如何将标签放入已创建的内部框架中？ [关闭]

Question

给我一个任务，我需要创建一个工具来分析文本字段，然后通过单击按钮输出有关所述文本主体的一些统计信息。 我似乎拥有大多数基本框架，但在将两个标签分别为averageLength和totalWords并添加到我的JPanel中并在下面输入我的正文的位置上使用JPanel时遇到了麻烦。 任何帮助将非常感激。 代码在这里：

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class TextStatisticsPanel extends JPanel
{

//Field for block of text
private JTextArea userText;
//Button to calculate Statistics
private JButton stats;
//Label for where statistics are shown and statistics
private JLabel averageLength, totalWords;

public TextStatisticsPanel(){

//creating the area for user text with wrapped text
userText = new JTextArea();
userText.setWrapStyleWord(true);
userText.setLineWrap(true);

//create button
stats = new JButton("Update Text Statistics");
//Listener for button
stats.addActionListener(new ButtonListener());

//Tilted border creater
JPanel statPanel = new JPanel();
statPanel.setBorder(BorderFactory.createTitledBorder("Text Statistics"));

statPanel.setOpaque(false);



//Create Scroller
JScrollPane scroller = new JScrollPane(userText);
scroller.setPreferredSize(new Dimension (350, 400));
scroller.setBorder(BorderFactory.createTitledBorder  ("Enter the text below"));
//Add the statistics labels
averageLength = new JLabel("The average length of the words: ");
totalWords = new JLabel("The total number of words: ");

//add GUI
add(statPanel);
add(scroller);
add(averageLength);
add(totalWords);
setBackground(new java.awt.Color(202, 225, 255));
setPreferredSize(new Dimension (400, 600));
add(stats);

}

// When button is pressed do :
private class ButtonListener implements ActionListener{

public void actionPerformed(ActionEvent event)
{

    if (event.getSource() == stats){
        //Call statUpdate Method
        statUpdate();

    }
}

// Create statUpdate Method
private void statUpdate() 
{
    //Grab text user inputed
    String text = userText.getText();
    //Split the text by each space to find the number of words
    String[] words = text.split(" ");

    //Calculation for average
    float average = (text.length() - words.length)/words.length;
    //
    averageLength.setText(String.valueOf(average));
    totalWords.setText(String.valueOf(words.length));

    System.out.println(averageLength);
    System.out.println(totalWords);



}
}


}

可以尝试使用MCVE，这是相关代码的一部分，但是我仍然无法解决问题的根源。

我第二个面板的代码是：

JPanel statPanel = new JPanel();
statPanel.setBorder(BorderFactory.createTitledBorder("Text Statistics"));

statPanel.setOpaque(false);

因此，据我了解，这是我在应用程序中创建第二个面板。 但是问题是，它被放置在看似随机的位置，并且没有缠绕在我希望放在该面板内的两个标签周围，并且我不确定如何解决此问题。

主要类代码：

import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.JFrame;

public class TextStatistics {

public static void main(String[] args) {
    JFrame frame = new JFrame("Text Statistics Tool");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    TextStatisticsPanel panel = new TextStatisticsPanel();
    frame.getContentPane().add(panel);

    frame.pack();
    frame.setVisible(true);
}

}

提供一个直观的示例来显示我认为是问题和遇到的问题的代码

问题可视化

Answer 1

这是我放在一起的GUI。

这些是我所做的主要更改。

1. 我将JFrame代码放在Runnable中，因此可以通过调用SwingUtilities invokeLater方法来启动Swing应用程序。 invokeLater方法可确保在事件调度线程上创建和更新Swing组件。 我和Oracle都要求每个人都在Event Dispatch线程上启动其Swing应用程序。

2. 我在您的TextStatisticsPanel类中定义了几个新的JPanels，并使用了两个Swing布局管理器 BorderLayout和BoxLayout。 研究前一句话中的链接。 通过学习，我的意思是要花费至少2到3周的8小时时间来吸收Swing布局管理器的所有来龙去脉。

