如何将jlabel文本对齐到jpanel内部

Question

我正在尝试将Jlabel与左边对齐但是我没有做到这一点让我知道如何解决这个问题任何有关此问题的建议将不胜感激

我尝试使用这段代码但它没有解决问题

   Jlabel=new JLabel("Label text",SwingConstants.LEFT);
   Jlabel.setHorizontalAlignment(SwingConstants.LEFT);  

这是我的完整代码

import javax.swing.*;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;


public class MyGui1 extends JPanel implements ActionListener {
    /**
     * 
     */
    static JScrollPane jsp;
    protected JPanel panel;
    protected JTextArea textarea;
    static JFrame frame;    
    JLabel Jlabel=null;

    public MyGui1() {
      //to lay out the container's components in a rectangular grid
        super(new GridBagLayout());

        GridBagConstraints c = new GridBagConstraints();
        c.gridwidth = GridBagConstraints.REMAINDER;

        c.fill = GridBagConstraints.HORIZONTAL;

        JButton jbutton=new JButton("button");
        jbutton.setActionCommand("button");
        jbutton.addActionListener(this);
        add(jbutton,c);

        c.gridy=1;
      c.gridwidth = GridBagConstraints.REMAINDER;
        c.fill = GridBagConstraints.BOTH;

        c.weightx = 1.0;
        c.weighty = 1.0;
        setBackground(Color.cyan);
        panel=new JPanel();
        panel.setLayout(new BoxLayout(panel,BoxLayout.PAGE_AXIS));
        jsp=new JScrollPane(panel);

        jsp.setPreferredSize(new Dimension(300,300));

        jsp.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
        jsp.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED);

        add(jsp, c);
        setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));

    }

    public void actionPerformed(ActionEvent evt) {

         if("button".equals(evt.getActionCommand())){
             execute();
         }
    }

   synchronized public void execute(){

            // to remove all the content of panel
            panel.removeAll();
            // to refresh the window

                for(int i=0;i<20 ;i++){


                         Jlabel=new JLabel("Labe1l"+i,SwingConstants.LEFT);

                        // Jlabel.setAlignmentX(CENTER_ALIGNMENT);
                        // Jlabel.setAlignmentY(LEFT_ALIGNMENT);
                         textarea=new JTextArea();
                         textarea.setText("sample text");
                         if(i==2){
                          textarea.setText("sample text........................\nsample text.................. ");
                         }
                       if(i==5){
                          textarea.setText("sample text.\nsample text.sample text.\nsample text. ");
                         }
                     if(i==7){
                          textarea.setText("sample text.\nsample text.sample text.\nsample text sample text..\nsample text.sample text..\nsample text. ");
                         }
                          textarea.append("\n");
                     textarea.setEditable(false);
                        Jlabel.setLayout(new BorderLayout());
                         Jlabel.setHorizontalAlignment(SwingConstants.LEFT);
                       panel.add(Jlabel);

                           // in order to wrap up the data in text area
                           textarea.setLineWrap(true);
                            panel.add(textarea);   
                           Jlabel.setPreferredSize(new Dimension(240,30));
                           javax.swing.SwingUtilities.invokeLater(new Runnable() {
                               public void run() {
                               //    textarea.setPreferredSize(getMinimumSize());
                                //  panel.setPreferredSize(getSize());
                                panel.revalidate();
                                  panel.repaint();
                                   jsp.getVerticalScrollBar().setValue(0);
                                   jsp.validate();

                               }
                           });

                        } 
                    jsp.revalidate();
                    jsp.repaint();
                    frame.repaint();
                        frame.revalidate();


  }
    @SuppressWarnings("static-access")
    private static void createAndShowGUI() {
        //Create and set up the window.
        frame = new JFrame("DesktopSearchEngine");
        frame.setLayout(new BorderLayout());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //adding window listener for exit operation
        frame.addWindowListener( new WindowAdapter()
        {
            public void windowClosing(WindowEvent e)
            {
                JFrame frame = (JFrame)e.getSource();

                int result = JOptionPane.showConfirmDialog(
                    frame,
                    "Are you sure you want to exit the application?",
                    "Exit Application",
                    JOptionPane.YES_NO_OPTION);

                if (result == JOptionPane.YES_OPTION)
                    {

                    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                    }
                else if(result==JOptionPane.NO_OPTION){
                    frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
                }
            }
        });
        //Add contents to the window GUI part and to perform all operations
        frame.add(new MyGui1());

        //Display the window.
        frame.pack();
        //to keep the frame visible 
        frame.setVisible(true);

    }

    public static void main(String[] args) {
        //Schedule a job for the event dispatch thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();


            }
        });
    }

    } 

Answer 1

您可以使用JPanel

将标签打包在FlowLayout.LEADING中

JPanel wrapper = new JPanel(new FlowLayout(FlowLayout.LEADING,0, 0));
wrapper.add(Jlabel);
panel.add(wrapper);

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还要记住遵循Java命名约定。变量以小写字母开头，使用驼峰套管：Jlabel→jLabel