只是平均计算器。那么，你可以与程序推进交互 成绩和选择平均值。首先，我无法让它起作用 意思是，所以我改变它。然后，每次我尝试选择a时都会出错 方法，所以不。然后，该方法将无法正常工作。所以我终于明白了 工作，除了一件事......它不能告诉我平均值。
private JTextField textField_2;
private JTextField textField;
private JTextField textField_1;
private JTextField textField_3;
private JTextField textField_4;
private JTextField textField_5;
private JLabel mostrar;
private double combo, nota1, nota2, nota3, nota4, sem1, sem2, fin, aux1, aux2;
private JRadioButton DosSemestres, CuatroParciales, TresParciales, DosParciales;
private JLabel SelecMetod, LBLMax , LBLMin, lblNota1, lblNota2, lblNota3, lblNota4, lblSem1, lblsem2, lblfinal;
private JButton NotaBoton, Calcular, Elegir;
private JLabel AreaSem1, AreaSem2, AreaPromedioFin;
private JLabel Clasi;
public Panel() {
setLayout(null);
setSize(850, 556);
//metodo de creacion de año electivo
SelecMetod = new JLabel("Seleccione el metodo electivo: ");
DosSemestres = new JRadioButton("1. Dos semestres de dos parciales cada uno");
CuatroParciales = new JRadioButton("2. Cuatro parciales repartidos en un año electivo");
TresParciales = new JRadioButton("3. Tres parciales repartidos en un año electivo");
DosParciales = new JRadioButton("4. Dos parciales repartidos en un año electivo");
ButtonGroup group = new ButtonGroup();
Dimension size1 = DosSemestres.getPreferredSize();
Dimension size2 = CuatroParciales.getPreferredSize();
Dimension size3 = TresParciales.getPreferredSize();
Dimension size4 = DosParciales.getPreferredSize();
SelecMetod.setBounds(20, 5, size1.width, 20);
SelecMetod.setForeground(Color.BLUE);
DosSemestres.setBounds(20, 25, size1.width, 20);
CuatroParciales.setBounds(20, 55, size2.width, 20);
TresParciales.setBounds(20, 85, size3.width, 20);
DosParciales.setBounds(20, 115, size4.width, 20);
group.add(DosSemestres);
group.add(CuatroParciales);
group.add(TresParciales);
group.add(DosParciales);
add(SelecMetod);
add(DosSemestres);
add(CuatroParciales);
add(TresParciales);
add(DosParciales);
DosSemestres.addActionListener(this);
CuatroParciales.addActionListener(this);
TresParciales.addActionListener(this);
DosParciales.addActionListener(this);
//Notas minimas y maximas
LBLMax = new JLabel("Ingrese la nota minima de excelencia academia: ");
LBLMax.setForeground(Color.GREEN);
LBLMin = new JLabel("Ingrese la nota minima para aprobar: ");
LBLMin.setForeground(Color.GREEN);
Dimension Not1 = LBLMax.getPreferredSize();
Dimension Not2 = LBLMin.getPreferredSize();
LBLMax.setBounds(440, 25, Not1.width, 20);
LBLMin.setBounds(440, 90 , Not2.width, 20);
add(LBLMax);
add(LBLMin);
textField = new JTextField("");
textField.setBackground(Color.BLUE);
textField.setForeground(Color.WHITE);
textField_2 = new JTextField("");
textField_2.setBackground(Color.BLUE);
textField_2.setForeground(Color.WHITE);
textField.setBounds(440, 55 , 60, 20);
textField_2.setBounds(440, 120 , 60, 20);
add(textField);
add(textField_2);
mostrar = new JLabel("La nota media es:" );
mostrar.setBounds(440, 140, 180, 30);
add(mostrar);
Elegir = new JButton("Aceptar");
Elegir.setBounds(440, 170, 120, 30);
