Java在运行时动态添加复选框

Question

我的项目将显示for循环的复选框。我的问题是，我有我的JFrame，每次运行它时，复选框都在另一个窗口中。我想要的是在我的JFrame上显示它。任何对我的问题有所了解的人？

屏幕截图：http://i.imgur.com/EuTFWkp.png

这是我动态添加复选框的代码：

    String title = (args.length == 0 ? "CheckBox Sample" : args[0]);
    JFrame frame = new JFrame(title);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JPanel panel = new JPanel(new GridLayout(0, 1));
    Border border = BorderFactory.createTitledBorder("Test");
    panel.setBorder(border);

    javax.swing.JCheckBox[] jCheckboxArray;

    int CheckBoxNumber = 5;
    jCheckboxArray = new javax.swing.JCheckBox[CheckBoxNumber];
    for(int x = 0; x < CheckBoxNumber ; x++) {
        jCheckboxArray[x] = new javax.swing.JCheckBox();
        jCheckboxArray[x].setText("CheckBox " + x);
        panel.add(jCheckboxArray[x]);
    }

    Container contentPane = frame.getContentPane();
    contentPane.add(panel, BorderLayout.CENTER);
    //contentPane.add(button, BorderLayout.SOUTH);
    frame.setSize(300, 200);
    frame.setVisible(true);

这是我的完整代码：

package Employees;

import java.awt.BorderLayout;
import java.awt.Checkbox;
import java.awt.Container;
import java.awt.GridLayout;
import java.util.List;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.ResultSet;
import java.util.ArrayList;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import javax.swing.border.Border;


public class Workers extends javax.swing.JFrame {
Connection con;
Statement stmt;
ResultSet rs;

    public Workers() {
        initComponents();
        DoConnect();
    }
    public void DoConnect(){
        try{
            String host = "jdbc:derby://localhost:1527/Employees";
            String uName = "cepe";
            String uPass = "admin";
            con = DriverManager.getConnection(host, uName, uPass);

            stmt = con.createStatement( ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE );
            String sql = "SELECT * FROM Workers";
            rs = stmt.executeQuery(sql);

            rs.next();
            int id_col = rs.getInt("ID");
            String id = Integer.toString(id_col);
            String first = rs.getString("First_Name");
            String last = rs.getString("Last_Name");
            String job = rs.getString("Job_Title");

            textID.setText(id);
            textFirstName.setText(first);
            textLastName.setText(last);
            textJobTitle.setText(job);
        }
        catch(SQLException err){
            JOptionPane.showMessageDialog(Workers.this, err.getMessage());
        }
    }

    /**
     * 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() {

        jPanel1 = new javax.swing.JPanel();
        textID = new javax.swing.JTextField();
        textFirstName = new javax.swing.JTextField();
        textLastName = new javax.swing.JTextField();
        textJobTitle = new javax.swing.JTextField();
        jLabel1 = new javax.swing.JLabel();
        jButton1 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();
        jButton3 = new javax.swing.JButton();
        jButton4 = new javax.swing.JButton();
        jPanel2 = new javax.swing.JPanel();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jLabel1.setText("Job Title:");

        jButton1.setText("First");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        jButton2.setText("Previous");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });

        jButton3.setText("Next");
        jButton3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton3ActionPerformed(evt);
            }
        });

        jButton4.setText("Last");
        jButton4.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton4ActionPerformed(evt);
            }
        });

        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)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                            .addComponent(jLabel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                            .addComponent(textID))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(jPanel1Layout.createSequentialGroup()
                                .addComponent(textFirstName, javax.swing.GroupLayout.PREFERRED_SIZE, 134, javax.swing.GroupLayout.PREFERRED_SIZE)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(textLastName))
                            .addComponent(textJobTitle)))
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGap(33, 33, 33)
                        .addComponent(jButton1)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(jButton2)
                        .addGap(18, 18, 18)
                        .addComponent(jButton3)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(jButton4)
                        .addGap(0, 23, Short.MAX_VALUE)))
                .addContainerGap())
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                    .addComponent(textLastName, javax.swing.GroupLayout.DEFAULT_SIZE, 32, Short.MAX_VALUE)
                    .addComponent(textFirstName)
                    .addComponent(textID))
                .addGap(18, 18, 18)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(textJobTitle, javax.swing.GroupLayout.PREFERRED_SIZE, 33, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel1))
                .addGap(18, 18, 18)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jButton1)
                    .addComponent(jButton2)
                    .addComponent(jButton3)
                    .addComponent(jButton4))
                .addGap(0, 13, Short.MAX_VALUE))
        );

        javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
        jPanel2.setLayout(jPanel2Layout);
        jPanel2Layout.setHorizontalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 100, Short.MAX_VALUE)
        );
        jPanel2Layout.setVerticalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGap(0, 100, Short.MAX_VALUE)
        );

