java入門：「メイン型が含まれていません」とはどういうことですか？

「こちら」を参考に製作しています。

「メイン型が含まれていません」とはどういうことですか？

Eclipseを少しいじってしまいました。
それが原因ですか？

ソースです

java
1/**
2 * Example of components laid out in a grid
3 */
4public class BasicSwingComponents extends javax.swing.JFrame{
5  private javax.swing.JButton ivjJButton1 = null;
6  private javax.swing.JCheckBox ivjJCheckBox1 = null;
7  private javax.swing.JComboBox ivjJComboBox1 = null;
8  private javax.swing.JPanel ivjJFrameContentPane = null;
9  private javax.swing.JLabel ivjJLabel1 = null;
10  private javax.swing.JPasswordField ivjJPasswordField1 = null;
11  private javax.swing.JProgressBar ivjJProgressBar1 = null;
12  private javax.swing.JRadioButton ivjJRadioButton1 = null;
13  private javax.swing.JScrollBar ivjJScrollBar1 = null;
14  private javax.swing.JSlider ivjJSlider1 = null;
15  private javax.swing.JTextArea ivjJTextArea1 = null;
16  private javax.swing.JTextField ivjJTextField1 = null;
17  private javax.swing.JToggleButton ivjJToggleButton1 = null;
18public BasicSwingComponents() {
19  super();
20  initialize();
21}
22/**
23 * Return the JButton1 property value.
24 * @return javax.swing.JButton
25 */
26private javax.swing.JButton getJButton1() {
27  if ( ivjJButton1 == null ) {
28    ivjJButton1 = new javax.swing.JButton();
29    ivjJButton1.setName("JButton1");
30    ivjJButton1.setText("JButton");
31  }
32  return ivjJButton1;
33}
34/**
35 * Return the JCheckBox1 property value.
36 * @return javax.swing.JCheckBox
37 */
38private javax.swing.JCheckBox getJCheckBox1() {
39  if (ivjJCheckBox1 == null) {
40    ivjJCheckBox1 = new javax.swing.JCheckBox();
41    ivjJCheckBox1.setName("JCheckBox1");
42    ivjJCheckBox1.setText("JCheckBox");
43  }
44  return ivjJCheckBox1;
45}
46/**
47 * Return the JComboBox1 property value.
48 * @return javax.swing.JComboBox
49 */
50private javax.swing.JComboBox getJComboBox1() {
51  if (ivjJComboBox1 == null) {
52    ivjJComboBox1 = new javax.swing.JComboBox();
53    ivjJComboBox1.setName("JComboBox1");
54  }
55  return ivjJComboBox1;
56}
57/**
58 * Return the JFrameContentPane property value.
59 * @return javax.swing.JPanel
60 */
61private javax.swing.JPanel getJFrameContentPane() {
62  if (ivjJFrameContentPane == null) {
63    ivjJFrameContentPane = new javax.swing.JPanel();
64    ivjJFrameContentPane.setName("JFrameContentPane");
65    ivjJFrameContentPane.setLayout(new java.awt.FlowLayout());
66    getJFrameContentPane().add(getJButton1(), getJButton1().getName());
67    getJFrameContentPane().add(getJCheckBox1(), getJCheckBox1().getName());
68    getJFrameContentPane().add(getJRadioButton1(), getJRadioButton1().getName());
69    getJFrameContentPane().add(getJToggleButton1(), getJToggleButton1().getName());
70    getJFrameContentPane().add(getJLabel1(), getJLabel1().getName());
71    getJFrameContentPane().add(getJTextField1(), getJTextField1().getName());
72    getJFrameContentPane().add(getJPasswordField1(), getJPasswordField1().getName());
73    getJFrameContentPane().add(getJTextArea1(), getJTextArea1().getName());
74    getJFrameContentPane().add(getJSlider1(), getJSlider1().getName());
75    getJFrameContentPane().add(getJScrollBar1(), getJScrollBar1().getName());
76    getJFrameContentPane().add(getJComboBox1(), getJComboBox1().getName());
77    getJFrameContentPane().add(getJProgressBar1(), getJProgressBar1().getName());
78  }
79  return ivjJFrameContentPane;
80}
81/**
82 * Return the JLabel1 property value.
83 * @return javax.swing.JLabel
84 */
85private javax.swing.JLabel getJLabel1() {
86  if (ivjJLabel1 == null) {
