我想用JFrame制作一个成绩计算器，但我总是得到一个白色的屏幕，如果你能帮助我，我将不胜感激。
主要类别：
package me.imfrozen;
public class TheMainClass {
public static void main(String[] args) {
new FrameA();
}
}
Frame-Class，其中包含所有按钮和Spinners：
package me.imfrozen;
import java.awt.Font;
import java.awt.Toolkit;
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.JSpinner;
import javax.swing.SpinnerNumberModel;
@SuppressWarnings("serial")
public class FrameA extends JFrame {
static JSpinner sa6;
static JSpinner sa7;
static JSpinner sa8;
static JSpinner sa1;
static JSpinner sa2;
static JSpinner sa3;
static JSpinner sa4;
static JSpinner sa5;
static JSpinner ex2;
static JSpinner ex3;
static JSpinner ex7;
static JSpinner ex8;
static JSpinner ex5;
static JSpinner ex4;
static JSpinner ex6;
static JSpinner ex1;
static JSpinner af2;
static JSpinner af4;
static JSpinner af6;
static JSpinner af8;
static JSpinner af3;
static JSpinner af1;
static JSpinner af5;
static JSpinner af7;
static JButton btnNewButton;
private JLabel lblDeinNotendurchschnitt;
private JLabel lblNote;
public FrameA() {
getContentPane().setFont(new Font("Tahoma", Font.PLAIN, 30));
setVisible(true);
setTitle("Notenrechner");
setIconImage(Toolkit.getDefaultToolkit().getImage(FrameA.class.getResource("/me/imfrozen/icon.png")));
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 500, 452);
JLabel lblSchulaufgaben = new JLabel("Schulaufgaben");
lblSchulaufgaben.setBounds(37, 11, 130, 31);
lblSchulaufgaben.setFont(new Font("Tahoma", Font.PLAIN, 20));
JLabel lblExen = new JLabel("Stegreifaufgaben");
lblExen.setBounds(200, 11, 152, 31);
lblExen.setFont(new Font("Tahoma", Font.PLAIN, 20));
JLabel lblAbfragen = new JLabel("Abfragen");
lblAbfragen.setBounds(388, 11, 80, 31);
lblAbfragen.setFont(new Font("Tahoma", Font.PLAIN, 20));
JSpinner sa5 = new JSpinner();
sa5.setBounds(97, 53, 50, 50);
sa5.setModel(new SpinnerNumberModel(0, 0, 6, 1));
sa5.setFont(new Font("Tahoma", Font.PLAIN, 30));
sa6 = new JSpinner();
sa6.setBounds(97, 114, 50, 50);
sa6.setModel(new SpinnerNumberModel(0, 0, 6, 1));
sa6.setFont(new Font("Tahoma", Font.PLAIN, 30));
sa7 = new JSpinner();
sa7.setBounds(97, 175, 50, 50);
sa7.setModel(new SpinnerNumberModel(0, 0, 6, 1));
sa7.setFont(new Font("Tahoma", Font.PLAIN, 30));
sa8 = new JSpinner();
sa8.setBounds(97, 236, 50, 50);
sa8.setModel(new SpinnerNumberModel(0, 0, 6, 1));
sa8.setFont(new Font("Tahoma", Font.PLAIN, 30));
sa1 = new JSpinner();
sa1.setBounds(37, 53, 50, 50);
sa1.setModel(new SpinnerNumberModel(0, 0, 6, 1));
sa1.setFont(new Font("Tahoma", Font.PLAIN, 30));
sa2 = new JSpinner();
sa2.setBounds(37, 114, 50, 50);
sa2.setModel(new SpinnerNumberModel(0, 0, 6, 1));
sa2.setFont(new Font("Tahoma", Font.PLAIN, 30));
sa3 = new JSpinner();
sa3.setBounds(37, 175, 50, 50);
sa3.setModel(new SpinnerNumberModel(0, 0, 6, 1));
sa3.setFont(new Font("Tahoma", Font.PLAIN, 30));
sa4 = new JSpinner();
sa4.setBounds(37, 236, 50, 50);
sa4.setModel(new SpinnerNumberModel(0, 0, 6, 1));
