[英]Error: Could not find or load main class
I'm new to Java programming and doing this as a project for school. 我是Java编程的新手,并以此作为学校的项目。 Here's the code I've written
这是我写的代码
public static void main(String args[])
import javax.swing.*;
import java.awt.event.*;
public class SleepCounter extends JFrame {
private JPanel panel;
private JLabel messageLabel;
private JTextField sleepTextField;
private JTextField sleepAnswerField;
private final int WINDOW_WIDTH = 310;
private final int WINDOW_HEIGHT = 100;
public SleepCounter() {
setTitle("Sleep Counter");
setSize(WINDOW_WIDTH, WINDOW_HEIGHT);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
buildPanel();
add(panel);
setVisible(true);
}
private void buildPanel() {
dailyLabel = new JLabel("Enter Sleep " + "in hours");
hourTextField = new JTextField(10);
CalcButton = new JButton("Calculate");
CalcButton.addActionListener(new CalcButtonListener());
panel = new JPanel();
panel.add(dailyLabel);
panel.add(sleepTextField);
panel.add(CalcButton);
panel.add(sleepAnswerField);
}
private class CalcButtonListener implements ActionListener {
public void actionPerformer(ActionEvent e) {
String input;
int total;
input = sleepTextField.getText();
for (int i = 0; i < 7; i++); {
input += total;
}
JOptionPane.showMessageDialog(null, "The total amount of sleep for " + (i + 1) + "days is" + total);
if (int i > 7) {
double avg = (total / 7);
JOptionPane.showMessageDialog(null, "The avg amount of sleep for 7 days is" + avg);
}
}
}
}
When running I get an error message saying: 运行时,我收到一条错误消息:
Error: Could not find or laod main class Graduation Project.
I've done a search of this site and checked the answers as much as I know how. 我已经搜索了该站点并尽我所能检查了答案。 I would appreciate any help that you offer.
我会很感激您提供的任何帮助。
You have put main method outside the class 您已经将主要方法放在了课外
public class YourClass
{
public static void main(String args[])
{
}
}
place it inside and remember you cant put anything before these imports 放进去,记住在这些进口之前你不能放任何东西
import javax.swing.*;
import java.awt.event.*;
It's a bit hard to tell from your formatting. 从格式上很难分辨出来。 But if you're going to be running a class called "Graduation", you're code is going to have to look like this:
但是,如果要运行一个名为“ Graduation”的类,则代码将必须如下所示:
public class Graduation{
public static void main (String[] args){
}
}
You need the Graduation class, and it needs to have a main method that conforms to that. 您需要Graduation类,并且它需要一个符合该类的main方法。 It's not clear from your example that your methods are actually inside a class.
从您的示例尚不清楚您的方法是否实际上在类内。 Is it compiling?
正在编译吗?
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