如何检查用户是否在JDialogBox中输入了某些内容？

问题描述：

public class Test{ 

    public static void main(String args[]) 

    { 

     JTextField firstName = new JTextField(); 

     JTextField lastName = new JTextField(); 

     JPasswordField password = new JPasswordField(); 

     final JComponent[] inputs = new JComponent[] { 

         new JLabel("First"), 

         firstName, 

         new JLabel("Last"), 

         lastName, 

         new JLabel("Password"), 

         password 

     }; 

     JOptionPane.showMessageDialog(null, inputs, "My custom dialog",JOptionPane.PLAIN_MESSAGE); 

     System.out.println("You entered " +firstName.getText() + ", " +lastName.getText() + ", " +password.getText()); 

    } 
}

如何检查，如果用户插入的所有字段或不是自定义对话框？而且，即使用户关闭对话框，它显示

You entered , ,

我要检查用户输入的字段和关闭应用程序，如果没有dsplaying

"You entered , , "

为什么不对这些字段执行'null'检查，如果这3个字段中的任何一个为空，则再次显示对话框，指示所有字段都是必需的。 – mre 2011-06-13 11:52:42

请参阅：http://stackoverflow.com/questions/4608124/how-to-assign-a-sepecifc-action-to-the-cancel-button-within-joptionpane-show – 2011-06-13 11:53:04

谢谢，我明白了......但是什么关于关闭操作 – sanu 2011-06-13 11:54:24

答

用户关闭对话框，您可以检查用户是否已经插入所有字段或不如下：

if(firstName.getText() != "" && lastName.getText() != "" && password.getText() != "") 
    System.out.println("All fields have been filled!"); 
else 
    System.out.println("Some fields are need to be filled!");

编辑：

为了关闭对话框后，显示一个消息，你可以不喜欢它：

myframe.addWindowListener(new WindowAdapter() 
{ 
    public void windowClosing(WindowEvent e) 
    { 
     JOptionPane.showMessageDialog(null,"You entered " + firstName.getText() + ", " + lastName.getText() + ", " +password.getText()); 
    } 
});

EDIT2：

OK，我想我现在明白你的问题，试试这个：

public class Test 
{ 
    public static void main(String args[]) 
    { 
     JTextField firstName = new JTextField(); 
     JTextField lastName = new JTextField(); 
     JPasswordField password = new JPasswordField(); 
     final JComponent[] inputs = new JComponent[] 
     { 
      new JLabel("First"), 
      firstName, 
      new JLabel("Last"), 
      lastName, 
      new JLabel("Password"), 
      password   
     }; 
     int i = JOptionPane.showConfirmDialog(null, inputs, "My custom dialog",JOptionPane.PLAIN_MESSAGE); 
     if(i == 0) System.out.println("You entered " + firstName.getText() + ", " + lastName.getText() + ", " + password.getText()); 
    } 
}

我不认为这是OP正在寻找... – mre 2011-06-13 11:53:37

@mre：至少，这是我理解的形式在OP – 2011-06-13 12:09:20

@ Eng.Fouad，如何将一个窗口监听器添加到' JOptionPane'对话框？ – mre 2011-06-13 12:09:22

答

我建议分隔每个数据的不同方法。

import javax.swing.JComponent; 
import javax.swing.JLabel; 
import javax.swing.JOptionPane; 
import javax.swing.JPasswordField; 
import javax.swing.JTextField; 

public class Test { 

public static void main(String args[]) 
    { 
     JTextField firstName = new JTextField(); 
     JTextField lastName = new JTextField(); 
     JPasswordField password = new JPasswordField(); 
     final JComponent[] inputs = new JComponent[] { 
       new JLabel("First"), 
       firstName, 
       new JLabel("Last"), 
       lastName, 
       new JLabel("Password"), 
       password 
     }; 

     JOptionPane.showMessageDialog(null, inputs, "My custom dialog",JOptionPane.PLAIN_MESSAGE); 

     System.out.println("You entered '" + 
      firstName.getText() + "', '" + 
      lastName.getText() + "', '" + 
      //don't ignore deprecation warnings! 
      new String(password.getPassword()) + "'."); 
    } 
}

这样的话，你可以知道哪些字段（S）中缺少。

You entered '', 'johnson', ''. 
You entered 'john', '', ''. 
You entered '', '', 'johnsjohnson'.

答

简短的回答，请检查是否有任何留在印刷前的字符串。

if(firstName.getText().equals("")) { 
    //Respond appropriately to empty string 
} else { 
    // Respond appropriately to non-empty string 
}

如何检查用户是否在JDialogBox中输入了某些内容？

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