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我一直在研究这个程序，并且我很难在弹出的窗口中显示结果。当程序运行时，我在控制台中显示正确的输出，但是当选择单选按钮时，我需要它显示在单选按钮下的窗口中。在此先感谢，任何帮助，非常感谢。如何将列表字符串传递给JLabel并显示在JFrame中
import TrySource.TryWindow;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.util.Arrays;
import java.util.Random;
import javax.swing.*;
public class TrySomethingNew extends JFrame
{
// Radio buttons for selecting colors
private JRadioButton jrbMexican, jrbItalian;
JLabel jlblResult;
// Declare a panel for displaying message
private TryWindow TryWindow;
// Main method
public static void main(String[] args)
{
TrySomethingNew frame = new TrySomethingNew();
frame.pack();
frame.setSize(500,500);
frame.setTitle("Try Something New");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null); // Center the frame
frame.setVisible(true);
}
public TrySomethingNew()
{
// Create a MovingMessageCanvas instance and set colors
TryWindow = new TryWindow("Let's try this.");
TryWindow.setBackground(Color.WHITE);
// Panel to hold radio buttons
JPanel jpRadioButtons = new JPanel();
jpRadioButtons.setBorder(new javax.swing.border.TitledBorder("Select A Food Genre"));
jpRadioButtons.add(jrbMexican = new JRadioButton("Mexican"));
jpRadioButtons.add(jrbItalian = new JRadioButton("Italian"));
// Group radio buttons
ButtonGroup btg = new ButtonGroup();
btg.add(jrbMexican);
btg.add(jrbItalian);
//Panel to hold result
JPanel jpResultPanel = new JPanel();
jpResultPanel.setBorder(new javax.swing.border.TitledBorder("Result"));
// Place panels in the frame
setLayout(new BorderLayout());
add(TryWindow, BorderLayout.CENTER);
add(jpRadioButtons, BorderLayout.NORTH);
add(jpResultPanel, BorderLayout.CENTER);
// Register listeners with the buttons
jrbMexican.addItemListener(new EventListener());
jrbItalian.addItemListener(new EventListener());
}//end main
// Handle radio button selections
class EventListener implements ItemListener
{
public void itemStateChanged(ItemEvent e)
{
if (jrbMexican.isSelected())
{
java.util.List<String> mexicanList = Arrays.asList("Jose Locos\n853 N Glenstone Ave, Springfield, MO 65802\n(417) 831-1300",
"Amigos Mexican Restaurant\n2118 S Campbell Ave, Springfield, MO 65807\n(417) 887-1401");
Random randomizer = new Random();
String random = mexicanList.get(randomizer.nextInt(mexicanList.size()));
System.out.println(random);
}//end if jrbMexican isSelected
if (jrbItalian.isSelected())
{
java.util.List<String> italianList = Arrays.asList("Zios Italian Kitchen\n1249 E Kingsley St, Springfield, MO 65804\n(417) 889-1919",
"Bambinos Cafe\n1141 E Delmar St, Springfield, MO 65807\n(417) 862-9999");
Random randomizer = new Random();
String random = italianList.get(randomizer.nextInt(italianList.size()));
System.out.println(random);
}//end if jrbItalian isSelected
}//end itemStateChanged
}//end eventListener
}//end TrySomethingNew
package TrySource;
// TryWindow.java: Display a message on a JPanel
import java.awt.FontMetrics;
import java.awt.Graphics;
import javax.swing.JPanel;
public class TryWindow extends JPanel
{
/** The message to be displayed */
private String message = "Try Something New";
/** The x coordinate where the message is displayed */
private int xCoordinate = 465;
/** The y coordinate where the message is displayed */
private int yCoordinate = 40;
/** Indicate whether the message is displayed in the center */
private boolean centered;
/** The interval for moving the message horizontally and vertically */
private int interval = 10;
/** Default constructor */
public TryWindow()
{
}
/** Constructor with a message parameter */
public TryWindow(String message)
{
this.message = message;
}
/** Return message */
public String getMessage()
{
return message;
}
/** Set a new message */
public void setMessage(String message)
{
this.message = message;
repaint();
}
/** Return xCoordinator */
public int getXCoordinate()
{
return xCoordinate;
}
/** Set a new xCoordinator */
public void setXCoordinate(int x)
{
this.xCoordinate = x;
repaint();
}
/** Return yCoordinator */
public int getYCoordinate()
{
return yCoordinate;
}
/** Set a new yCoordinator */
public void setYCoordinate(int y)
{
this.yCoordinate = y;
repaint();
}
/** Return centered */
public boolean isCentered()
{
return centered;
}
/** Set a new centered */
public void setCentered(boolean centered)
{
this.centered = centered;
repaint();
}
/** Return interval */
public int getInterval()
{
return interval;
}
/** Set a new interval */
public void setInterval(int interval)
{
this.interval = interval;
repaint();
}
@Override
protected void paintComponent(Graphics g)
{
super.paintComponent(g);
if (centered)
{
// Get font metrics for the current font
FontMetrics fm = g.getFontMetrics();
// Find the center location to display
int stringWidth = fm.stringWidth(message);
int stringAscent = fm.getAscent();
// Get the position of the leftmost character in the baseline
xCoordinate = getWidth()/2 - stringWidth/2;
yCoordinate = getHeight()/2 + stringAscent/2;
}
g.drawString(message, xCoordinate, yCoordinate);
}
}
'添加（TryWindow，BorderLayout.CENTER）;'应该被去掉，jlblResult应该得到足够大的优选的和最小的尺寸和添加到结果面板用BorderLayout的太在中心。 – 2014-11-14 15:36:41