87    ivjJLabel1 = new javax.swing.JLabel();
88    ivjJLabel1.setName("JLabel1");
89    ivjJLabel1.setText("JLabel");
90  }
91  return ivjJLabel1;
92}
93/**
94 * Return the JPasswordField1 property value.
95 * @return javax.swing.JPasswordField
96 */
97
98private javax.swing.JPasswordField getJPasswordField1() {
99  if (ivjJPasswordField1 == null) {
100    ivjJPasswordField1 = new javax.swing.JPasswordField();
101    ivjJPasswordField1.setName("JPasswordField1");
102  }
103  return ivjJPasswordField1;
104}
105/**
106 * Return the JProgressBar1 property value.
107 * @return javax.swing.JProgressBar
108 */
109private javax.swing.JProgressBar getJProgressBar1() {
110  if (ivjJProgressBar1 == null) {
111    ivjJProgressBar1 = new javax.swing.JProgressBar();
112    ivjJProgressBar1.setName("JProgressBar1");
113    ivjJProgressBar1.setValue(50);
114  }
115  return ivjJProgressBar1;
116}
117/**
118 * Return the JRadioButton1 property value.
119 * @return javax.swing.JRadioButton
120 */
121private javax.swing.JRadioButton getJRadioButton1() {
122  if (ivjJRadioButton1 == null) {
123    ivjJRadioButton1 = new javax.swing.JRadioButton();
124    ivjJRadioButton1.setName("JRadioButton1");
125    ivjJRadioButton1.setText("JRadioButton");
126  }
127  return ivjJRadioButton1;
128}
129/**
130 * Return the JScrollBar1 property value.
131 * @return javax.swing.JScrollBar
132 */
133private javax.swing.JScrollBar getJScrollBar1() {
134  if (ivjJScrollBar1 == null) {
135    ivjJScrollBar1 = new javax.swing.JScrollBar();
136    ivjJScrollBar1.setName("JScrollBar1");
137  }
138  return ivjJScrollBar1;
139}
140/**
141 * Return the JSlider1 property value.
142 * @return javax.swing.JSlider
143 */
144private javax.swing.JSlider getJSlider1() {
145  if (ivjJSlider1 == null) {
146    ivjJSlider1 = new javax.swing.JSlider();
147    ivjJSlider1.setName("JSlider1");
148  }
149  return ivjJSlider1;
150}
151/**
152 * Return the JTextArea1 property value.
153 * @return javax.swing.JTextArea
154 */
155private javax.swing.JTextArea getJTextArea1() {
156  if (ivjJTextArea1 == null) {
157    ivjJTextArea1 = new javax.swing.JTextArea();
158    ivjJTextArea1.setName("JTextArea1");
159    ivjJTextArea1.setRows(3);
160    ivjJTextArea1.setColumns(7);
161  }
162  return ivjJTextArea1;
163}
164/**
165 * Return the JTextField1 property value.
166 * @return javax.swing.JTextField
167 */
168private javax.swing.JTextField getJTextField1() {
169  if (ivjJTextField1 == null) {
170    ivjJTextField1 = new javax.swing.JTextField();
171    ivjJTextField1.setName("JTextField1");
172    ivjJTextField1.setText("JTextField");
173  }
174  return ivjJTextField1;
175}
176/**
177 * Return the JToggleButton1 property value.
178 * @return javax.swing.JToggleButton
179 */
180private javax.swing.JToggleButton getJToggleButton1() {
181  if (ivjJToggleButton1 == null) {
182    ivjJToggleButton1 = new javax.swing.JToggleButton();
183    ivjJToggleButton1.setName("JToggleButton1");
184    ivjJToggleButton1.setText("JToggleButton");
185  }
186  return ivjJToggleButton1;
187}
188/**
189 * Initialize the class.
190 */
191private void initialize() {
192
193  this.setName("JFrame1");
194  this.setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
195  this.setBounds(45, 25, 317, 273);
196  this.setTitle("BasicSwingComponents");
197  this.setContentPane(getJFrameContentPane());
198
199}
200
201public static void main(String argv[])  {
202  BasicSwingComponents instance = new BasicSwingComponents();
203  instance.initialize();
204  instance.setVisible(true);
205}
206}