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addGap(0, 0, Short.MAX_VALUE)))
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(46, Short.MAX_VALUE))
        );

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

    private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        try{
            if(rs.next()){
                int id_col = rs.getInt("ID");
                String id = Integer.toString(id_col);
                String first = rs.getString("First_Name");
                String last = rs.getString("Last_Name");
                String job = rs.getString("Job_Title");

                textID.setText(id);
                textFirstName.setText(first);
                textLastName.setText(last);
                textJobTitle.setText(job);
            }
            else{
                rs.previous();
                JOptionPane.showMessageDialog(Workers.this, "End of File");
            }
        }
        catch(SQLException err){
            JOptionPane.showMessageDialog(Workers.this, err.getMessage());
        }
    }                                        

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        try{
            if(rs.previous()){
                int id_col = rs.getInt("ID");
                String id = Integer.toString(id_col);
                String first = rs.getString("First_Name");
                String last = rs.getString("Last_Name");
                String job = rs.getString("Job_Title");

                textID.setText(id);
                textFirstName.setText(first);
                textLastName.setText(last);
                textJobTitle.setText(job);
            }
            else{
                rs.next();
                JOptionPane.showMessageDialog(Workers.this, "End of File");
            }
        }
        catch(SQLException err){
            JOptionPane.showMessageDialog(Workers.this, err.getMessage());
        }
    }                                        

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        try{
            rs.first();
            int id_col = rs.getInt("ID");
            String id = Integer.toString(id_col);
            String first = rs.getString("First_Name");
            String last = rs.getString("Last_Name");
            String job = rs.getString("Job_Title");

            textID.setText(id);
            textFirstName.setText(first);
            textLastName.setText(last);
            textJobTitle.setText(job);
        }
        catch(SQLException err){
            JOptionPane.showMessageDialog(Workers.this, err.getMessage());
        }
    }                                        

    private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        try{
            rs.last();
            int id_col = rs.getInt("ID");
            String id = Integer.toString(id_col);
            String first = rs.getString("First_Name");
            String last = rs.getString("Last_Name");
            String job = rs.getString("Job_Title");

            textID.setText(id);
            textFirstName.setText(first);
            textLastName.setText(last);
            textJobTitle.setText(job);
        }
        catch(SQLException err){
            JOptionPane.showMessageDialog(Workers.this, err.getMessage());
        }
    }                                        

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Workers().setVisible(true);
            }
        });

            String title = (args.length == 0 ? "CheckBox Sample" : args[0]);
            JFrame frame = new JFrame(title);
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            JPanel panel = new JPanel(new GridLayout(0, 1));
            Border border = BorderFactory.createTitledBorder("Test");
            panel.setBorder(border);

            javax.swing.JCheckBox[] jCheckboxArray;

            int CheckBoxNumber = 5;
            jCheckboxArray = new javax.swing.JCheckBox[CheckBoxNumber];
            for(int x = 0; x < CheckBoxNumber ; x++) {
                jCheckboxArray[x] = new javax.swing.JCheckBox();
                jCheckboxArray[x].setText("CheckBox " + x);
                panel.add(jCheckboxArray[x]);
            }

            Container contentPane = frame.getContentPane();
            contentPane.add(panel, BorderLayout.CENTER);
            //contentPane.add(button, BorderLayout.SOUTH);
            frame.setSize(300, 200);
            frame.setVisible(true);
    }

    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JButton jButton3;
    private javax.swing.JButton jButton4;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JPanel jPanel2;
    private javax.swing.JTextField textFirstName;
    private javax.swing.JTextField textID;
    private javax.swing.JTextField textJobTitle;
    private javax.swing.JTextField textLastName;
    // End of variables declaration                   
}

Answer 1

代码按预期工作。 您的代码中有两个框架：Workers（扩展JFrame）是在main方法的第一个语句（第3行）中创建的，以及您在主要文件中直接创建的框架方法名称只是frame。 它们都在程序启动时显示。

您可能希望将带有复选框的面板添加到Workers框架。你可以在Workers构造函数中执行此操作，在initComponents()自己的代码之后放置，记住您正在操作的框架是this特殊变量（不要创建另一个框架） ）。 您还需要考虑该框架上现有的组件，以使其看起来很好，移动代码最有可能赢得不够。