这是我的决赛代码。评分系统的评分均为24 JComboBox。一些数字直到10,20和30.每个季度它们被计算并显示在JTextfield中。当四个季度完成时，Jbutton“全部计算”计算整个数据，并在另一个框架中显示学生的成绩和天气，他或她已通过或失败。这段代码适用于一些问题：（1）我的Jbutton“CLEAR ALL”不起作用。它应该在单击时显示默认数字“0”并且Jtextfields必须为空 - （这已经工作“TEXTFIELD TO EMPTY”。（2）我想隐藏第一帧时单击Jbutton for compute all（f2.hide （）; f3.show（）;）但它一直说（找不到符号符号：变量f2找不到符号）（3）最后在我的第3帧中显示了学生的最终成绩和最终评分我真的没有显示在一个消息对话框中说明他或她通过或失败的天气。感谢。抱歉编码不好。
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class forfinals extends JFrame{
JFrame f1 = new JFrame ("HELLO");
JLabel Lb1 = new JLabel ("Enter your name");
JLabel Lb2 = new JLabel ("QUIZZES (20)");
JLabel Lb3 = new JLabel ("ASSIGNMENTS (10)");
JLabel Lb4 = new JLabel ("PROJECTS (20)");
JLabel Lb5 = new JLabel ("PARTICIPATION (10)");
JLabel Lb6 = new JLabel ("ATTENDANCE(10)");
JLabel Lb7 = new JLabel ("MAJOR EXAM (30)");
JLabel Lb8 = new JLabel ("Western College SY: 2011-2012");
JLabel Lb9 = new JLabel ("Final Grade");
JLabel Lb10 = new JLabel ("PRELIM");
JLabel Lb11 = new JLabel ("MIDTERM");
JLabel Lb12 = new JLabel ("PREFINAL");
JLabel Lb13 = new JLabel ("FINALS");
JLabel label1 = new JLabel ("YOUR FINAL GRADE");
JLabel label2 = new JLabel ("YOU EARNED THE RATING");
JTextField txt1 = new JTextField (15);
JTextField txt2 = new JTextField (2);
JTextField txt3 = new JTextField (2);
JTextField txt4 = new JTextField (2);
JTextField txt5 = new JTextField (2);
JTextField finalg = new JTextField (5);
JTextField finalr = new JTextField (5);
JButton Btn1 = new JButton ("OK");
JButton Btn2 = new JButton ("CANCEL");
JButton Btn3 = new JButton ("COMPUTE");
JButton Btn4 = new JButton ("COMPUTE");
JButton Btn5 = new JButton ("COMPUTE");
JButton Btn6 = new JButton ("COMPUTE");
JButton jcompute = new JButton ("COMPUTE ALL");
JButton jclear = new JButton ("CLEAR ALL");
JButton jexit = new JButton ("EXIT");
JButton finalb = new JButton ("OK");
//prelim
JComboBox cb1 = new JComboBox();
JComboBox cb2 = new JComboBox();
JComboBox cb3 = new JComboBox();
JComboBox cb4 = new JComboBox();
JComboBox cb5 = new JComboBox();
JComboBox cb6 = new JComboBox();
//midterm
JComboBox cb7 = new JComboBox();
JComboBox cb8 = new JComboBox();
JComboBox cb9 = new JComboBox();
JComboBox cb10 = new JComboBox();
JComboBox cb11 = new JComboBox();
JComboBox cb12 = new JComboBox();
//prefinal
JComboBox cb13 = new JComboBox();
JComboBox cb14 = new JComboBox();
JComboBox cb15 = new JComboBox();
JComboBox cb16 = new JComboBox();
JComboBox cb17 = new JComboBox();
JComboBox cb18 = new JComboBox();
//finals
JComboBox cb19 = new JComboBox();
JComboBox cb20 = new JComboBox();
JComboBox cb21 = new JComboBox();
JComboBox cb22 = new JComboBox();
JComboBox cb23 = new JComboBox();
JComboBox cb24 = new JComboBox();
public forfinals(){
f1.getContentPane().setLayout(null);
f1.setSize (300,350);
f1.getContentPane().add(Lb1);
f1.getContentPane().add(txt1);
f1.getContentPane().add(Btn1);
f1.getContentPane().add(Btn2);
Lb1.setBounds(40,70,100,75);
txt1.setBounds(150,90,100,30);
Btn1.setBounds(40,170,100,40);
Btn2.setBounds(150,170,100,40);
Btn1.addActionListener(new ActionListener(){
public void actionPerformed (ActionEvent e){
String x;
x = txt1.getText();
JFrame f2 = new JFrame (x);
f2.getContentPane().setLayout(null);
f2.setSize (830,600);
f1.hide();
f2.show();
f2.getContentPane().add(Lb2);
f2.getContentPane().add(Lb3);