sa4.setFont(new Font("Tahoma", Font.PLAIN, 30));
ex2 = new JSpinner();
ex2.setBounds(210, 53, 50, 50);
ex2.setModel(new SpinnerNumberModel(0, 0, 6, 1));
ex2.setFont(new Font("Tahoma", Font.PLAIN, 30));
ex3 = new JSpinner();
ex3.setBounds(210, 114, 50, 50);
ex3.setModel(new SpinnerNumberModel(0, 0, 6, 1));
ex3.setFont(new Font("Tahoma", Font.PLAIN, 30));
ex7 = new JSpinner();
ex7.setBounds(210, 175, 50, 50);
ex7.setModel(new SpinnerNumberModel(0, 0, 6, 1));
ex7.setFont(new Font("Tahoma", Font.PLAIN, 30));
ex8 = new JSpinner();
ex8.setBounds(210, 236, 50, 50);
ex8.setModel(new SpinnerNumberModel(0, 0, 6, 1));
ex8.setFont(new Font("Tahoma", Font.PLAIN, 30));
ex5 = new JSpinner();
ex5.setBounds(270, 53, 50, 50);
ex5.setModel(new SpinnerNumberModel(0, 0, 6, 1));
ex5.setFont(new Font("Tahoma", Font.PLAIN, 30));
ex4 = new JSpinner();
ex4.setBounds(270, 114, 50, 50);
ex4.setModel(new SpinnerNumberModel(0, 0, 6, 1));
ex4.setFont(new Font("Tahoma", Font.PLAIN, 30));
ex6 = new JSpinner();
ex6.setBounds(270, 175, 50, 50);
ex6.setModel(new SpinnerNumberModel(0, 0, 6, 1));
ex6.setFont(new Font("Tahoma", Font.PLAIN, 30));
ex1 = new JSpinner();
ex1.setBounds(270, 236, 50, 50);
ex1.setModel(new SpinnerNumberModel(0, 0, 6, 1));
ex1.setFont(new Font("Tahoma", Font.PLAIN, 30));
af2 = new JSpinner();
af2.setBounds(418, 53, 50, 50);
af2.setModel(new SpinnerNumberModel(0, 0, 6, 1));
af2.setFont(new Font("Tahoma", Font.PLAIN, 30));
af4 = new JSpinner();
af4.setBounds(418, 114, 50, 50);
af4.setModel(new SpinnerNumberModel(0, 0, 6, 1));
af4.setFont(new Font("Tahoma", Font.PLAIN, 30));
af6 = new JSpinner();
af6.setBounds(418, 175, 50, 50);
af6.setModel(new SpinnerNumberModel(0, 0, 6, 1));
af6.setFont(new Font("Tahoma", Font.PLAIN, 30));
af8 = new JSpinner();
af8.setBounds(418, 236, 50, 50);
af8.setModel(new SpinnerNumberModel(0, 0, 6, 1));
af8.setFont(new Font("Tahoma", Font.PLAIN, 30));
af3 = new JSpinner();
af3.setBounds(358, 114, 50, 50);
af3.setModel(new SpinnerNumberModel(0, 0, 6, 1));
af3.setFont(new Font("Tahoma", Font.PLAIN, 30));
af1 = new JSpinner();
af1.setBounds(358, 53, 50, 50);
af1.setModel(new SpinnerNumberModel(0, 0, 6, 1));
af1.setFont(new Font("Tahoma", Font.PLAIN, 30));
af5 = new JSpinner();
af5.setBounds(358, 175, 50, 50);
af5.setModel(new SpinnerNumberModel(0, 0, 6, 1));
af5.setFont(new Font("Tahoma", Font.PLAIN, 30));
af7 = new JSpinner();
af7.setBounds(358, 236, 50, 50);
af7.setModel(new SpinnerNumberModel(0, 0, 6, 1));
af7.setFont(new Font("Tahoma", Font.PLAIN, 30));
btnNewButton = new JButton("Note aktualisieren");
btnNewButton.setFont(new Font("Tahoma", Font.PLAIN, 30));
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent paramActionEvent) {
}
});
btnNewButton.setBounds(10, 356, 464, 46);
getContentPane().setLayout(null);
getContentPane().add(lblSchulaufgaben);
getContentPane().add(lblExen);
getContentPane().add(lblAbfragen);
getContentPane().add(sa1);
getContentPane().add(sa5);
getContentPane().add(ex2);
