动态创建jCheckBox并添加到jScrollPane [英] Dynamically create jCheckBox and add to a jScrollPane

查看：806 发布时间：2017/7/22 12:37:16 java swing dynamic jscrollpane jcheckbox

本文介绍了动态创建jCheckBox并添加到jScrollPane的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

编辑：使用下面介绍的解决方案，我已经将代码更改为在JScrollPane中有一个JPanel。使用JButton我将JCheckBoxes添加到JScrollPane内的JPanel中。这是一个解决的问题，因为JScrollPanecan只需要一个JComponent。其余的问题已经解决了将Gridlayout设置为JScrollPane内的JPanel。我已经把这个原来的问题留在了后代：

ORIGINAL QUESTION：我试图动态创建JCheckBox并将它们添加到JScrollPane中，但是我可以几乎没有成功。我已将其简化为一个概念验证实现。

我在JFrame内有一个JScrollPaneon一个JPanel。另外在JPanel上，我添加了一个按钮，它应该在JScrollPane中添加一个JCheckBox。应该够简单按钮中的代码如下：

  private void addCheckBoxActionPerformed（java.awt.event.ActionEvent evt）{
 
 JCheckBox cb = new JCheckBox（New CheckBox）; 
 
 jScrollPaneCheckBoxes.add（cb）; 
 jScrollPaneCheckBoxes.revalidate（）; 
}

代码运行似乎没有错误。我没有例外，使用调试器显示JCheckBox实际上已经添加到JScrollPane。不幸的是，应用程序中没有显示任何内容我需要向哪里寻找问题的方向。

这是一个快速的代码，你可以运行。不幸的是，我使用Netbeans和它的GUI设计器一起投入使用，因此它比它需要的时间要长一些，特别是生成的代码。专注于方法jButton1ActionPerformed，这就是上面的代码取自的地方。

编辑：这段代码现在完成了我所需要的。： - ）

  package dynamiccheckboxsscce; 
 
 import javax.swing.JCheckBox; 
 
 public class Main extends javax.swing.JFrame {
 
 / ** 
 *创建新窗体Main 
 * / 
 public Main （）{
 initComponents（）; 
 
 
 @SuppressWarnings（unchecked）
 private void initComponents（）{
 
 jScrollPane1 = new javax.swing.JScrollPane（）; 
 jPanel1 = new javax.swing.JPanel（）; 
 jButton1 = new javax.swing.JButton（）; 
 
 setDefaultCloseOperation（javax.swing.WindowConstants.EXIT_ON_CLOSE）; 
 
 jScrollPane1.setHorizontalScrollBarPolicy（javax.swing.ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER）; 
 jScrollPane1.setPreferredSize（new java.awt.Dimension（250，250））; 
 
 jPanel1.setPreferredSize（new java.awt.Dimension（300，250））; 
 jPanel1.setLayout（new java.awt.GridLayout（0，2，10，10））; 
 jScrollPane1.setViewportView（jPanel1）; 
 
 jButton1.setText（添加复选框）; 
 jButton1.addActionListener（new java.awt.event.ActionListener（）{
 public void actionPerformed（java.awt.event.ActionEvent evt）{
 jButton1ActionPerformed（evt）; 
 } 
}）; 
 
 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）
 .addGroup（layout.createSequentialGroup（）
 .addComponent（jScrollPane1，javax.swing.GroupLayout.DEFAULT_SIZE，309，Short。 MAX_VALUE）
 .addContainerGap（））
 .addGroup（javax.swing.GroupLayout.Alignment.TRAILING，layout.createSequentialGroup（）
 .addGap（0，0，Short.MAX_VALUE）
 .addComponent（jButton1）
 .addGap（112,112,112）））））; 
 layout.setVerticalGroup（
 layout.createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
 .addGroup（javax.swing.GroupLayout.Alignment.TRAILING，layout.createSequentialGroup（）
 .addContainerGap（）
 .addComponent（jScrollPane1，javax.swing.GroupLayout.DEFAULT_SIZE，javax.swing.GroupLayout.DEFAULT_SIZE，Short.MAX_VALUE）
 .addPreferredGap（javax.swing.LayoutStyle.ComponentPlacement。相关，11，Short.MAX_VALUE）
 .addComponent（jButton1）
 .addContainerGap（）））; 
 
 pack（）; 
} 
 
 private void jButton1ActionPerformed（java.awt.event.ActionEvent evt）{
 JCheckBox cb = new JCheckBox（New CheckBox）; 
 