f2.getContentPane().add(Lb4);
f2.getContentPane().add(Lb5);
f2.getContentPane().add(Lb6);
f2.getContentPane().add(Lb7);
f2.getContentPane().add(Lb8);
f2.getContentPane().add(Lb9);
f2.getContentPane().add(Lb10);
f2.getContentPane().add(Lb11);
f2.getContentPane().add(Lb12);
f2.getContentPane().add(Lb13);
f2.getContentPane().add(jcompute);
f2.getContentPane().add(jclear);
f2.getContentPane().add(jexit);
Lb2.setBounds(30,120,90,70);
Lb3.setBounds(30,170,110,70);
Lb4.setBounds(30,220,90,70);
Lb5.setBounds(30,270,120,70);
Lb6.setBounds(30,320,100,70);
Lb7.setBounds(30,370,110,70);
Lb8.setBounds(280,20,230,20);
Lb9.setBounds(30,420,80,70);
Lb10.setBounds(190,60,100,100);
Lb11.setBounds(315,60,100,100);
Lb12.setBounds(440,60,100,100);
Lb13.setBounds(570,60,100,100);
jcompute.setBounds(660,160,120, 60);
jclear.setBounds(660,260,120, 60);
jexit.setBounds(660,360,120,60);
//PRELIM
f2.getContentPane().add(cb1);
f2.getContentPane().add(cb2);
f2.getContentPane().add(cb3);
f2.getContentPane().add(cb4);
f2.getContentPane().add(cb5);
f2.getContentPane().add(cb6);
f2.getContentPane().add(Btn3);
f2.getContentPane().add(txt2);
txt2.setEditable(false);
cb1.setBounds(190,140,50,30);
cb2.setBounds(190,190,50,30);
cb3.setBounds(190,240,50,30);
cb4.setBounds(190,290,50,30);
cb5.setBounds(190,340,50,30);
cb6.setBounds(190,390,50,30);
Btn3.setBounds(170,490,95,40);
txt2.setBounds(190,440,55,35);
int numbers_to_add_max = 10;
for (int i = 0; i <= numbers_to_add_max; i++) {
cb2.addItem(new Integer(i));
cb4.addItem(new Integer(i));
cb5.addItem(new Integer(i));
}
int numbers = 20;
for (int i = 0; i <= numbers; i++) {
cb1.addItem(new Integer(i));
cb3.addItem(new Integer(i));
}
int numbers_to_add = 30;
for (int i = 0; i <= numbers_to_add; i++) {
cb6.addItem(new Integer(i));
}
//MIDTERM
f2.getContentPane().add(cb7);
f2.getContentPane().add(cb8);
f2.getContentPane().add(cb9);
f2.getContentPane().add(cb10);
f2.getContentPane().add(cb11);
f2.getContentPane().add(cb12);
f2.getContentPane().add(Btn4);
f2.getContentPane().add(txt3);
txt3.setEditable(false);
cb7.setBounds(315,140,50,30);
cb8.setBounds(315,190,50,30);
cb9.setBounds(315,240,50,30);
cb10.setBounds(315,290,50,30);
cb11.setBounds(315,340,50,30);
cb12.setBounds(315,390,50,30);
Btn4.setBounds(295,490,95,40);
txt3.setBounds(315,440,55,35);
int nu = 10;
for (int i = 0; i <= nu; i++) {
cb8.addItem(new Integer(i));
cb10.addItem(new Integer(i));
cb11.addItem(new Integer(i));
}
int num = 20;
for (int i = 0; i <= num; i++) {
cb7.addItem(new Integer(i));
cb9.addItem(new Integer(i));
}
int numb = 30;
for (int i = 0; i <= numb; i++) {
cb12.addItem(new Integer(i));
}
//PREFINAL
f2.getContentPane().add(cb13);
f2.getContentPane().add(cb14);
f2.getContentPane().add(cb15);
f2.getContentPane().add(cb16);
f2.getContentPane().add(cb17);
f2.getContentPane().add(cb18);
f2.getContentPane().add(Btn5);
f2.getContentPane().add(txt4);
txt4.setEditable(false);
cb13.setBounds(440,140,50,30);
cb14.setBounds(440,190,50,30);
cb15.setBounds(440,240,50,30);
cb16.setBounds(440,290,50,30);
cb17.setBounds(440,340,50,30);
cb18.setBounds(440,390,50,30);
Btn5.setBounds(420,490,95,40);
txt4.setBounds(440,440,55,35);
int toaddmax = 10;
for (int i = 0; i <= toaddmax; i++) {
cb14.addItem(new Integer(i));
cb16.addItem(new Integer(i));
cb17.addItem(new Integer(i));
