JButton用鼠标出现和消失

Question

When I add several JButtons to this JFrame, the buttons appear and disappear with mouse movements...kinda spooky. Any Ideas? Other Projects dont have this issue, therefore im pretty sure its my code...but its so simple im not sure whats wrong!

Full Code: (I blurred out my name)

package explorerplus;

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Toolkit;
import java.io.File;
import javax.swing.*;

public class ExplorerPlus {

//Declarations
Toolkit t = Toolkit.getDefaultToolkit();
 JFrame f = new JFrame();

public static void main(String[] args) {
   SwingUtilities.invokeLater(new Runnable() {
        public void run(){
            ExplorerPlus ep = new ExplorerPlus();
        }
    });
}
private ExplorerPlus(){
   // f.super("");
    f.setUndecorated(false);

    f.setSize(t.getScreenSize());
    f.setDefaultCloseOperation(f.EXIT_ON_CLOSE);
    Container c = null;
    c =new JScrollPane(c);
    f.setContentPane(c);
    f.setVisible(true);
    GoThrough(new File("C:/Users/*****/Pictures/"));
    f.repaint();
 }
  static int spc_count=-1;
  int curr_x = 10, curr_y = 10;
  void GoThrough(File aFile) {
spc_count++;
String spcs = "";
for (int i = 0; i < spc_count; i++)
  spcs += " ";
if(aFile.isFile()){
  System.out.println(spcs + "[FILE] " + aFile.getName());
  File file = aFile;
  String s = getExt(file) + ".png";
  JButton b = new JButton(new ImageIcon(s));
  b.setToolTipText(file.getName());
  b.setSize(256, 256);
  b.setLocation(curr_x, curr_y);
  b.setVisible(true);
  b.validate();
  f.validate();

  if(curr_x < f.getWidth() - 270){
      curr_x+=270;
  }else{
  curr_y+=270;
  curr_x = 10;
  }
  f.getContentPane().add(b);


}
else if (aFile.isDirectory()) {
  System.out.println(spcs + "[DIR] " + aFile.getName());
  File[] listOfFiles = aFile.listFiles();
  if(listOfFiles!=null) {
    for (int i = 0; i < listOfFiles.length; i++)
      GoThrough(listOfFiles[i]);
  } else {
    System.out.println(spcs + " [ACCESS DENIED]");
  }
}
spc_count--;
}

  String getExt(File f){

 if(f.getName().toLowerCase().endsWith(".jpg")|| f.getName().toLowerCase().endsWith(".jpeg")){
     return "jpeg";
 } else if(f.getName().toLowerCase().endsWith(".png")){
     return "png";
 }
 else if(f.getName().toLowerCase().endsWith(".html")){
     return "html";
 }else if(f.getName().toLowerCase().endsWith(".ini")){
     return "ini";
 }else{
     return "text";
 }
  }
  String AllButExt(File f){
      String name = f.getName();
      return name.replace(getExt(f), "");
  }
}

Answer 1

I hope I did undestand you right: you wants to display a new JButton on your JFrame. But it doesn't appear.

If so you can try to use:

f.updateUI();

After you have added the button to the frame.