java 对话框程序_消息对话框Java程序

痛定思痛。 2022-12-07 12:11 250阅读 0赞

java 对话框 程序

## 用Java创建消息框 **(** Creating Message Boxes in Java **)** ##

![Man working in an office][]

Johner Images/Getty Images 约翰纳图像/盖蒂图像

A message box is a simple pop-up window that displays a message to the user and is dismissed with the click of a button. Using Java, you don't have to build your own dialog boxes from scratch; the *JOptionPane* class provides standard methods for making a variety of dialog boxes.

消息框是一个简单的弹出窗口，它向用户显示一条消息，单击按钮即可将其关闭。 使用Java，您不必从头开始构建自己的对话框。 *JOptionPane*类提供了用于制作各种对话框的标准方法。

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## 对话框的Java源代码 **(** Java Source Code for Dialog Boxes **)** ##

Below is example code showing simple message dialog boxes created using the *showMessageDialog*, *showOptionDialog *and *showConfirmDialog *methods of the *JOptionPane *class. The program goes through a couple of examples for each method leading to a series of dialog boxes appearing one after the other.

下面的示例代码显示了使用*JOptionPane*类的*showMessageDialog* ， *showOptionDialog*和*showConfirmDialog*方法创建的简单消息对话框。 该程序通过每种方法的几个示例，导致一系列对话框一个接一个地出现。

**Tip: **Have a look at JOptionPane Option Chooser Program for a more in-depth application that gives the user the option of creating all the different variations of a dialog box.

**提示：**有关更深入的应用程序，请查看JOptionPane选项选择器程序，该应用程序使用户可以选择创建对话框的所有不同变体。

//This program shows a series of dialog boxes one //after the other //Imports are listed in full to show what's being used //could just import javax.swing.* and java.awt.* etc.. import javax.swing.JFrame; import javax.swing.JOptionPane; import javax.swing.UIManager; import javax.swing.Icon; import java.awt.EventQueue; public class SimpleDialogFrame extends JFrame{ //Using a standard Java icon private Icon optionIcon = UIManager.getIcon("FileView.computerIcon"); //Application start point public static void main(String[] args) { //Use the event dispatch thread for Swing components EventQueue.invokeLater(new Runnable() { public void run() { //create GUI frame new SimpleDialogFrame().setVisible(true); } }); } public SimpleDialogFrame() { //make sure the program exits when the frame closes setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setTitle("Simple Dialog Box Example");  setSize(500,500); //This will center the JFrame in the middle of the screen setLocationRelativeTo(null); //TO TRY: Comment out the above line and use null for the parent //component in one of the JOptionPane calls to see the difference //it makes to the position of the dialog box. setVisible(true); //Use the showMessageDialog method for a plain message dialog box JOptionPane.showMessageDialog(this, "This is the dialog message" ,"This is the dialog title", JOptionPane.PLAIN_MESSAGE); //Use the showMessageDialog method for a error message dialog box JOptionPane.showMessageDialog(this, "This is the dialog message" ,"This is the dialog title", JOptionPane.ERROR_MESSAGE); //Use the showConfirmDialog method for a warning message dialog box //with OK, CANCEL buttons. Capture the button number with an int variable int choice = JOptionPane.showConfirmDialog(this, "This is the dialog message" ,"This is the dialog title", JOptionPane.WARNING_MESSAGE , JOptionPane.OK_CANCEL_OPTION); //Use the showConfirmDialog method for an information message dialog box //with YES, NO, CANCEL buttons. It shows the button choice of previous //message box JOptionPane.showConfirmDialog(this,"Last button pressed was number " + choice , "This is the dialog title", JOptionPane.INFORMATION_MESSAGE , JOptionPane.YES_NO_CANCEL_OPTION); //The showOptionDialog method can be made to work as if it were the confirmDialog //method by using null for the last three parameters. In this case the options for //the button types (YES, NO, CANCEL) and the message type (INFORMATION_MESSAGE) //will be used. JOptionPane.showOptionDialog(this, "This is the dialog message" , "This is the dialog title", JOptionPane.YES_NO_CANCEL_OPTION, JOptionPane.INFORMATION_MESSAGE ,null, null, null); //Use the showOptionDialog method to make a custom box. If the options parameter //is null the YES, NO, CANCEL buttons are used. Also notice that even though //the message type is INFORMATION_MESSAGE the usual icon is overriden by the one //provided. JOptionPane.showOptionDialog(this, "This is the dialog message" , "This is the dialog title", JOptionPane.YES_NO_CANCEL_OPTION, JOptionPane.INFORMATION_MESSAGE ,optionIcon, null, null); //String array to be used for the buttons String[] buttonOptions = new String[] {"Happy Button", "Sad Button", "Confused Button"}; //If the options parameter is not null the YES, NO, CANCEL buttons are not used //The buttons are made with the object array - in this case a String array. JOptionPane.showOptionDialog(this, "This is the dialog message" , "This is the dialog title", JOptionPane.YES_NO_CANCEL_OPTION, JOptionPane.INFORMATION_MESSAGE  ,optionIcon, buttonOptions, buttonOptions[0]); } }

> 翻译自: [https://www.thoughtco.com/simple-message-dialog-boxes-program-2033985][https_www.thoughtco.com_simple-message-dialog-boxes-program-2033985]

java 对话框 程序

[Man working in an office]: /images/20221123/1c5de9b18c6a408b9a92f21b68214c6c.png
[https_www.thoughtco.com_simple-message-dialog-boxes-program-2033985]: https://www.thoughtco.com/simple-message-dialog-boxes-program-2033985