}
int numbersadd = 20;
for (int i = 0; i <= numbersadd; i++) {
cb13.addItem(new Integer(i));
cb15.addItem(new Integer(i));
}
int numbers_toadd = 30;
for (int i = 0; i <= numbers_toadd; i++) {
cb18.addItem(new Integer(i));
}
//FINALS
f2.getContentPane().add(cb19);
f2.getContentPane().add(cb20);
f2.getContentPane().add(cb21);
f2.getContentPane().add(cb22);
f2.getContentPane().add(cb23);
f2.getContentPane().add(cb24);
f2.getContentPane().add(Btn6);
f2.getContentPane().add(txt5);
txt5.setEditable(false);
cb19.setBounds(565,140,50,30);
cb20.setBounds(565,190,50,30);
cb21.setBounds(565,240,50,30);
cb22.setBounds(565,290,50,30);
cb23.setBounds(565,340,50,30);
cb24.setBounds(565,390,50,30);
Btn6.setBounds(545,490,95,40);
txt5.setBounds(565,440,55,35);
int add_max = 10;
for (int i = 0; i <= add_max; i++) {
cb20.addItem(new Integer(i));
cb22.addItem(new Integer(i));
cb23.addItem(new Integer(i));
}
int number = 20;
for (int i = 0; i <= number; i++) {
cb19.addItem(new Integer(i));
cb21.addItem(new Integer(i));
}
int to_add = 30;
for (int i = 0; i <= to_add; i++) {
cb24.addItem(new Integer(i));
}
}
});
Btn2.addActionListener(new ActionListener(){
public void actionPerformed (ActionEvent e){
System.exit(0);
}
});
Btn3.addActionListener(new ActionListener(){
public void actionPerformed (ActionEvent e){
int cb1Int = Integer.parseInt(cb1.getSelectedItem().toString());
int cb2Int = Integer.parseInt(cb2.getSelectedItem().toString());
int cb3Int = Integer.parseInt(cb3.getSelectedItem().toString());
int cb4Int = Integer.parseInt(cb4.getSelectedItem().toString());
int cb5Int = Integer.parseInt(cb5.getSelectedItem().toString());
int cb6Int = Integer.parseInt(cb6.getSelectedItem().toString());
txt2.setText(String.valueOf(cb1Int + cb2Int + cb3Int + cb4Int + cb5Int + cb6Int));
}
});
Btn4.addActionListener(new ActionListener(){
public void actionPerformed (ActionEvent e){
int cb7Int = Integer.parseInt(cb7.getSelectedItem().toString());
int cb8Int = Integer.parseInt(cb8.getSelectedItem().toString());
int cb9Int = Integer.parseInt(cb9.getSelectedItem().toString());
int cb10Int = Integer.parseInt(cb10.getSelectedItem().toString());
int cb11Int = Integer.parseInt(cb11.getSelectedItem().toString());
int cb12Int = Integer.parseInt(cb12.getSelectedItem().toString());
txt3.setText(String.valueOf(cb7Int + cb8Int + cb9Int + cb10Int + cb11Int + cb12Int));
}
});
Btn5.addActionListener(new ActionListener(){
public void actionPerformed (ActionEvent e){
int cb13Int = Integer.parseInt(cb13.getSelectedItem().toString());
int cb14Int = Integer.parseInt(cb14.getSelectedItem().toString());
int cb15Int = Integer.parseInt(cb15.getSelectedItem().toString());
int cb16Int = Integer.parseInt(cb16.getSelectedItem().toString());
int cb17Int = Integer.parseInt(cb17.getSelectedItem().toString());
int cb18Int = Integer.parseInt(cb18.getSelectedItem().toString());
txt4.setText(String.valueOf(cb13Int + cb14Int + cb15Int + cb16Int + cb17Int + cb18Int));
}
});
Btn6.addActionListener(new ActionListener(){
public void actionPerformed (ActionEvent e){
int cb19Int = Integer.parseInt(cb19.getSelectedItem().toString());
int cb20Int = Integer.parseInt(cb20.getSelectedItem().toString());
int cb21Int = Integer.parseInt(cb21.getSelectedItem().toString());
int cb22Int = Integer.parseInt(cb22.getSelectedItem().toString());