 jPanel1.add（cb）; 
 jPanel1.revalidate（）; 
 jPanel1.repaint（）; 
} 
 
 / ** 
 * @param args命令行参数
 * / 
 public static void main（String args []）{
 / * 
 *设置Nimbus外观和感觉
 * / 
尝试{
 for（javax.swing.UIManager.LookAndFeelInfo info：javax.swing.UIManager.getInstalledLookAndFeels （））{
 if（Nimbus.equals（info.getName（）））{
 javax.swing.UIManager.setLookAndFeel（info.getClassName（））; 
 break; 
} 
} 
} catch（ClassNotFoundException ex）{
 java.util.logging.Logger.getLogger（Main.class.getName（））。log（java.util。 logging.Level.SEVERE，null，ex）; 
} catch（InstantiationException ex）{
 java.util.logging.Logger.getLogger（Main.class.getName（））。log（java.util.logging.Level.SEVERE，null，ex） ; 
} catch（IllegalAccessException ex）{
 java.util.logging.Logger.getLogger（Main.class.getName（））。log（java.util.logging.Level.SEVERE，null，ex） ; 
} catch（javax.swing.UnsupportedLookAndFeelException ex）{
 java.util.logging.Logger.getLogger（Main.class.getName（））。log（java.util.logging.Level.SEVERE， null，ex）; 
} 
 
 / * 
 *创建并显示窗体
 * / 
 java.awt.EventQueue.invokeLater（new Runnable（）{
 public void run（）{
 new Main（）。setVisible（true）; 
} 
}）; 
} 
 private javax.swing.JButton jButton1; 
 private javax.swing.JPanel jPanel1; 
 private javax.swing.JScrollPane jScrollPane1; 
}

提前感谢。

解决方案

不发布 SSCCE 你必须接受 JScrollPane 被指定只嵌套一个 JComponent ，

添加一个 JComponent 到 JScrollPane ，放在那里 JPanel ，然后添加一个新的 JComponent code> JPanel 而不是 JScrollPane

a href =https://stackoverflow.com/a/6989230/714968>如何动态添加/删除JComponents

编辑

您必须将适当的LayoutManager设置为JPanel

你要添加JPanel到JScrollPane

（没有使用built_in设计器，甚至安全的时间...，需要关于使用SwingFramework和Swing的最佳知识，我是满足普通的秋千）

代码

  import java.awt.BorderLayout; 
 import java.awt.GridLayout; 
 import javax.swing.JButton; 
 import javax.swing.JCheckBox; 
 import javax.swing.JFrame; 
 import javax.swing.JPanel; 
 import javax.swing.JScrollPane; 
 
 public class AddJCheckBoxToJScrollPane {
 
 private static final long serialVersionUID = 1L; 
 private JFrame frame = new JFrame（）; 
 private JButton jButton1; 
私人JPanel jPanel1; 
 private JScrollPane jScrollPane1; 
 
 public AddJCheckBoxToJScrollPane（）{
 jPanel1 = new JPanel（）; 
 jPanel1.setLayout（new GridLayout（0，2，10，10））; 
 jScrollPane1 = new JScrollPane（jPanel1）; 
 jButton1 = new JButton（Add Checkbox）; 
 jButton1.addActionListener（new java.awt.event.ActionListener（）{
 
 public void actionPerformed（java.awt.event.ActionEvent evt）{
 JCheckBox cb = new JCheckBox （New CheckBox）; 
 jPanel1.add（cb）; 
 jPanel1.revalidate（）; 
 jPanel1.repaint（）; 
} 
}）; 
 frame.add（jScrollPane1）; 
 frame.add（jButton1，BorderLayout.SOUTH）; 
 frame.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）; 
 frame.setSize（300，200）; 
 //frame.pack（）; 
 frame.setLocationRelativeTo（null）; 
 frame.setVisible（true）; 
} 
 
 public static void main（String args []）{
 
 try {
 for（javax.swing.UIManager.LookAndFeelInfo info：javax .swing.UIManager.getInstalledLookAndFeels（））{
 if（Nimbus.equals（info.getName（）））{
 javax.swing.UIManager.setLookAndFeel（info.getClassName（））; 
 break; 
} 
} 
} catch（ClassNotFoundException ex）{
} catch（InstantiationException ex）{
} catch（IllegalAccessException ex）{
} catch javax.swing.UnsupportedLookAndFeelException ex）{
} 
 java.awt.EventQueue.invokeLater（new Runnable（）{
 
 public void run（）{
 new AddJCheckBoxToJScrollPane （）; 
} 
}）; 
} 
}

EDIT: Using the solutions presented below, I have changed the code to have a JPanel inside a JScrollPane. Using a JButton i add JCheckBoxes to the JPanel inside the JScrollPane. This was one problem solved, as the a JScrollPanecan only take one JComponent. The rest of the issues were solved setting a gridlayout to the JPanel inside JScrollPane. I have kept my original question here for the sake of posterity:

ORIGINAL QUESTION: I'm trying to dynamically create JCheckBox and add them to a JScrollPane, but alas i am achieving little success. I have reduced this to a single proof-of-concept implementation.

