创建gui程序导致main方法出错
创建gui程序导致main方法出错
提问于 2013-09-23 21:07:09
public class Main extends JFrame {
private JButton classA[] = new JButton[12];
private JButton classB[] = new JButton[12];
private JLabel emptylbls[] = new JLabel[11];
private boolean seatA_avail[] = new boolean[12];
private boolean seatB_avail[] = new boolean[12];
public Main() {
btnHandler handler = new btnHandler();
for (int i=0; i<classA.length; i++) {
classA[i] = new JButton("A-" + (i+1));
classA[i].addActionListener(handler);
}
for (int i=0; i<classB.length; i++) {
classB[i] = new JButton("B-" + (i+1));
classB[i].addActionListener(handler);
}
for (int i=0; i<emptylbls.length; i++) {
emptylbls[i] = new JLabel("");
}
Container pane = getContentPane();
pane.setLayout(new GridLayout(7,5));
pane.add(classA[0]);
pane.add(classA[1]);
pane.add(emptylbls[0]);
pane.add(classA[2]);
pane.add(classA[3]);
pane.add(classA[4]);
pane.add(classA[5]);
pane.add(emptylbls[1]);
pane.add(classA[6]);
pane.add(classA[7]);
pane.add(classA[8]);
pane.add(classA[9]);
pane.add(emptylbls[2]);
pane.add(classA[10]);
pane.add(classA[11]);
pane.add(emptylbls[3]);
pane.add(emptylbls[4]);
pane.add(emptylbls[5]);
pane.add(emptylbls[6]);
pane.add(emptylbls[7]);
pane.add(classB[0]);
pane.add(classB[1]);
pane.add(emptylbls[8]);
pane.add(classB[2]);
pane.add(classB[3]);
pane.add(classB[4]);
pane.add(classB[5]);
pane.add(emptylbls[9]);
pane.add(classB[6]);
pane.add(classB[7]);
pane.add(classB[8]);
pane.add(classB[9]);
pane.add(emptylbls[10]);
pane.add(classB[10]);
pane.add(classB[11]);
setTitle("Airline Reservation System");
setVisible(true);
setSize(500,600);
setResizable(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLocationRelativeTo(null);
}
private class btnHandler implements ActionListener {
String names_classA[] = new String[12];
String contacts_classA[] = new String[12];
String names_classB[] = new String[12];
String contacts_classB[] = new String[12];
public void actionPerformed(ActionEvent e) {
JButton currentBut = (JButton) e.getSource();
for (int i=0;i<classA.length;i++){
if (classA[i].equals(currentBut) && seatA_avail[i] == false) {
names_classA[i] = JOptionPane.showInputDialog("Enter customer's name:");
contacts_classA[i] = JOptionPane.showInputDialog("Enter customer's contact no.:");
currentBut.setText("<html><p align=center>(Reserved)<br></br>" + currentBut.getText() + "</p></html>");
seatA_avail[i] = true;
}
else if (classA[i].equals(currentBut) && seatA_avail[i] == true) {
JOptionPane.showMessageDialog(null,"This seat is reserved to:\n" +
"Name: " + names_classA[i] +
"\nContact No: " + contacts_classA[i]);
}
else if (classB[i].equals(currentBut) && seatB_avail[i] == false) {
names_classB[i] = JOptionPane.showInputDialog("Enter customer's name:");
contacts_classB[i] = JOptionPane.showInputDialog("Enter customer's contact no.:");
currentBut.setText("<html><p align=ceNter>(Reserved)<br></br>" + currentBut.getText() + "</p></html>");
seatB_avail[i] = true;
}
else if (classB[i].equals(currentBut) && seatB_avail[i] == true) {
JOptionPane.showMessageDialog(null,"This seat is reserved to:\n" +
"Name: " + names_classB[i] +
"\nContact No: " + contacts_classB[i]);
}
}
}
}
public static void main(String[] args) {
Main obj = new Main();
}
}我的代码没有运行，eclipse告诉我创建gui程序的main方法出了问题。我不知道我的代码出了什么问题，但它也告诉我没有使用obj变量。这是我的完整代码。
提前感谢！
回答 1
Stack Overflow用户
发布于 2013-09-23 21:15:27
我刚刚运行了你的程序，没有任何问题。也许你没有正确导入。确保在主类的顶部有以下内容。
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
public class Main extends JFrame {
....
....
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/18960067
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