int cb23Int = Integer.parseInt(cb23.getSelectedItem().toString());
int cb24Int = Integer.parseInt(cb24.getSelectedItem().toString());
txt5.setText(String.valueOf(cb19Int + cb20Int + cb21Int + cb22Int + cb23Int + cb24Int));
}
});
jcompute.addActionListener(new ActionListener(){
public void actionPerformed (ActionEvent e){
String prelim, midterm, prefinal, finals, total;
double a, b, c, d, tg;
prelim = txt2.getText();
midterm = txt3.getText();
prefinal = txt4.getText();
finals = txt5.getText();
a = Double.parseDouble(prelim);
b = Double.parseDouble(midterm);
c = Double.parseDouble(prefinal);
d = Double.parseDouble(finals);
tg = (a + b + c + d)/4;
total = Double.toString(tg);
finalg.setText(total);
JFrame f3 = new JFrame ("STUDENT FINAL RATING");
f3.getContentPane().setLayout(null);
f3.setSize (350,300);
//the frame2 (f2); the two frames are still visible
f2.hide();
f3.show();
f3.getContentPane().add(label1);
f3.getContentPane().add(label2);
f3.getContentPane().add(finalg);
finalg.setEditable(false);
f3.getContentPane().add(finalr);
finalr.setEditable(false);
f3.getContentPane().add(finalb);
label1.setBounds(70,20,150,70);
label2.setBounds(90,70,200,70);
finalg.setBounds(205,40,50,30);
finalr.setBounds(140,140,50,40);
finalb.setBounds(130,200,70,30);
//EQUIVALENT
double grade, equiv;
grade = Double.parseDouble(finalg.getText());
if(grade>=99.50 && grade<101)
equiv = 1.00;
else if(grade<99.50 && grade>=98.50)
equiv = 1.10;
else if(grade<98.50 && grade>=97.50)
equiv = 1.20;
else if(grade<97.50 && grade>=96.50)
equiv = 1.30;
else if(grade<96.50 && grade>=95.50)
equiv = 1.40;
else if(grade<95.50 && grade>=94.50)
equiv = 1.50;
else if(grade<94.50 && grade>=93.50)
equiv = 1.60;
else if(grade<93.50 && grade>=92.50)
equiv = 1.70;
else if(grade<92.50 && grade>=91.50)
equiv = 1.80;
else if(grade<91.50 && grade>=90.50)
equiv = 1.90;
else if(grade<90.50 && grade>=89.50)
equiv = 2.00;
else if(grade<89.50 && grade>=88.50)
equiv = 2.10;
else if(grade<88.50 && grade>=87.50)
equiv = 2.20;
else if(grade<87.50 && grade>=86.50)
equiv = 2.30;
else if(grade<86.50 && grade>=85.50)
equiv = 2.40;
else if(grade<85.50 && grade>=84.50)
equiv = 2.50;
else if(grade<84.50 && grade>=83.50)
equiv = 2.60;
else if(grade<83.50 && grade>=82.50)
equiv = 2.70;
else if(grade<82.50 && grade>=81.50)
equiv = 2.80;
else if(grade<81.50 && grade>=80.50)
equiv = 2.90;
else if(grade<80.50 && grade>=79.50)
equiv = 3.00;
else if(grade<79.50 && grade>=78.50)
equiv = 3.10;
else if(grade<78.50 && grade>=77.50)
equiv = 3.20;
else if(grade<77.50 && grade>=76.50)
equiv = 3.30;
else if(grade<76.50 && grade>=75.50)
equiv = 3.40;
else if(grade<75.50 && grade>=74.50)
equiv = 3.50;
else
equiv = 5.0;
finalr.setText("" + equiv);
finalr.setEditable(false);
}
});
finalb.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
JOptionPane.showMessageDialog（null，“”+ equiv）; if（equi> = 1.00 && equiv <= 3.0）JOptionPane.showMessageDialog（null，“你PASSED！”）; 'else if（equiv> = 3.10 && equiv <= 75）JOptionPane.showMessageDialog（null，“YOU FAILED！”）; }};
jclear.addActionListener(new ActionListener(){
public void actionPerformed (ActionEvent e){
