java swing 自定义组件

我想设计一个这个组件，一个panel，里面3个label。
写了段代码，可是执行不出来。（本人新手），求各位指点一二。
[code="java"]
/*

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

package mytext;

/**实现新的组件
*

• @author Administrator
  */
  public class NewComp {
  private javax.swing.JLabel jLabel1;
  private javax.swing.JLabel jLabel2;
  private javax.swing.JLabel jLabel3;
  private javax.swing.JPanel jPanel1;
  public NewComp(){
  jPanel1 = new javax.swing.JPanel();
  jLabel2 = new javax.swing.JLabel();
  jLabel3 = new javax.swing.JLabel();
  jLabel1 = new javax.swing.JLabel();

  jPanel1.setName("jPanel1"); // NOI18N
  jPanel1.addMouseListener(new java.awt.event.MouseAdapter() {
      public void mouseClicked(java.awt.event.MouseEvent evt) {
  
      }
  });
  
  org.jdesktop.application.ResourceMap resourceMap = org.jdesktop.application.Application.getInstance(mytext.MyTextApp.class).getContext().getResourceMap(MyTextView.class);
  jLabel2.setText(resourceMap.getString("jLabel2.text")); // NOI18N
  jLabel2.setName("jLabel2"); // NOI18N
  
  jLabel3.setText(resourceMap.getString("jLabel3.text")); // NOI18N
  jLabel3.setName("jLabel3"); // NOI18N
  
  jLabel1.setText(resourceMap.getString("jLabel1.text")); // NOI18N
  jLabel1.setName("jLabel1"); // NOI18N
  
  javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
  jPanel1.setLayout(jPanel1Layout);
  jPanel1Layout.setHorizontalGroup(
      jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
      .addGroup(jPanel1Layout.createSequentialGroup()
          .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
              .addComponent(jLabel2, javax.swing.GroupLayout.DEFAULT_SIZE, 106, Short.MAX_VALUE)
              .addComponent(jLabel3, javax.swing.GroupLayout.DEFAULT_SIZE, 106, Short.MAX_VALUE)
              .addComponent(jLabel1, javax.swing.GroupLayout.DEFAULT_SIZE, 106, Short.MAX_VALUE))
          .addContainerGap())
  );
  jPanel1Layout.setVerticalGroup(
      jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
      .addGroup(jPanel1Layout.createSequentialGroup()
          .addComponent(jLabel1)
          .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
          .addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 15, javax.swing.GroupLayout.PREFERRED_SIZE)
          .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
          .addComponent(jLabel3))
  );
  

  }

}

[/code]

你图片上的布局方式可以用GridLayout实现，GridLayout就是网格布局，网格设为3行1列，就可以了，代码如下：
[code="java"]
MyComp mc = new MyComp();
mc.setLayout(new GridLayout(3, 1));
[/code]

自定义组件必须要从JComponet继承或其子类继承，比如你可以直接从JPanel继承
[code="java"]
public class MyComp extends JPanel {
private JLabel lbl1 = new JLabel("text1");
private JLabel lbl2 = new JLabel("text2");
private JLabel lbl3 = new JLabel("text3");

public MyComp() {
    this.add(lbl1);
    this.add(lbl2);
    this.add(lbl3);
}

}
[/code]