();
}
}
public class ChartWorker extends SwingWorker<Void, ChartWorker.DataPoint> {
public class DataPoint {
private double value;
private Comparable rowKey;
private Comparable columnKey;
public DataPoint(double value, Comparable rowKey, Comparable columnKey) {
this.value = value;
this.rowKey = rowKey;
this.columnKey = columnKey;
}
public double getValue() {
return value;
}
public Comparable getRowKey() {
return rowKey;
}
public Comparable getColumnKey() {
return columnKey;
}
}
private DefaultCategoryDataset dataSet;
public ChartWorker(DefaultCategoryDataset dataSet) {
this.dataSet = dataSet;
}
@Override
protected Void doInBackground() throws Exception {
// The sleeps here are just for demonstration,
// you don't need them
Thread.sleep(1000);
publish(new DataPoint(34.0, "Penjualan/produk", "Kue Enak"));
Thread.sleep(1000);
publish(new DataPoint(23.0, "Penjualan/produk", "Kue Enggak Enak"));
Thread.sleep(1000);
publish(new DataPoint(54.0, "Penjualan/produk", "Kue Sultan"));
return null;
}
@Override
protected void process(List<DataPoint> chunks) {
for (DataPoint dp : chunks) {
dataSet.addValue(dp.getValue(), dp.getRowKey(), dp.getColumnKey());
}
}
}
}
并等待事情完成...
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.concurrent.ExecutionException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingWorker;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.category.DefaultCategoryDataset;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame();
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setLayout(new BorderLayout());
add(new JLabel("Loading stuff", JLabel.CENTER));
ChartWorker worker = new ChartWorker();
worker.addPropertyChangeListener(new PropertyChangeListener() {
@Override
public void propertyChange(PropertyChangeEvent evt) {
if ("state".equals(evt.getPropertyName())) {
if (worker.getState() == SwingWorker.StateValue.DONE) {
try {
DefaultCategoryDataset dataSet = worker.get();
setDataSet(dataSet);
} catch (InterruptedException ex) {
add(new JLabel("Loading fauked", JLabel.CENTER));
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
} catch (ExecutionException ex) {
add(new JLabel("Loading fauked", JLabel.CENTER));
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
}
});
worker.execute();
}
@Override
public Dimension getPreferredSize() {
return new Dimension(400, 400);
}
protected void setDataSet(DefaultCategoryDataset dataSet) {
final JFreeChart chart = ChartFactory.createBarChart(
"",
"Produk",
"Penjualan",
dataSet,
PlotOrientation.VERTICAL,
true,
true,
false
);
final ChartPanel chartPanel = new ChartPanel(chart);
removeAll();
add(chartPanel);
revalidate();
repaint();
}
}
public class ChartWorker extends SwingWorker<DefaultCategoryDataset, Void> {
public ChartWorker() {
}
@Override
protected DefaultCategoryDataset doInBackground() throws Exception {
DefaultCategoryDataset dataSet = new DefaultCategoryDataset();
dataSet.addValue(34.0, "Penjualan/produk", "Kue Enak");
dataSet.addValue(23.0, "Penjualan/produk", "Kue Enggak Enak");
dataSet.addValue(54.0, "Penjualan/produk", "Kue Sultan");
// Again, you don't need this
Thread.sleep(5000);
return dataSet;
}
}
}
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