getContentPane().add(ex5);
getContentPane().add(af1);
getContentPane().add(af2);
getContentPane().add(sa2);
getContentPane().add(sa6);
getContentPane().add(ex3);
getContentPane().add(ex4);
getContentPane().add(af3);
getContentPane().add(af4);
getContentPane().add(sa3);
getContentPane().add(sa7);
getContentPane().add(sa4);
getContentPane().add(sa8);
getContentPane().add(ex7);
getContentPane().add(ex6);
getContentPane().add(ex8);
getContentPane().add(ex1);
getContentPane().add(af5);
getContentPane().add(af6);
getContentPane().add(af7);
getContentPane().add(af8);
getContentPane().add(btnNewButton);
lblDeinNotendurchschnitt = new JLabel("Dein Notendurchschnitt:");
lblDeinNotendurchschnitt.setFont(new Font("Tahoma", Font.PLAIN, 30));
lblDeinNotendurchschnitt.setBounds(37, 295, 323, 50);
getContentPane().add(lblDeinNotendurchschnitt);
lblNote = new JLabel("2");
lblNote.setFont(new Font("Tahoma", Font.PLAIN, 30));
lblNote.setBounds(388, 302, 16, 37);
getContentPane().add(lblNote);
}
}
计算器：
package me.imfrozen;
public class rechner {
public static int note = 1;
int a = 0, b = 0, c = 0;
public static double sa_ges = 0;
int sa1 = (Integer) FrameA.sa1.getValue();
int sa2 = (Integer) FrameA.sa2.getValue();
int sa3 = (Integer) FrameA.sa3.getValue();
int sa4 = (Integer) FrameA.sa4.getValue();
int sa5 = (Integer) FrameA.sa5.getValue();
int sa6 = (Integer) FrameA.sa6.getValue();
int sa7 = (Integer) FrameA.sa7.getValue();
int sa8 = (Integer) FrameA.sa8.getValue();
int ex1 = (Integer) FrameA.ex1.getValue();
int ex2 = (Integer) FrameA.ex2.getValue();
int ex3 = (Integer) FrameA.ex3.getValue();
int ex4 = (Integer) FrameA.ex4.getValue();
int ex5 = (Integer) FrameA.ex5.getValue();
int ex6 = (Integer) FrameA.ex6.getValue();
int ex7 = (Integer) FrameA.ex7.getValue();
int ex8 = (Integer) FrameA.ex8.getValue();
int af1 = (Integer) FrameA.af1.getValue();
int af2 = (Integer) FrameA.af2.getValue();
int af3 = (Integer) FrameA.af3.getValue();
int af4 = (Integer) FrameA.af4.getValue();
int af5 = (Integer) FrameA.af5.getValue();
int af6 = (Integer) FrameA.af6.getValue();
int af7 = (Integer) FrameA.af7.getValue();
int af8 = (Integer) FrameA.af8.getValue();
int sa = 0, ex = 0, af = 0, exaf = 0;
{
//SCHULAUFGABEN
if (sa1 >= 1){
a++;
}
if (sa2 >= 1){
a++;
}
if (sa3 >= 1){
a++;
}
if (sa4 >= 1){
a++;
}
if (sa5 >= 1){
a++;
}
if (sa6 >= 1){
a++;
}
if (sa7 >= 1){
a++;
}
if (sa8 >= 1){
a++;
}
//EXEN
if (ex1 >= 1){
b++;
}
if (ex2 >= 1){
b++;
}
if (ex3 >= 1){
b++;
}
if (ex4 >= 1){
b++;
}
if (ex5 >= 1){
b++;
}
if (ex6 >= 1){
b++;
}
if (ex7 >= 1){
b++;
}
if (ex8 >= 1){
b++;
}
//ABFRAGEN
if (af1 >= 1){
c++;
}
if (af2 >= 1){
c++;
}
if (af3 >= 1){
c++;
}
if (af4 >= 1){
c++;
}
if (af5 >= 1){
c++;
}
if (af6 >= 1){
c++;
}
if (af7 >= 1){
c++;
}
if (af8 >= 1){
c++;
}
//AUSRECHNEN
sa = sa1+sa2+sa3+sa4+sa5+sa6+sa7+sa8;
ex = (ex1+ex2+ex3+ex4+ex5+ex6+ex7+ex8) / b;
af = (af1+af2+af3+af4+af5+af6+af7+af8) / c;
exaf = ex + af;
note = (sa + exaf) / a++ ;
}
}