[英]Error: Main method not found in class Text, please define the main method as: public static void main(String[] args)
[英]Error: Main method not found in class mainGUI, please define the main method as: public static void main(String[] args)
我正在用Java創建GUI並收到以下錯誤:
Error: Main method not found in class mainGUI, please define the main method as:
public static void main(String[] args)
考慮到我的代碼中確實有main方法,並且確實包含一些代碼,因此我無法弄清楚為什么會這樣。 我的GUI代碼如下:
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class mainGUI extends JFrame {
/**
*
*/
private static final long serialVersionUID = 1L;
private static final int WIDTH = 400;
private static final int HEIGHT = 300;
private JLabel lengthL, widthL, areaL, perimeterL;
private JTextField lengthTF, widthTF, areaTF, perimeterTF;
private JButton calculateB, exitB;
private CalculateButtonHandler cbHandler;
private ExitButtonHandler ebHandler;
public mainGUI() {
lengthL = new JLabel("Enter the length: ", SwingConstants.RIGHT);
widthL = new JLabel("Enter the width: ", SwingConstants.RIGHT);
areaL = new JLabel("Area: ", SwingConstants.RIGHT);
perimeterL = new JLabel("Perimeter: ", SwingConstants.RIGHT);
lengthTF = new JTextField(10);
widthTF = new JTextField(10);
areaTF = new JTextField(10);
calculateB = new JButton("Calculate");
cbHandler = new CalculateButtonHandler();
calculateB.addActionListener(cbHandler);
exitB = new JButton("Exit");
ebHandler = new ExitButtonHandler();
exitB.addActionListener(ebHandler);
lengthTF = new JTextField(10);
widthTF = new JTextField(10);
areaTF = new JTextField(10);
perimeterTF = new JTextField(10);
calculateB = new JButton("Calculate");
exitB = new JButton("Exit");
Container pane = getContentPane();
pane.setLayout(new GridLayout(5, 2));
pane.add(lengthL);
pane.add(lengthTF);
pane.add(widthL);
pane.add(widthTF);
pane.add(areaL);
pane.add(areaTF);
pane.add(calculateB);
pane.add(exitB);
setTitle("Main Menu");
setSize(WIDTH, HEIGHT);
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
private class CalculateButtonHandler implements ActionListener {
public void actionPerformed(ActionEvent e) {
double width, length, area;
length = Double.parseDouble(lengthTF.getText()); //We use the getText & setText methods to manipulate the data entered into those fields.
width = Double.parseDouble(widthTF.getText());
area = length * width;
areaTF.setText("" + area);
}
}
public class ExitButtonHandler implements ActionListener {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
}
public static void main(String[] args) {
mainGUI rectObj = new mainGUI();
}
}
有人能闡明為什么會這樣嗎?
非常感謝 :)
您的代碼運行良好,請嘗試從命令行運行它,或者嘗試重新安裝eclipse,因為它不是代碼錯誤,而是環境錯誤。
如果這不起作用,請嘗試從main開始重新創建它,然后逐步向上,它應該指出日食在哪里起作用。
祝好運!
你知道,我來這里是為了尋找類似問題的答案。 原來我的Java主目錄中有一個同名的Java文件的較舊的不正確版本。 正確的文件已保存在其他目錄中。 也許您遇到了類似的問題。
編輯:我看到這篇文章已經有好幾年了。 OP現在可能是CIO。 給那些將文件保存到奇怪位置的人留下評論。
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