如何使Java文件選擇器在NetBeans界面前顯示？

這個問題是由於我有的基本設置，在程序啓動filechooser之前，這是一個簡單的yes/no驗證。如何在NetBeans之前創建filechooser顯示？該程序的作品，我只需要瀏覽文件窗口出現在前面。如何使Java文件選擇器在NetBeans界面前顯示？

package txtkeyverifier2; 

import java.io.File; 
import java.io.FileNotFoundException; 
import java.io.FileOutputStream; 
import java.io.PrintStream; 
import java.util.Scanner; 
import javax.swing.JFileChooser; 
import javax.swing.JFrame; 

public class TxtKeyVerifier001 { 

public static void main(String[] args) throws FileNotFoundException { 

    Scanner keyboard = new Scanner(System.in); 

    System.out.print("Do you wish to continue yes/no: "); 
    String answer = keyboard.nextLine(); 

    switch (answer) { 
     case "yes": 
     case "y": { 

      ChooseFile fileChooser = new ChooseFile(); 
      File keyfile = fileChooser.getFile(); 

      Scanner sc = new Scanner(keyfile); 
      String input = sc.nextLine(); 

      if (authenticate1(input)) { 

       System.out.println("This program is working if this text is found within outputfile.txt."); 

       File outputfile = new File("outputfile.txt"); 
       FileOutputStream fos = new FileOutputStream(outputfile); 
       PrintStream ps = new PrintStream(fos); 
       System.setOut(ps); 
       System.out.println("This program is working if this text is found within outputfile.txt."); 

      } else if (authenticate2(input)) { 

       System.out.println("It works."); 

      } else { 
       System.out.println("Error: Wrong password."); 
      } 
     } 
     break; 
     case "no": 
     case "n": 

      break; 
     default: 
      System.out.println("Invalid entry"); 
      break; 
    } 
} 

private static boolean authenticate1(String password1) { 

    return ((password1.length() == 6) 
      && (password1.matches("beep11")) 
      && (password1.matches("beep11")) 
      && (password1.matches("beep11"))); 
} 

private static boolean authenticate2(String password2) { 

    return ((password2.length() == 6) 
      && (password2.matches("beep22")) 
      && (password2.matches("beep22")) 
      && (password2.matches("beep22"))); 
} 
} 

class ChooseFile { 

private JFrame frame; 

public ChooseFile() { 

    frame = new JFrame(); 
    frame.toFront(); 
    frame.setVisible(true); 

} 

public File getFile() { 
    JFileChooser fc = new JFileChooser(); 
    if (JFileChooser.APPROVE_OPTION == fc.showOpenDialog(null)) { 
     frame.setVisible(false); 
     return fc.getSelectedFile(); 
    } else { 
     System.out.println("Next time select a file."); 
     System.exit(1); 
    } 
    return null; 
} 

private void BringToFront() { 
    frame.setExtendedState(JFrame.ICONIFIED); 
    frame.setExtendedState(JFrame.NORMAL); 
} 
}

來源

2016-12-02 NumaNuma

不是傳遞null到fc.showOpenDialog的，你應該通過其母公司，通常是JFrame的內容窗格中，通過frame.getContentPane()

來源

2016-12-02 08:09:33

工程月食反正返回 –

如何使Java文件選擇器在NetBeans界面前顯示？

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