Java IllegalArgumentException将窗口添加到容器。_Java_Swing_Swingutilities

Java IllegalArgumentException将窗口添加到容器。

java swing

Java IllegalArgumentException将窗口添加到容器。,java,swing,swingutilities,Java,Swing,Swingutilities,我不熟悉Java swing。当从主类调用Jframe时，我确实遇到了问题。它可能是重复的，但我无法找出我的代码不工作的原因。所以我在这里发帖主类 public static void main(String[] args) { // TODO code application logic here SwingUtilities.invokeLater(new Runnable() { @Override public void run() {

我不熟悉Java swing。当从主类调用Jframe时，我确实遇到了问题。它可能是重复的，但我无法找出我的代码不工作的原因。所以我在这里发帖

主类

public static void main(String[] args) {
    // TODO code application logic here
    SwingUtilities.invokeLater(new Runnable() {

        @Override
        public void run() {
            SendMail sendMail = new SendMail();
            JFrame frame = new JFrame();                                
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.add(sendMail,BorderLayout.CENTER);
            frame.pack();
            frame.setVisible(true);
        }
    });

}

JFrame

public class SendMail extends javax.swing.JFrame {

/**
 * Creates new form SendMail
 */
public SendMail() {
    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.
 */
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          
private void initComponents() {

    jFileChooser1 = new javax.swing.JFileChooser();
    jFileChooser2 = new javax.swing.JFileChooser();
    jButton2 = new javax.swing.JButton();
    jPanel1 = new javax.swing.JPanel();
    to = new javax.swing.JTextField();
    toLabel = new javax.swing.JLabel();
    toCc = new javax.swing.JLabel();
    toBcc = new javax.swing.JLabel();
    cc = new javax.swing.JTextField();
    bcc = new javax.swing.JTextField();
    jPanel2 = new javax.swing.JPanel();
    jScrollPane1 = new javax.swing.JScrollPane();
    jTextArea1 = new javax.swing.JTextArea();
    sendButton = new javax.swing.JButton();
    fileName = new javax.swing.JTextField();
    attach = new javax.swing.JButton();

    jButton2.setText("jButton2");

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    to.setText("TO");
    to.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            toActionPerformed(evt);
        }
    });

    toLabel.setText("TO  ");

    toCc.setText("CC");

    toBcc.setText("BCC");

    cc.setText("CC");
    cc.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            ccActionPerformed(evt);
        }
    });

    bcc.setText("BCC");

    javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
    jPanel1.setLayout(jPanel1Layout);
    jPanel1Layout.setHorizontalGroup(
        jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jPanel1Layout.createSequentialGroup()
            .addContainerGap()
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                .addComponent(toBcc, javax.swing.GroupLayout.DEFAULT_SIZE, 142, Short.MAX_VALUE)
                .addComponent(toCc, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(toLabel, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                .addComponent(to)
                .addComponent(cc)
                .addComponent(bcc, javax.swing.GroupLayout.DEFAULT_SIZE, 199, Short.MAX_VALUE))
            .addContainerGap())
    );
    jPanel1Layout.setVerticalGroup(
        jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jPanel1Layout.createSequentialGroup()
            .addContainerGap()
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(to, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(toLabel))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(toCc)
                .addComponent(cc, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(toBcc)
                .addComponent(bcc, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addContainerGap(20, Short.MAX_VALUE))
    );

    jTextArea1.setColumns(20);
    jTextArea1.setRows(5);
    jScrollPane1.setViewportView(jTextArea1);

    sendButton.setText("Send");
    sendButton.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            sendButtonActionPerformed(evt);
        }
    });

    attach.setText("Attach");
    attach.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            attachActionPerformed(evt);
        }
    });

    javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
    jPanel2.setLayout(jPanel2Layout);
    jPanel2Layout.setHorizontalGroup(
        jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(jPanel2Layout.createSequentialGroup()
            .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 244, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(sendButton, javax.swing.GroupLayout.DEFAULT_SIZE, 150, Short.MAX_VALUE)
                .addGroup(jPanel2Layout.createSequentialGroup()
                    .addComponent(fileName)
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                    .addComponent(attach, javax.swing.GroupLayout.PREFERRED_SIZE, 27, javax.swing.GroupLayout.PREFERRED_SIZE))))
    );
    jPanel2Layout.setVerticalGroup(
        jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 197, Short.MAX_VALUE)
        .addGroup(jPanel2Layout.createSequentialGroup()
            .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(fileName, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(attach))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
            .addComponent(sendButton))
    );

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        .addComponent(jPanel2, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
            .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap())
    );

