java里有messagebox吗？

Question

OptionPane可以实现
下面是个applet的例子
import javax.swing.*;
import java.awt.*;
public class OptionPane1 extends JApplet
{
public void init()
{
JOptionPane.showMessageDialog(null,"It's a information MessageDialog!",
     "Information Message",JOptionPane.INFORMATION_MESSAGE);
JOptionPane.showMessageDialog(null,new JButton("It's a error MessageDialog!"),
     "Error Message.",JOptionPane.ERROR_MESSAGE);
JOptionPane.showConfirmDialog(null,"It's a confirmDialog","ConfirmDialog",JOptionPane.YES_NO_OPTION);
JOptionPane.showOptionDialog(null,"It's a OptionDialog.","OptionDialog",JOptionPane.YES_NO_CANCEL_OPTION,
     JOptionPane.WARNING_MESSAGE,null,null,null);
Object []options={"OK","CANCEL","I don't know."};
JOptionPane.showOptionDialog(null,
     "it's a OptionDialog with user-defined options","OptionDialog",
     JOptionPane.DEFAULT_OPTION,JOptionPane.WARNING_MESSAGE,null,options,options[0]);
String inputValue=JOptionPane.showInputDialog("It's a InputDialog,please input a value");
Object []possibleValue={"first","second","third"};
Object selectedValue=JOptionPane.showInputDialog(null,
      "It's a inputdialog.please choose one","InputDialog",
      JOptionPane.INFORMATION_MESSAGE,
      null,possibleValue,possibleValue[0]);
}
}