//这部分不起作用即使点击了“CLEAR ALL”按钮，JComboBox仍然包含初始化的数字cb1.setSelectedItem（“0”）; cb2.setSelectedItem（ “0”）; cb3.setSelectedItem（ “0”）; cb4.setSelectedItem（ “0”）; cb5.setSelectedItem（ “0”）; cb6.setSelectedItem（ “0”）; cb7.setSelectedItem（ “0”）; cb8.setSelectedItem（ “0”）; cb9.setSelectedItem（ “0”）; cb10.setSelectedItem（ “0”）; cb11.setSelectedItem（ “0”）; cb12.setSelectedItem（ “0”）; cb13.setSelectedItem（ “0”）; cb14.setSelectedItem（ “0”）; cb15.setSelectedItem（ “0”）; cb16.setSelectedItem（ “0”）; cb17.setSelectedItem（ “0”）; cb18.setSelectedItem（ “0”）; cb19.setSelectedItem（ “0”）; cb20.setSelectedItem（ “0”）; cb21.setSelectedItem（ “0”）; cb22.setSelectedItem（ “0”）; cb23.setSelectedItem（ “0”）; cb24.setSelectedItem（ “0”）;
txt2.setText(" ");
txt3.setText(" ");
txt4.setText(" ");
txt5.setText(" ");
}
});
jexit.addActionListener(new ActionListener(){
public void actionPerformed (ActionEvent e){
System.exit(0);
}
});
f1.show();
}
public static void main (String args []){
forfinals xx = new forfinals();
}
}
这是完整的更正代码，
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class forfinals extends JFrame{
JFrame f1 = new JFrame ("HELLO");
JFrame f2 = new JFrame();
double grade, equiv;
JLabel Lb1 = new JLabel ("Enter your name");
JLabel Lb2 = new JLabel ("QUIZZES (20)");
JLabel Lb3 = new JLabel ("ASSIGNMENTS (10)");
JLabel Lb4 = new JLabel ("PROJECTS (20)");
JLabel Lb5 = new JLabel ("PARTICIPATION (10)");
JLabel Lb6 = new JLabel ("ATTENDANCE(10)");
JLabel Lb7 = new JLabel ("MAJOR EXAM (30)");
JLabel Lb8 = new JLabel ("Western College SY: 2011-2012");
JLabel Lb9 = new JLabel ("Final Grade");
JLabel Lb10 = new JLabel ("PRELIM");
JLabel Lb11 = new JLabel ("MIDTERM");
JLabel Lb12 = new JLabel ("PREFINAL");
JLabel Lb13 = new JLabel ("FINALS");
JLabel label1 = new JLabel ("YOUR FINAL GRADE");
JLabel label2 = new JLabel ("YOU EARNED THE RATING");
JTextField txt1 = new JTextField (15);
JTextField txt2 = new JTextField (2);
JTextField txt3 = new JTextField (2);
JTextField txt4 = new JTextField (2);
JTextField txt5 = new JTextField (2);
JTextField finalg = new JTextField (5);
JTextField finalr = new JTextField (5);
JButton Btn1 = new JButton ("OK");
JButton Btn2 = new JButton ("CANCEL");
JButton Btn3 = new JButton ("COMPUTE");
JButton Btn4 = new JButton ("COMPUTE");
JButton Btn5 = new JButton ("COMPUTE");
JButton Btn6 = new JButton ("COMPUTE");
JButton jcompute = new JButton ("COMPUTE ALL");
JButton jclear = new JButton ("CLEAR ALL");
JButton jexit = new JButton ("EXIT");
JButton finalb = new JButton ("OK");
//prelim
JComboBox cb1 = new JComboBox();
JComboBox cb2 = new JComboBox();
JComboBox cb3 = new JComboBox();
JComboBox cb4 = new JComboBox();
JComboBox cb5 = new JComboBox();
JComboBox cb6 = new JComboBox();
//midterm
JComboBox cb7 = new JComboBox();
JComboBox cb8 = new JComboBox();
JComboBox cb9 = new JComboBox();
JComboBox cb10 = new JComboBox();
JComboBox cb11 = new JComboBox();
JComboBox cb12 = new JComboBox();
//prefinal
JComboBox cb13 = new JComboBox();
JComboBox cb14 = new JComboBox();
JComboBox cb15 = new JComboBox();
JComboBox cb16 = new JComboBox();
JComboBox cb17 = new JComboBox();
JComboBox cb18 = new JComboBox();
//finals
JComboBox cb19 = new JComboBox();
JComboBox cb20 = new JComboBox();
JComboBox cb21 = new JComboBox();
JComboBox cb22 = new JComboBox();
JComboBox cb23 = new JComboBox();
JComboBox cb24 = new JComboBox();
public forfinals(){
f1.getContentPane().setLayout(null);
f1.setSize (300,350);
f1.getContentPane().add(Lb1);