add(Elegir);
Elegir.addActionListener(this);
//Notas reales
lblNota1 = new JLabel("Ingrese la primera nota:");
lblNota2 = new JLabel("Ingrese la segunda nota:");
lblNota3 = new JLabel("Ingrese la tercera nota:");
lblNota4 = new JLabel("Ingrese la cuarta nota:");
Dimension nota1 = lblNota1.getPreferredSize();
Dimension nota2 = lblNota2.getPreferredSize();
Dimension nota3 = lblNota4.getPreferredSize();
Dimension nota4 = lblNota4.getPreferredSize();
lblNota1.setBounds(30, 220, nota1.width, nota1.height);
lblNota2.setBounds(30, 250, nota2.width, nota2.height);
lblNota3.setBounds(30, 280, 280, nota3.height);
lblNota4.setBounds(30, 310, nota4.width, nota4.height);
textField_1 = new JTextField();
textField_1.setBackground(Color.LIGHT_GRAY);
textField_1.setForeground(Color.BLACK);
textField_1.setBounds(250, 220, 40, 20);
add(textField_1);
textField_3 = new JTextField();
textField_3.setBackground(Color.LIGHT_GRAY);
textField_3.setForeground(Color.BLACK);
textField_3.setBounds(250, 250, 40, 20);
add(textField_3);
textField_4 = new JTextField();
textField_4.setBackground(Color.LIGHT_GRAY);
textField_4.setForeground(Color.BLACK);
textField_4.setBounds(250, 280, 40, 20);
add(textField_4);
textField_4.setVisible(false);
textField_5 = new JTextField();
textField_5.setBackground(Color.LIGHT_GRAY);
textField_5.setForeground(Color.BLACK);
textField_5.setBounds(250, 310, 40, 20);
add(textField_5);
textField_5.setVisible(false);
add(lblNota1);
add(lblNota2);
add(lblNota3);
add(lblNota4);
lblNota3.setVisible(false);
lblNota4.setVisible(false);
//Boton que calculara
Calcular = new JButton("Calcular");
Calcular.setBounds(130, 350 , 160, 40);
add(Calcular);
Calcular.addActionListener(this);
//Promedios
lblSem1 = new JLabel("El promedio del primer semestre es: ");
lblsem2 = new JLabel("El promedio del segundo semestre es: ");
lblSem1.setBounds(440, 220, 240, 40);
add(lblSem1);
lblSem1.setVisible(false);
lblsem2.setBounds(440, 260, 250, 40);
add(lblsem2);
lblsem2.setVisible(false);
AreaSem1 = new JLabel();
AreaSem2 = new JLabel();
AreaSem1.setBounds(520, 220, 80, 50);
AreaSem1.setVisible(false);
add(AreaSem1);
AreaSem2.setBounds(520, 260, 80, 50);
AreaSem2.setVisible(false);
add(AreaSem2);
lblfinal = new JLabel("El promedio final es: ");
lblfinal.setBounds(440, 300, 240, 40);
add(lblfinal);
AreaPromedioFin = new JLabel();
AreaPromedioFin.setBounds(520, 300, 90, 40);
add(AreaPromedioFin);
Clasi = new JLabel();
Clasi.setBackground(Color.BLUE);
Clasi.setBounds(520, 350, 250, 50);
AreaPromedioFin.setBounds(520, 360, 180, 40);
add(Clasi);
}
@Override
public void actionPerformed(ActionEvent e) {
if(e.getSource() == Elegir){
double min = (Double.parseDouble(textField.getText()));
double aprobado = (Double.parseDouble(textField_2.getText()));
double R = ((min + aprobado)/2);
mostrar.setText("La nota media es: "+String.valueOf(R));}
if(e.getSource() == DosSemestres){
lblNota3.setVisible(true);
lblNota4.setVisible(true);
textField_5.setVisible(true);
textField_4.setVisible(true);
lblSem1.setVisible(true);
lblsem2.setVisible(true);