    pack();
}// </editor-fold>

公共类SendMail扩展了javax.swing.JFrame{
/**
*创建新表单SendMail
*/
公共发送邮件（）{
初始化组件（）；
}
/**
*从构造函数中调用此方法来初始化表单。
*警告：不要修改此代码。此方法的内容始终为
*由表单编辑器重新生成。
*/
@抑制警告（“未选中”）
//                           
私有组件（）{
jFileChooser1=newjavax.swing.JFileChooser（）；
jFileChooser2=newjavax.swing.JFileChooser（）；
jButton2=newjavax.swing.JButton（）；
jPanel1=newjavax.swing.JPanel（）；
to=newjavax.swing.JTextField（）；
toLabel=newjavax.swing.JLabel（）；
toCc=newjavax.swing.JLabel（）；
toBcc=newjavax.swing.JLabel（）；
cc=newjavax.swing.JTextField（）；
bcc=newjavax.swing.JTextField（）；
jPanel2=newjavax.swing.JPanel（）；
jScrollPane1=newjavax.swing.JScrollPane（）；
jTextArea1=newjavax.swing.JTextArea（）；
sendButton=newjavax.swing.JButton（）；
fileName=newjavax.swing.JTextField（）；
attach=newjavax.swing.JButton（）；
setText（“jButton2”）；
setDefaultCloseOperation（javax.swing.WindowConstants.EXIT_ON_CLOSE）；
to.setText（“to”）；
to.addActionListener（新java.awt.event.ActionListener（）{
public void actionPerformed（java.awt.event.ActionEvent evt）{
执行的操作（evt）；
}
});
toLabel.setText（“TO”）；
toCc.setText（“CC”）；
toBcc.setText（“密件抄送”）；
抄送：setText（“抄送”）；
cc.addActionListener（新java.awt.event.ActionListener（）{
public void actionPerformed（java.awt.event.ActionEvent evt）{
执行的操作（evt）；
}
});
密件抄送：密件抄送（“密件抄送”）；
javax.swing.GroupLayout jPanel1Layout=新的javax.swing.GroupLayout（jPanel1）；
setLayout（jPanel1Layout）；
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addGroup（jpanellayout.createSequentialGroup（）
.addContainerGap（）
.addGroup（jPanel1Layout.createParallelGroup（javax.swing.GroupLayout.Alignment.TRAILING，false）
.addComponent（toBcc，javax.swing.GroupLayout.DEFAULT\u SIZE，142，Short.MAX\u值）
.addComponent（toCc，javax.swing.GroupLayout.DEFAULT\u SIZE，javax.swing.GroupLayout.DEFAULT\u SIZE，Short.MAX\u值）
.addComponent（toLabel，javax.swing.GroupLayout.DEFAULT\u SIZE，javax.swing.GroupLayout.DEFAULT\u SIZE，Short.MAX\u VALUE））
.addPreferredGap（javax.swing.LayoutStyle.ComponentPlacement.RELATED，javax.swing.GroupLayout.DEFAULT\u SIZE，Short.MAX\u值）
.addGroup（jPanel1Layout.createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING，false）
.addComponent（to）
.addComponent（cc）
.addComponent（bcc，javax.swing.GroupLayout.DEFAULT_SIZE，199，Short.MAX_VALUE））
.addContainerGap（））
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addGroup（jpanellayout.createSequentialGroup（）
.addContainerGap（）
.addGroup（jPanel1Layout.createParallelGroup（javax.swing.GroupLayout.Alignment.BASELINE）
.addComponent（to，javax.swing.GroupLayout.PREFERRED\u SIZE，javax.swing.GroupLayout.DEFAULT\u SIZE，javax.swing.GroupLayout.PREFERRED\u SIZE）
.addComponent（toLabel））
.addPreferredGap（javax.swing.LayoutStyle.ComponentPlacement.RELATED）
.addGroup（jPanel1Layout.createParallelGroup（javax.swing.GroupLayout.Alignment.BASELINE）
.addComponent（toCc）
.addComponent（cc，javax.swing.GroupLayout.PREFERRED\u SIZE，javax.swing.GroupLayout.DEFAULT\u SIZE，javax.swing.GroupLayout.PREFERRED\u SIZE））
.addPreferredGap（javax.swing.LayoutStyle.ComponentPlacement.RELATED）
.addGroup（jPanel1Layout.createParallelGroup（javax.swing.GroupLayout.Alignment.BASELINE）
.addComponent（toBcc）
.addComponent（bcc，javax.swing.GroupLayout.PREFERRED\u SIZE，javax.swing.GroupLayout.DEFAULT\u SIZE，javax.swing.GroupLayout.PREFERRED\u SIZE））
.addContainerGap（20，简称最大值））
);
jTextArea1.设置列（20）；
jTextArea1.设置行（5）；
jScrollPane1.setViewportView（jTextArea1）；
sendButton.setText（“发送”）；
sendButton.addActionListener（新的java.awt.event.ActionListener（）{
public void actionPerformed（java.awt.event.ActionEvent evt）{
执行发送按钮操作（evt）；
}
});
附件。setText（“附件”）；
attach.addActionListener（新java.awt.event.ActionListener（）{
public void actionPerformed（java.awt.event.ActionEvent evt）{
执行的附加操作（evt）；
}
});
javax.swing.GroupLayout jPanel2Layout=新的javax.swing.GroupLayout（jPanel2）；
设置布局（jPanel2布局）；
jPanel2Layout.setHorizontalGroup(
jPanel2Layout.createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addGroup（jPanel2Layout.createSequentialGroup（）
.addComponent（jScrollPane1，javax.swing.GroupLayout.PREFERRED_SIZE，244，javax.swing.GroupLayout.PREFERRED_SIZE）
.addPreferredGap（javax.swing.LayoutStyle.ComponentPlacement.RELATED）
.addGroup（jPanel2Layout.createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addComponent（sendButton，javax.swing.GroupLayout.DEFAULT\u SIZE，150，Short.MAX\u值）
.addGroup（jPanel2Layout.createSequentialGroup（）
.addComponent（文件名）
.addPreferredGap（javax.swing.LayoutStyle.ComponentPl
public class SendMail extends javax.swing.JFrame

public class SendMail extends javax.swing.JPanel