f1.getContentPane().add(txt1);
f1.getContentPane().add(Btn1);
f1.getContentPane().add(Btn2);
Lb1.setBounds(40,70,100,75);
txt1.setBounds(150,90,100,30);
Btn1.setBounds(40,170,100,40);
Btn2.setBounds(150,170,100,40);
Btn1.addActionListener(new ActionListener(){
public void actionPerformed (ActionEvent e){
String x;
x = txt1.getText();
f2.setTitle(x);
f2.getContentPane().setLayout(null);
f2.setSize (830,600);
f1.hide();
f2.show();
f2.getContentPane().add(Lb2);
f2.getContentPane().add(Lb3);
f2.getContentPane().add(Lb4);
f2.getContentPane().add(Lb5);
f2.getContentPane().add(Lb6);
f2.getContentPane().add(Lb7);
f2.getContentPane().add(Lb8);
f2.getContentPane().add(Lb9);
f2.getContentPane().add(Lb10);
f2.getContentPane().add(Lb11);
f2.getContentPane().add(Lb12);
f2.getContentPane().add(Lb13);
f2.getContentPane().add(jcompute);
f2.getContentPane().add(jclear);
f2.getContentPane().add(jexit);
Lb2.setBounds(30,120,90,70);
Lb3.setBounds(30,170,110,70);
Lb4.setBounds(30,220,90,70);
Lb5.setBounds(30,270,120,70);
Lb6.setBounds(30,320,100,70);
Lb7.setBounds(30,370,110,70);
Lb8.setBounds(280,20,230,20);
Lb9.setBounds(30,420,80,70);
Lb10.setBounds(190,60,100,100);
Lb11.setBounds(315,60,100,100);
Lb12.setBounds(440,60,100,100);
Lb13.setBounds(570,60,100,100);
jcompute.setBounds(660,160,120, 60);
jclear.setBounds(660,260,120, 60);
jexit.setBounds(660,360,120,60);
//PRELIM
f2.getContentPane().add(cb1);
f2.getContentPane().add(cb2);
f2.getContentPane().add(cb3);
f2.getContentPane().add(cb4);
f2.getContentPane().add(cb5);
f2.getContentPane().add(cb6);
f2.getContentPane().add(Btn3);
f2.getContentPane().add(txt2);
txt2.setEditable(false);
cb1.setBounds(190,140,50,30);
cb2.setBounds(190,190,50,30);
cb3.setBounds(190,240,50,30);
cb4.setBounds(190,290,50,30);
cb5.setBounds(190,340,50,30);
cb6.setBounds(190,390,50,30);
Btn3.setBounds(170,490,95,40);
txt2.setBounds(190,440,55,35);
int numbers_to_add_max = 10;
for (int i = 0; i <= numbers_to_add_max; i++) {
cb2.addItem(new Integer(i));
cb4.addItem(new Integer(i));
cb5.addItem(new Integer(i));
}
int numbers = 20;
for (int i = 0; i <= numbers; i++) {
cb1.addItem(new Integer(i));
cb3.addItem(new Integer(i));
}
int numbers_to_add = 30;
for (int i = 0; i <= numbers_to_add; i++) {
cb6.addItem(new Integer(i));
}
//MIDTERM
f2.getContentPane().add(cb7);
f2.getContentPane().add(cb8);
f2.getContentPane().add(cb9);
f2.getContentPane().add(cb10);
f2.getContentPane().add(cb11);
f2.getContentPane().add(cb12);
f2.getContentPane().add(Btn4);
f2.getContentPane().add(txt3);
txt3.setEditable(false);
cb7.setBounds(315,140,50,30);
cb8.setBounds(315,190,50,30);
cb9.setBounds(315,240,50,30);
cb10.setBounds(315,290,50,30);
cb11.setBounds(315,340,50,30);
cb12.setBounds(315,390,50,30);
Btn4.setBounds(295,490,95,40);
txt3.setBounds(315,440,55,35);
int nu = 10;
for (int i = 0; i <= nu; i++) {
cb8.addItem(new Integer(i));
cb10.addItem(new Integer(i));
cb11.addItem(new Integer(i));
}
int num = 20;
for (int i = 0; i <= num; i++) {
cb7.addItem(new Integer(i));
cb9.addItem(new Integer(i));
}
int numb = 30;
for (int i = 0; i <= numb; i++) {
cb12.addItem(new Integer(i));
}
//PREFINAL
f2.getContentPane().add(cb13);
f2.getContentPane().add(cb14);
f2.getContentPane().add(cb15);
f2.getContentPane().add(cb16);
f2.getContentPane().add(cb17);
f2.getContentPane().add(cb18);
