请注意我是新手。
在我的编程书＆＃34; SamTeachYourself Java（24小时）第7版＆＃34;中，它在第252页说（以防万一有人现在有它），你可以添加图像图标我在第7,8和9行做了一个按钮。当我运行程序时，按钮显示，没有图片。出于某种原因，在我添加图标之前，我在按钮上有文字。当我使用图标运行时，文本仍然在按钮上，即使我删除了图标的文本。我需要认真帮助！
package thing;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class Thing extends JFrame implements ActionListener {
ImageIcon a = new ImageIcon("Desktop\\oof.png");
JButton fireTorpedos = new JButton(a);
JButton noTorpedos = new JButton(a);
JButton reset = new JButton("Reset");
JLabel txt = new JLabel("Sir, should we fire the torpedos?");
JLabel output = new JLabel("");
public void actionPerformed(ActionEvent event) {
String cmd = event.getActionCommand();
switch(cmd) {
case "1":
noTorpedos.setEnabled(false);
output.setText("You fired the torpedos!");
break;
case "2":
fireTorpedos.setEnabled(false);
output.setText("You refuse to fire the torpedos!");
break;
case "3":
fireTorpedos.setEnabled(true);
noTorpedos.setEnabled(true);
output.setText("You reset the program.");
break;
}
}
public Thing() {
super("Torpedo Launcher!!");
setLookAndFeel();
setSize(200, 200);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel grid = new JPanel();
BoxLayout box = new BoxLayout(grid, BoxLayout.Y_AXIS);
grid.setLayout(box);
setVisible(true);
FlowLayout foo = new FlowLayout();
fireTorpedos.addActionListener(this);
noTorpedos.addActionListener(this);
reset.addActionListener(this);
fireTorpedos.setActionCommand("1");
noTorpedos.setActionCommand("2");
reset.setActionCommand("3");
grid.add(fireTorpedos);
grid.add(noTorpedos);
grid.add(reset);
grid.add(txt);
grid.add(output);
add(grid);
}
private void setLookAndFeel() {
try {
UIManager.setLookAndFeel (
"com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel"
);
} catch (Exception exc) {
}
}
public static void main(String[] args) {
Thing frame = new Thing();
}
}