我正在用Java创建一个简单的GPA计算器。它使用JOptionPane,但我希望用户能够在一个窗口中回答所有问题。所以,我正在试验JPanel。难以使JButton工作
当用户点击“提交”按钮时,我希望程序计算出GPA。我无法确定如何合并事件处理程序。
下面是代码:
import java.math.RoundingMode;
import java.text.DecimalFormat; format.
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import javax.swing.event.*;
public class MyGpaCalc extends JFrame {
public static void createGuiWindow() {
JFrame frame = new JFrame("GPA Calculator");
frame.setSize(300,250);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel();
JLabel aGradesLabel = new JLabel("# credits earned with A grade: ");
JTextField aGradesText = new JTextField(3);
JLabel bGradesLabel = new JLabel("# credits earned with B grade: ");
JTextField bGradesText = new JTextField(3);
JLabel cGradesLabel = new JLabel("# credits earned with C grade: ");
JTextField cGradesText = new JTextField(3);
JLabel dGradesLabel = new JLabel("# credits earned with D grade: ");
JTextField dGradesText = new JTextField(3);
JLabel fGradesLabel = new JLabel("# credits earned with F grade: ");
JTextField fGradesText = new JTextField(3);
JButton submit = new JButton("Submit");
panel.add(aGradesLabel);
panel.add(aGradesText);
panel.add(bGradesLabel);
panel.add(bGradesText);
panel.add(cGradesLabel);
panel.add(cGradesText);
panel.add(dGradesLabel);
panel.add(dGradesText);
panel.add(fGradesLabel);
panel.add(fGradesText);
frame.getContentPane().add(panel);
frame.setVisible(true);
}
public static void main(String[] args) {
createGuiWindow();
DecimalFormat df = new DecimalFormat("0.00");
df.setRoundingMode(RoundingMode.FLOOR);
double aGrades = Double.parseDouble(aGradesText.getText());
double bGrades = Double.parseDouble(bGradesText.getText());
double cGrades = Double.parseDouble(cGradesText.getText());
double dGrades = Double.parseDouble(dGradesText.getText());
double fGrades = Double.parseDouble(fGradesText.getText());
double totalCredits = aGrades + bGrades + cGrades + dGrades + fGrades;
double gradePoints = (aGrades * 4) + (bGrades * 3) + (cGrades * 2) + (dGrades * 1) + (fGrades * 0);
double sum = gradePoints/totalCredits;
System.exit(0);
}
}
谢谢。如果有人知道更多关于我的特定代码的建议,那么理解教程就容易多了。当我有机会再次处理这个问题时,我会公布结果! – JennyJ
如果答案可以解决您的问题,请将其标记为已接受。 – Monz
我很高兴做到这一点,但我不明白...请指教! – JennyJ