AreaSem1.setVisible(true);
AreaSem2.setVisible(true);
double nota1 = (Double.parseDouble(textField_1.getText()));
double nota2 = (Double.parseDouble(textField_3.getText()));
double sem1 = (nota1+nota2)/2;
double nota3 = (Double.parseDouble(textField_4.getText()));
double nota4 = (Double.parseDouble(textField_5.getText()));
double sem2 = (nota3+nota4)/2;
double fin = (nota1+nota2+nota3+nota4)/4;
if(e.getSource() == Calcular){
AreaSem1.setText(String.valueOf(sem1));
AreaSem2.setText(String.valueOf(sem2));
AreaPromedioFin.setText(String.valueOf(fin));
}
else if(e.getSource() == CuatroParciales){
lblNota3.setVisible(true);
lblNota4.setVisible(true);
textField_5.setVisible(true);
textField_4.setVisible(true);
lblSem1.setVisible(false);
lblsem2.setVisible(false);
AreaSem1.setVisible(false);
AreaSem2.setVisible(false);
double nota1_1 = (Double.parseDouble(textField_1.getText()));
double nota2_1 = (Double.parseDouble(textField_3.getText()));
double nota3_1 = (Double.parseDouble(textField_4.getText()));
double nota4_1 = (Double.parseDouble(textField_5.getText()));
double fin_1 = (nota1+nota2+nota3+nota4)/4;
if(e.getSource() == Calcular){
AreaPromedioFin.setText(String.valueOf(fin));}
}
else if(e.getSource() == TresParciales){
lblNota3.setVisible(true);
lblNota4.setVisible(false);
textField_5.setVisible(false);
textField_4.setVisible(true);
lblSem1.setVisible(false);
lblsem2.setVisible(false);
AreaSem1.setVisible(false);
AreaSem2.setVisible(false);
double nota1_2 = (Double.parseDouble(textField_1.getText()));
double nota2_2 = (Double.parseDouble(textField_3.getText()));
double nota3_2 = (Double.parseDouble(textField_4.getText()));
double fin_2 = (nota1+nota2+nota3)/3;
if(e.getSource() == Calcular){
AreaPromedioFin.setText(String.valueOf(fin));}
}
else if(e.getSource() == DosParciales){
lblNota3.setVisible(false);
lblNota4.setVisible(false);
textField_5.setVisible(false);
textField_4.setVisible(false);
lblSem1.setVisible(false);
lblsem2.setVisible(false);
AreaSem1.setVisible(false);
AreaSem2.setVisible(false);
double nota1_3 = (Double.parseDouble(textField_1.getText()));
double nota2_3 = (Double.parseDouble(textField_3.getText()));
double fin_3 = (nota1+nota2)/2;
if(e.getSource() == Calcular){
AreaPromedioFin.setText(String.valueOf(fin));}
}
}
}
}
答案 0 :(得分：3)
double nota1 = (Double.parseDouble(textField_1.getText()));会导致潜在java.lang.NumberFormatException。您应该使用textField_1.getText().isEmpty()检查字段是否包含任何文本。如果用户输入无效值，您还应该捕获NumberFormatException。
JFormattedTextField或JSpinner有助于减少一些问题。有关详细信息，请查看How to Use Formatted Text Fields和How to Use Spinners。
当用户选择1. Dos semestres de dos parciales cada uno时，您会显示新字段，但在用户输入任何内容之前，您会尝试处理这些字段，这会进一步导致NumberFormatException
以下......
if (e.getSource() == DosSemestres) {
//...
if (e.getSource() == Calcular) {
永远不会奏效。该事件只能有一个来源，因此它可以是DosSemestres或Calcular，但不能同时为两个。这似乎是您问题的重要来源，以及之前的评论。
避免使用null布局，像素完美布局是现代ui设计中的一种幻觉。影响组件个体大小的因素太多，您无法控制。 Swing旨在与布局管理器一起工作，放弃这些将导致问题和问题的终结，您将花费越来越多的时间来纠正
您可能还希望阅读Code Conventions for the Java TM Programming Language，这样可以让人们更轻松地阅读您的代码并让您阅读其他代码