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Java Swing - 如何向JDialog添加组件

jdialog 【jdialog】
我们想知道如何向JDialog添加组件。
代码展示 运行结果 
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.Label;

import javax.swing.JDialog;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.SwingConstants;

public class Main {

  private JDialog dialog = new JDialog();
  private String colorNames[] = { "Red: ", "Green: ", "Blue: " };
  private Label labels[] = new Label[3];
  private JSlider slider[] = new JSlider[3];
  private Label lb;

  public Main() {
    JPanel sliderPanel = new JPanel();
    sliderPanel.setLayout(new GridLayout(0, 1));
    for (int i = 0; i < slider.length; i++) {
      labels[i] = new Label(colorNames[i] + 255);
      sliderPanel.add(labels[i]);
      slider[i] = new JSlider(SwingConstants.HORIZONTAL, 0, 255, 255);
      slider[i].setMinorTickSpacing(10);
      slider[i].setMajorTickSpacing(50);
      slider[i].setPaintTicks(true);
      slider[i].setPaintLabels(true);
      sliderPanel.add(slider[i]);
    }
    lb = new Label("Colour");
    dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
    dialog.setModal(true);
    dialog.add(sliderPanel, BorderLayout.CENTER);
    dialog.add(lb, BorderLayout.SOUTH);
    dialog.pack();
    dialog.setLocation(200, 200);
    dialog.setTitle("Colour Dialog");
    dialog.setVisible(true);
  }

  public static void main(String args[]) {
    Main colourDialog = new Main();
  }
}