很抱歉提出这样一个基本问题，但我只是学习并坚持将myImage.gif放入面板（或标签）。我有一个带有PictureLabel的PicturePanel。两者都与我的图像大小相同（所以我不在乎它是否在Panel或Label上显示，我只是希望它显示出来）。 我认为我将问题缩小到第57行。 NULL是我需要图像的地方。 我将图像放在文件夹中与图像位于同一目录中的文件夹中。 这是代码：
package examplegui;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
/**
* ExamlpeGUI Problem
* @author Robert J.Runyan
*/
public class ExampleGUI implements ActionListener {
JPanel inputPanel, endUpPanel, picturePanel;
JLabel endUpLabel, pictureLabel;
JButton testButton, otherButton;
JTextField textField;
public JPanel createContentPane() {
// Create a bottom JPanel to place everything on.
JPanel totalGUI = new JPanel();
totalGUI.setLayout(null);
// Create textField for User Input.
textField = new JTextField(60);
textField.setLayout(null);
textField.setLocation(10, 10);
textField.setSize(160, 30);
textField.setHorizontalAlignment(0);
textField.addActionListener(new InputListener());
textField.setBackground(Color.gray);
totalGUI.add(textField);
// Create EndUp Panel.
endUpPanel = new JPanel();
endUpPanel.setLayout(null);
endUpPanel.setLocation(10, 50);
endUpPanel.setSize(160, 30);
endUpPanel.setBackground(Color.gray);
totalGUI.add(endUpPanel);
// Create EndUp Label.
endUpLabel = new JLabel("User Input ends up here.");
endUpLabel.setLocation(0, 5);
endUpLabel.setSize(160, 25);
endUpLabel.setHorizontalAlignment(0);
endUpPanel.add(endUpLabel);
// Create Picture Panel.
picturePanel = new JPanel();
picturePanel.setLayout(null);
picturePanel.setLocation(195, 35);
picturePanel.setSize(72, 96);
picturePanel.setBackground(Color.gray);
totalGUI.add(picturePanel);
// Create Picture Label. *** Set to an IMAGE ***
pictureLabel = new JLabel();
pictureLabel.setIcon(null); // ******* Null is wrong *******
// I made the image at line 106 with this:
// image = new ImageIcon(getClass().getResource("Images/myImage.gif")).getImage();
pictureLabel.setLocation(0, 0);
pictureLabel.setSize(72, 96);
pictureLabel.setHorizontalAlignment(0);
picturePanel.add(pictureLabel);
// Create the button.
testButton = new JButton("Request User Input");
testButton.setLocation(10, 90);
testButton.setSize(160, 30);
testButton.addActionListener(new ButtonListener()); //
totalGUI.add(testButton);
// Create the otherButton.
otherButton = new JButton("The OTHER Button");
otherButton.setLocation(10, 130);
otherButton.setSize(160, 30);
otherButton.addActionListener(new ButtonListener()); //
totalGUI.add(otherButton);
totalGUI.setOpaque(true);
return totalGUI;
} // Ends JPanel CreateContent Pane
// SubClass of JPanel
public class ShowImages extends JPanel{
Image image; // Declare a name for the Image object.
Image otherCard;
public ShowImages(){ // Create a constructor method
super();
// Load an image file into our Image object.
// Make an Images folder in the Show Images folder (BY HAND NOT CODING).
// This Images folder has to be in the same directory as ShowImage.class.
// Drag-n-drop a copy of images into the Images folder (BY HAND NOT CODING).
image = new ImageIcon(getClass().getResource("Images/myImage.gif")).getImage();
otherCard = new ImageIcon(getClass().getResource("Images/otherCard.gif")).getImage();
}
public void paintComponent(Graphics g){
// Draw our Image object.
g.drawImage(image,0,0,72,96, this); // at location 0, 0, 72 wide and 96 high
g.drawImage(otherCard,0,0,72,96, this); // Draw the other Image object.
}
}
@Override // Create actionPerformed(ActionEvent event) to be OVERRIDDEN
public void actionPerformed(ActionEvent event) {
// When the user clicks, have something happen. (OVERRIDDEN)
}
// Gets source of Event (textField) and performs action.
class InputListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent evt) {
String text = textField.getText();
endUpLabel.setText(text);
textField.setBackground(Color.gray);
textField.setText("");
}
}
// Gets source of Event (ButtonPush) and performs action.
class ButtonListener implements ActionListener {
//private final static String newline = "\n";
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == testButton) {
// Code to run on testButton button push.
textField.setBackground(Color.white);
textField.setText("Please enter text here");
}
else if(e.getSource() == otherButton) {
// Code to run on otherButton button push.
endUpPanel.setBackground(Color.green);
endUpLabel.setText("Start Game");
Players thePlayer = new Players ( "Fred", 1, 5, 6500 );
thePlayer.StartGame ();
}
} // Ends actionPerformed
} // Ends ButtonListener.
// Creates the GUI.
private static void createAndShowGUI() {
JFrame.setDefaultLookAndFeelDecorated(true);
JFrame frame = new JFrame(" GUI Problem Example ");
// Create and set up the content pane.
ExampleGUI GUI = new ExampleGUI();
frame.setContentPane(GUI.createContentPane());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(300, 200);
frame.setVisible(true);
}
public static void main(String[] args) {
// Run the GUI.
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
// *** Here is the Inner Class Players. ***
public class Players {
String name; // Name of Player.
int numberPlayer; // Number for picking for Seating. (Future use).
int seatNumber;
int chipStack;
public Players( String n, int np, int st, int cs ) {
name = n;
numberPlayer = np;
seatNumber = st;
chipStack = cs;
}
// Create the Setters & Getters.
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void StartGame ( ) {
Players thePlayer = new Players ( "Fred", 1, 5, 6500 );
thePlayer.setName(name);
endUpLabel.setText("Your Card: IT WORKED!!!");
} // Ends StartGame.
} // Ends the Inner Class Players.
}
对不起，如果这是一个愚蠢的问题，我只是在学习。再次感谢。