的Java：进度条不显示时点击该按钮

Question

在我正在开发这些天来显示一个进度条，当点击“转换”按钮，下面是我的代码所需要的应用程序，

public class Main extends JFrame{ 

private JPanel panel2 = null; 
private JPanel panel2 = null; 

JProgressBar progressBar = null; 
JButton button = null; 

Main f1 = null; 
Main f = null; 

public static void main(String[] args) { 

try 
{ 
     UIManager.setLookAndFeel(new SyntheticaBlackEyeLookAndFeel()); 

} 
catch (Exception e) 
{ 
    e.printStackTrace(); 
} 
} 
public void convert(){ 

      f = new Main(); 

    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    f.setSize(700, 400); 
    f.setLocationRelativeTo(null); 
    f.setTitle("Fromat Conversion"); 

    panel1 = new JPanel(); 
    panel1.setLayout(new BorderLayout()); 
    panel1.setForeground(Color.white); 

      button = new JButton(); 
    button.setText("Convert"); 

    panel1.add(panel3, BorderLayout.SOUTH); 

      f.setContentPane(panel1); 
    f.setVisible(true); 

      f1 = new Main(); 
      f1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     f1.setSize(457, 100); 
     f1.setTitle("Conversion Progress"); 
     f1.setLocationRelativeTo(null); 

     panel2 = new JPanel(); 
     panel2.setLayout(new BorderLayout()); 
     panel2.setForeground(Color.white); 

      progressBar = new JProgressBar(); 
     progressBar.setValue(35); 
     progressBar.setStringPainted(true); 

     panel2.add(label3, BorderLayout.WEST); 
     panel2.add(progressBar, BorderLayout.SOUTH); 

      f1.setContentPane(panel2); 
     button.addActionListener(new ActionListener() { 

      public void actionPerformed(ActionEvent e){ 

       f1.setVisible(true); 
    } 
    }); 

    } 

    } 

但是当我点击按钮进度条框不显示。

有人有想法，为什么？

谢谢

Answer 1

您的代码无法编译。

这确实会编译并显示您的进度条。

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

public class Pipo extends JFrame{ 

private static JPanel panel1 = null; 
private static JPanel panel2 = null; 

static JProgressBar progressBar = null; 
static JButton button = null; 

static Pipo f1 = null; 
static Pipo f = null; 

public static void main(String[] args) { 

    f = new Pipo(); 

    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    f.setSize(700, 400); 
    f.setLocationRelativeTo(null); 
    f.setTitle("Fromat Conversion"); 

    panel1 = new JPanel(); 
    panel1.setLayout(new BorderLayout()); 
    panel1.setForeground(Color.white); 

    button = new JButton(); 
    button.setText("Convert"); 

    panel1.add(button, BorderLayout.SOUTH); 

    f.setContentPane(panel1); 
    f.setVisible(true); 

    f1 = new Pipo(); 

    f1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    f1.setSize(457, 100); 
    f1.setTitle("Conversion Progress"); 
    f1.setLocationRelativeTo(null); 

    panel2 = new JPanel(); 
    panel2.setLayout(new BorderLayout()); 
    panel2.setForeground(Color.white); 

    progressBar = new JProgressBar(); 
    progressBar.setValue(35); 
    progressBar.setStringPainted(true); 

    panel2.add(progressBar, BorderLayout.SOUTH); 

    f1.setContentPane(panel2); 

    button.addActionListener(new ActionListener() { 
     public void actionPerformed(ActionEvent e){ 
      f1.setVisible(true); 
     } 
    }); 

    } 
}