Swing中的JOptionPane类

Swing中的JOptionPane类详解
JOptionPane 有助于方便地弹出要求用户提供值或向其发出通知的标准对话框。

需要实例化

第一类：信息类对话框

方法1:showMessageDialog(Component parentComponent, Object message)
????????? 调出标题为 "Message" 的信息消息对话框
?? parentComponent - 确定在其中显示对话框的 Frame；如果为 null 或者?????????? parentComponent 不具有 Frame，则使用默认的 Frame

方法1重载1：public static void showMessageDialog(
???????? Component parentComponent,
???????????????????????????????????? Object message,
???????????????????????????????????? String title,
???????????????????????????????????? int messageType)
????????? messageType - 要显示的消息类型：有常量，区别为显示的图标不同
????????? JOptionPane.ERROR_MESSAGE,
?? JOptionPane.INFORMATION_MESSAGE,
?? JOptionPane.WARNING_MESSAGE,
?? JOptionPane.QUESTION_MESSAGE
?? JOptionPane.PLAIN_MESSAGE
方法1重载2：public static void showMessageDialog(Component parentComponent,
???????????????????????????????????? Object message,
???????????????????????????????????? String title,
???????????????????????????????????? int messageType,
???????????????????????????????????? Icon icon)
?icon - 要在对话框中显示的图标，该图标可以帮助用户识别要显示的消息种类

第二类：确认对话框

方法2：public static int showConfirmDialog(Component parentComponent,Object message)
?????? 返回值为用户点击的按钮的序号
方法2重载:
?????? showConfirmDialog(Component parentComponent,Object message,
??????????????????????????????????? String title,
??????????????????????????????????? int optionType)
?optionType为YES_NO_OPTION、YES_NO_CANCEL_OPTION 或 OK_CANCEL_OPTION
方法2重载：
?showConfirmDialog(Component parentComponent,
??????????????????????????????????? Object message,
??????????????????????????????????? String title,
??????????????????????????????????? int optionType,
??????????????????????????????????? int messageType)
方法3重载:
? showConfirmDialog(Component parentComponent,
??????????????????????????????????? Object message,
??????????????????????????????????? String title,
??????????????????????????????????? int optionType,
??????????????????????????????????? int messageType,
??????????????????????????????????? Icon icon)
?messageType - 指定此消息种类的整数；主要用于确定来自可插入外观的图标：?ERROR_MESSAGE、INFORMATION_MESSAGE、WARNING_MESSAGE、QUESTION_MESSAGE 或 ?PLAIN_MESSAGE

第三类:提示要求某些输入。
方法3：public static String showInputDialog(Component parentComponent,
???????????????????????????????????? Object message)
方法3重载1：public static String showInputDialog(Component parentComponent,
???????????????????????????????????? Object message,
???????????????????????????????????? Object initialSelectionValue)
?initialSelectionValue - 用于初始化输入字段的值
方法3重载2：public static String showInputDialog(Component parentComponent,
???????????????????????????????????? Object message,
???????????????????????????????????? String title,
???????????????????????????????????? int messageType)
?messageType - 要显示的消息类型：ERROR_MESSAGE、INFORMATION_MESSAGE、?WARNING_MESSAGE、QUESTION_MESSAGE 或 PLAIN_MESSAGE

方法3重载3：public static Object showInputDialog(Component parentComponent,
???????????????????????????????????? Object message,
???????????????????????????????????? String title,
???????????????????????????????????? int messageType,
???????????????????????????????????? Icon icon,
???????????????????????????????????? Object[] selectionValues,
???????????????????????????????????? Object initialSelectionValue)
??selectionValues - 给出可能选择的 Object 数组，将显示成下拉列表框，只允许选择

?测试代码:

package dialogs;import java.awt.BorderLayout;import java.awt.Component;import java.awt.Toolkit;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.Icon;import javax.swing.ImageIcon;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JOptionPane;public class DialogTest {public static final JOptionPane j = new JOptionPane();public static void main(String[] args) {final JFrame jf = new JFrame();JButton btn1 = new JButton();JButton btn2 = new JButton();JButton btn3 = new JButton();btn1.setText("OptionDialog");btn2.setText("InputDialog");btn3.setText("MessageDialog");jf.setSize(350,80);jf.setResizable(false);Toolkit t = Toolkit.getDefaultToolkit();double width = t.getScreenSize().getWidth();double height = t.getScreenSize().getHeight();int x = Double.valueOf((width-320)/2).intValue();int y = Double.valueOf((height-80)/2).intValue();jf.setLocation(x,y);jf.setTitle("JOptionPaneTest by Eric zhou");jf.add(btn1,BorderLayout.EAST);jf.add(btn2,BorderLayout.CENTER);jf.add(btn3,BorderLayout.WEST);jf.setVisible(true);jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);btn1.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent arg0) {confirm(jf,"Are You Sure?");}});btn2.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent arg0) {j.showInputDialog(jf,"Input Your Password Please!");}});btn3.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent arg0) {alert(jf,"You Got A Message!");}});}public static void alert(Component parentComponent,String str){j.showMessageDialog(parentComponent,                str,                "actionPerformed...",                JOptionPane.INFORMATION_MESSAGE,                new ImageIcon("c:\\1.jpeg"));}public static void confirm(Component parentComponent,String str){j.showConfirmDialog( parentComponent,                 str,                 "actionPerformed...",                 JOptionPane.OK_CANCEL_OPTION ,                 JOptionPane.QUESTION_MESSAGE,                 new ImageIcon("c:\\1.jpeg"));}}

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