Posted on 2008-06-15 18:54
fcp 阅读(7819)
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j2se 、
swing
简单的说这个类实现的就是一个messagebox，主要使用的是static的函数
不多说了，直接看例子
showMessageDialog
显示一个带有OK按钮的模态对话框。你能简单的指定显示的消息，图标，对话框标题。下面是几个使用showMessageDialog的例子
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 //default title and icon
JOptionPane.showMessageDialog(frame,
"Eggs are not supposed to be green.",
"Message");
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//custom title, warning icon
JOptionPane.showMessageDialog(frame,
"Eggs are not supposed to be green.",
"Inane warning",
JOptionPane.WARNING_MESSAGE);
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//custom title, error icon
JOptionPane.showMessageDialog(frame,
"Eggs are not supposed to be green.",
"Inane error",
JOptionPane.ERROR_MESSAGE);
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//custom title, no icon
JOptionPane.showMessageDialog(frame,
"Eggs are not supposed to be green.",
"A plain message",
JOptionPane.PLAIN_MESSAGE);
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//custom title, custom icon
JOptionPane.showMessageDialog(frame,
"Eggs are not supposed to be green.",
"Inane custom dialog",
JOptionPane.INFORMATION_MESSAGE,
icon);
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showOptionDialog
显示一个有特殊的按钮，消息，图标，标题的模态对话框。用这个函数，你可以改变显示在按钮上的文字。你还可以执行更多的个性化操作。
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//Custom button text
  Object[] options =  {"Yes, please",
 "No, thanks",
 "No eggs, no ham!"};
int n = JOptionPane.showOptionDialog(frame,
"Would you like some green eggs to go "
+ "with that ham?",
"A Silly Question",
JOptionPane.YES_NO_CANCEL_OPTION,
JOptionPane.QUESTION_MESSAGE,
null,
options,
options[2]);
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个性化按钮的文字
![A yes/no dialog, in those words [but perhaps translated]](http://java.sun.com/docs/books/tutorial/figures/uiswing/components/CustomizingButtonTextMetal.png) |
//default icon, custom title
int n = JOptionPane.showConfirmDialog(
frame,
"Would you like green eggs and ham?",
"An Inane Question",
JOptionPane.YES_NO_OPTION);
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Object[] options = {"Yes, please",
"No way!"};
int n = JOptionPane.showOptionDialog(frame,
"Would you like green eggs and ham?",
"A Silly Question",
JOptionPane.YES_NO_OPTION,
JOptionPane.QUESTION_MESSAGE,
null, //do not use a custom Icon
options, //the titles of buttons
options[0]); //default button title
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ShowXxxDialog中产生的窗体唯一的不返回整形的就是showInoutDialog，取而代之的是它返回一个Object类型。这个Object类型一般是一个String类型，反应了用户的输入。这是一个例子，用showInputdialog去创建一个让用户从三个字符串中选择一个字符串的窗口。
Object[] possibilities = {"ham", "spam", "yam"};
String s = (String)JOptionPane.showInputDialog(
frame,
"Complete the sentence:\n"
+ "\"Green eggs and\"",
"Customized Dialog",
JOptionPane.PLAIN_MESSAGE,
icon,
possibilities,
"ham");
//If a string was returned, say so.
if ((s != null) && (s.length() > 0)) {
setLabel("Green eggs and " + s + "!");
return;
}
//If you're here, the return value was null/empty.
setLabel("Come on, finish the sentence!");
如果你不想去限制用户的输入，你可以？？？？？或者指定null替代Object类型的数组。用java标准的界面风格，替代以后的结果是这样的：
Icons used by JOptionPane
(Java look and feel)
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| question |
information |
warning |
error |
(Windows look and feel)
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| question |
information |
warning |
error |
参考: http://java.sun.com/docs/books/tutorial/uiswing/components/dialog.html