3. 我添加了JTextFields来保存计算值。 那就是JTextFields的目的。

4. 我修复了您的statUpdate方法中的整数除法。

这是代码。 我将所有内容放到一个文件中，这样上传起来会更容易。 您应该将这些类放在单独的文件中。

package com.ggl.testing;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

public class TextStatistics {

    public static void main(String[] args) {
        Runnable runnable = new Runnable() {
            @Override
            public void run() {
                JFrame frame = new JFrame("Text Statistics Tool");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

                TextStatisticsPanel panel = new TextStatistics().new TextStatisticsPanel();
                frame.add(panel);

                frame.pack();
                frame.setLocationByPlatform(true);
                frame.setVisible(true);
            }
        };
        SwingUtilities.invokeLater(runnable);
    }

    public class TextStatisticsPanel extends JPanel {
        private static final long serialVersionUID = 9049744714586970558L;
        // Field for block of text
        private JTextArea userText;
        // Button to calculate Statistics
        private JButton stats;
        // Label for where statistics are shown and statistics
        private JLabel averageLength, totalWords;
        private JTextField averageLengthField, totalWordsField;

        public TextStatisticsPanel() {

            // creating the area for user text with wrapped text
            userText = new JTextArea();
            userText.setWrapStyleWord(true);
            userText.setLineWrap(true);

            // create button
            stats = new JButton("Update Text Statistics");
            stats.setAlignmentX(JButton.CENTER_ALIGNMENT);
            // Listener for button
            stats.addActionListener(new ButtonListener());

            // Tilted border creater
            JPanel statPanel = new JPanel();
            statPanel.setBorder(BorderFactory
                    .createTitledBorder("Text Statistics"));
            statPanel.setLayout(new BoxLayout(statPanel, BoxLayout.PAGE_AXIS));
            statPanel.setOpaque(false);

            // Create Scroller
            JScrollPane scroller = new JScrollPane(userText);
            scroller.setPreferredSize(new Dimension(350, 400));
            scroller.setBorder(BorderFactory
                    .createTitledBorder("Enter the text below"));

            // Add the statistics labels
            averageLength = new JLabel("The average length of the words: ");
            averageLength.setOpaque(false);

            averageLengthField = new JTextField(10);
            averageLengthField.setEditable(false);
            averageLengthField.setOpaque(false);

            totalWords = new JLabel("The total number of words: ");
            totalWords.setOpaque(false);

            totalWordsField = new JTextField(10);
            totalWordsField.setEditable(false);
            totalWordsField.setOpaque(false);

            // add GUI
            setLayout(new BorderLayout());

            statPanel.add(stats);
            statPanel.add(Box.createVerticalStrut(10));

            JPanel lengthPanel = new JPanel();
            lengthPanel.setOpaque(false);
            lengthPanel.add(averageLength);
            lengthPanel.add(averageLengthField);
            statPanel.add(lengthPanel);
            statPanel.add(Box.createVerticalStrut(10));

            JPanel wordsPanel = new JPanel();
            wordsPanel.setOpaque(false);
            wordsPanel.add(totalWords);
            wordsPanel.add(totalWordsField);
            statPanel.add(wordsPanel);

            add(statPanel, BorderLayout.SOUTH);
            add(scroller, BorderLayout.CENTER);
            setBackground(new java.awt.Color(202, 225, 255));
        }

        // When button is pressed do :
        private class ButtonListener implements ActionListener {

            public void actionPerformed(ActionEvent event) {

                if (event.getSource() == stats) {
                    // Call statUpdate Method
                    statUpdate();
                }
            }

            // Create statUpdate Method
            private void statUpdate() {
                // Grab text user inputed
                String text = userText.getText();
                // Split the text by each space to find the number of words
                String[] words = text.split(" ");

                // Calculation for average
                float average = ((float) text.length() - words.length)
                        / words.length;
                //
                averageLengthField.setText(String.valueOf(average));
                totalWordsField.setText(String.valueOf(words.length));
            }
        }
    }

}