I have a JScrollPaneon a JPanel inside a JFrame. Also on the JPanel, i have added a button that is supposed to add a JCheckBox to the JScrollPane when clicked. Should be simple enough. The code inside the button is as follows:

 private void addCheckBoxActionPerformed(java.awt.event.ActionEvent evt) {

    JCheckBox cb = new JCheckBox("New CheckBox");        

    jScrollPaneCheckBoxes.add(cb);
    jScrollPaneCheckBoxes.revalidate();
 }

The code runs seemingly without error. I have no exceptions and using the debugger shows that the JCheckBox is in fact added to the JScrollPane . Unfortunately, nothing is displayed in the application. I need direction as to where to look for the problem.

Here is a quick piece of code that you can just run. Unfortunately i threw this together using Netbeans and it's GUI designer and as such it's a bit longer than it needs to be, especially the generated code. Focus on the method jButton1ActionPerformed, that's where the above code is taken from.

EDIT: This code now does what i need it to. :-)

package dynamiccheckboxsscce;

import javax.swing.JCheckBox;

public class Main extends javax.swing.JFrame {

    /**
     * Creates new form Main
     */
    public Main() {
        initComponents();
    }

    @SuppressWarnings("unchecked")
    private void initComponents() {

        jScrollPane1 = new javax.swing.JScrollPane();
        jPanel1 = new javax.swing.JPanel();
        jButton1 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jScrollPane1.setHorizontalScrollBarPolicy(javax.swing.ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
        jScrollPane1.setPreferredSize(new java.awt.Dimension(250, 250));

        jPanel1.setPreferredSize(new java.awt.Dimension(300, 250));
        jPanel1.setLayout(new java.awt.GridLayout(0, 2, 10, 10));
        jScrollPane1.setViewportView(jPanel1);

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

        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)
                .addGroup(layout.createSequentialGroup()
                .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 309, Short.MAX_VALUE)
                .addContainerGap())
                .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addGap(0, 0, Short.MAX_VALUE)
                .addComponent(jButton1)
                .addGap(112, 112, 112)))));
        layout.setVerticalGroup(
                layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 11, Short.MAX_VALUE)
                .addComponent(jButton1)
                .addContainerGap()));

        pack();
    }

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
        JCheckBox cb = new JCheckBox("New CheckBox");

        jPanel1.add(cb);
        jPanel1.revalidate();
        jPanel1.repaint();
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /*
         * Set the Nimbus look and feel
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }

        /*
         * Create and display the form
         */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Main().setVisible(true);
            }
        });
    }
    private javax.swing.JButton jButton1;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JScrollPane jScrollPane1;
}

Thanks in advance.

解决方案

without posting a SSCCE you have to accepting that JScrollPane is designated to nest only one JComponent,
if you want to add more that one JComponent to the JScrollPane, the put there JPanel and then add a new JComponent to the JPanel instead of JScrollPane
to check how dynamically add / remove JComponents

EDIT

you have to set proper LayoutManager to the JPanel
you ahve to add JPanel to the JScrollPane
for example (without using built_in designer, even safe time for ..., required best knowledge about used SwingFramework and Swing too, I'm satisfied with plain Swing)

code

import java.awt.BorderLayout;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;

public class AddJCheckBoxToJScrollPane {

    private static final long serialVersionUID = 1L;
    private JFrame frame = new JFrame();
    private JButton jButton1;
    private JPanel jPanel1;
    private JScrollPane jScrollPane1;

    public AddJCheckBoxToJScrollPane() {
        jPanel1 = new JPanel();
        jPanel1.setLayout(new GridLayout(0, 2, 10, 10));
        jScrollPane1 = new JScrollPane(jPanel1);
        jButton1 = new JButton("Add Checkbox");
        jButton1.addActionListener(new java.awt.event.ActionListener() {

            public void actionPerformed(java.awt.event.ActionEvent evt) {
                JCheckBox cb = new JCheckBox("New CheckBox");
                jPanel1.add(cb);
                jPanel1.revalidate();
                jPanel1.repaint();
            }
        });
        frame.add(jScrollPane1);
        frame.add(jButton1, BorderLayout.SOUTH);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(300, 200);
        //frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    public static void main(String args[]) {

        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
        } catch (InstantiationException ex) {
        } catch (IllegalAccessException ex) {
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        }
        java.awt.EventQueue.invokeLater(new Runnable() {

            public void run() {
                new AddJCheckBoxToJScrollPane();
            }
        });
    }
}

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动态创建jCheckBox并添加到jScrollPane [英] Dynamically create jCheckBox and add to a jScrollPane

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