f2.getContentPane().add(Btn5);
f2.getContentPane().add(txt4);
txt4.setEditable(false);
cb13.setBounds(440,140,50,30);
cb14.setBounds(440,190,50,30);
cb15.setBounds(440,240,50,30);
cb16.setBounds(440,290,50,30);
cb17.setBounds(440,340,50,30);
cb18.setBounds(440,390,50,30);
Btn5.setBounds(420,490,95,40);
txt4.setBounds(440,440,55,35);
int toaddmax = 10;
for (int i = 0; i <= toaddmax; i++) {
cb14.addItem(new Integer(i));
cb16.addItem(new Integer(i));
cb17.addItem(new Integer(i));
}
int numbersadd = 20;
for (int i = 0; i <= numbersadd; i++) {
cb13.addItem(new Integer(i));
cb15.addItem(new Integer(i));
}
int numbers_toadd = 30;
for (int i = 0; i <= numbers_toadd; i++) {
cb18.addItem(new Integer(i));
}
//FINALS
f2.getContentPane().add(cb19);
f2.getContentPane().add(cb20);
f2.getContentPane().add(cb21);
f2.getContentPane().add(cb22);
f2.getContentPane().add(cb23);
f2.getContentPane().add(cb24);
f2.getContentPane().add(Btn6);
f2.getContentPane().add(txt5);
txt5.setEditable(false);
cb19.setBounds(565,140,50,30);
cb20.setBounds(565,190,50,30);
cb21.setBounds(565,240,50,30);
cb22.setBounds(565,290,50,30);
cb23.setBounds(565,340,50,30);
cb24.setBounds(565,390,50,30);
Btn6.setBounds(545,490,95,40);
txt5.setBounds(565,440,55,35);
int add_max = 10;
for (int i = 0; i <= add_max; i++) {
cb20.addItem(new Integer(i));
cb22.addItem(new Integer(i));
cb23.addItem(new Integer(i));
}
int number = 20;
for (int i = 0; i <= number; i++) {
cb19.addItem(new Integer(i));
cb21.addItem(new Integer(i));
}
int to_add = 30;
for (int i = 0; i <= to_add; i++) {
cb24.addItem(new Integer(i));
}
}
});
Btn2.addActionListener(new ActionListener(){
public void actionPerformed (ActionEvent e){
System.exit(0);
}
});
Btn3.addActionListener(new ActionListener(){
public void actionPerformed (ActionEvent e){
int cb1Int = Integer.parseInt(cb1.getSelectedItem().toString());
int cb2Int = Integer.parseInt(cb2.getSelectedItem().toString());
int cb3Int = Integer.parseInt(cb3.getSelectedItem().toString());
int cb4Int = Integer.parseInt(cb4.getSelectedItem().toString());
int cb5Int = Integer.parseInt(cb5.getSelectedItem().toString());
int cb6Int = Integer.parseInt(cb6.getSelectedItem().toString());
txt2.setText(String.valueOf(cb1Int + cb2Int + cb3Int + cb4Int + cb5Int + cb6Int));
}
});
Btn4.addActionListener(new ActionListener(){
public void actionPerformed (ActionEvent e){
int cb7Int = Integer.parseInt(cb7.getSelectedItem().toString());
int cb8Int = Integer.parseInt(cb8.getSelectedItem().toString());
int cb9Int = Integer.parseInt(cb9.getSelectedItem().toString());
int cb10Int = Integer.parseInt(cb10.getSelectedItem().toString());
int cb11Int = Integer.parseInt(cb11.getSelectedItem().toString());
int cb12Int = Integer.parseInt(cb12.getSelectedItem().toString());
txt3.setText(String.valueOf(cb7Int + cb8Int + cb9Int + cb10Int + cb11Int + cb12Int));
}
});
Btn5.addActionListener(new ActionListener(){
public void actionPerformed (ActionEvent e){
int cb13Int = Integer.parseInt(cb13.getSelectedItem().toString());
int cb14Int = Integer.parseInt(cb14.getSelectedItem().toString());
int cb15Int = Integer.parseInt(cb15.getSelectedItem().toString());
int cb16Int = Integer.parseInt(cb16.getSelectedItem().toString());
int cb17Int = Integer.parseInt(cb17.getSelectedItem().toString());
