当我在Netbeans中选择“运行”时，我的GUI没有显示，它只是在屏幕底部显示一个框，上面写着“构建成功”。

/*
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 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

package modelrange;

import javax.swing.DefaultBoundedRangeModel;

public class RangedModel extends javax.swing.JPanel {

    DefaultBoundedRangeModel myModel;

    public static void main(String[] args) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new RangedModel().setVisible(true);
            }
       });
    }

    /**
     * Creates new form RangedModel
     */
    public RangedModel() {
        myModel = new DefaultBoundedRangeModel(123, 100, 0, 1000);
        initComponents();
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */

    private void initComponents() { 
    This is just the automated netbeans code from the GUI builder (edited out for the post)            
    }