int cb18Int = Integer.parseInt(cb18.getSelectedItem().toString());
txt4.setText(String.valueOf(cb13Int + cb14Int + cb15Int + cb16Int + cb17Int + cb18Int));
}
});
Btn6.addActionListener(new ActionListener(){
public void actionPerformed (ActionEvent e){
int cb19Int = Integer.parseInt(cb19.getSelectedItem().toString());
int cb20Int = Integer.parseInt(cb20.getSelectedItem().toString());
int cb21Int = Integer.parseInt(cb21.getSelectedItem().toString());
int cb22Int = Integer.parseInt(cb22.getSelectedItem().toString());
int cb23Int = Integer.parseInt(cb23.getSelectedItem().toString());
int cb24Int = Integer.parseInt(cb24.getSelectedItem().toString());
txt5.setText(String.valueOf(cb19Int + cb20Int + cb21Int + cb22Int + cb23Int + cb24Int));
}
});
jcompute.addActionListener(new ActionListener(){
public void actionPerformed (ActionEvent e){
String prelim, midterm, prefinal, finals, total;
double a, b, c, d, tg;
prelim = txt2.getText();
midterm = txt3.getText();
prefinal = txt4.getText();
finals = txt5.getText();
a = Double.parseDouble(prelim);
b = Double.parseDouble(midterm);
c = Double.parseDouble(prefinal);
d = Double.parseDouble(finals);
tg = (a + b + c + d)/4;
total = Double.toString(tg);
finalg.setText(total);
JFrame f3 = new JFrame ("STUDENT FINAL RATING");
f3.getContentPane().setLayout(null);
f3.setSize (350,300);
//the frame2 (f2); the two frames are still visible
f2.hide();
f3.show();
f3.getContentPane().add(label1);
f3.getContentPane().add(label2);
f3.getContentPane().add(finalg);
finalg.setEditable(false);
f3.getContentPane().add(finalr);
finalr.setEditable(false);
f3.getContentPane().add(finalb);
label1.setBounds(70,20,150,70);
label2.setBounds(90,70,200,70);
finalg.setBounds(205,40,50,30);
finalr.setBounds(140,140,50,40);
finalb.setBounds(130,200,70,30);
//EQUIVALENT
grade = Double.parseDouble(finalg.getText());
if(grade>=99.50 && grade<101)
equiv = 1.00;
else if(grade<99.50 && grade>=98.50)
equiv = 1.10;
else if(grade<98.50 && grade>=97.50)
equiv = 1.20;
else if(grade<97.50 && grade>=96.50)
equiv = 1.30;
else if(grade<96.50 && grade>=95.50)
equiv = 1.40;
else if(grade<95.50 && grade>=94.50)
equiv = 1.50;
else if(grade<94.50 && grade>=93.50)
equiv = 1.60;
else if(grade<93.50 && grade>=92.50)
equiv = 1.70;
else if(grade<92.50 && grade>=91.50)
equiv = 1.80;
else if(grade<91.50 && grade>=90.50)
equiv = 1.90;
else if(grade<90.50 && grade>=89.50)
equiv = 2.00;
else if(grade<89.50 && grade>=88.50)
equiv = 2.10;
else if(grade<88.50 && grade>=87.50)
equiv = 2.20;
else if(grade<87.50 && grade>=86.50)
equiv = 2.30;
else if(grade<86.50 && grade>=85.50)
equiv = 2.40;
else if(grade<85.50 && grade>=84.50)
equiv = 2.50;
else if(grade<84.50 && grade>=83.50)
equiv = 2.60;
else if(grade<83.50 && grade>=82.50)
equiv = 2.70;
else if(grade<82.50 && grade>=81.50)
equiv = 2.80;
else if(grade<81.50 && grade>=80.50)
equiv = 2.90;
else if(grade<80.50 && grade>=79.50)
equiv = 3.00;
else if(grade<79.50 && grade>=78.50)
equiv = 3.10;
else if(grade<78.50 && grade>=77.50)
equiv = 3.20;
else if(grade<77.50 && grade>=76.50)
equiv = 3.30;
else if(grade<76.50 && grade>=75.50)
equiv = 3.40;
else if(grade<75.50 && grade>=74.50)
equiv = 3.50;
else
equiv = 5.0;
finalr.setText("" + equiv);
finalr.setEditable(false);
}
});
finalb.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(null, "" + equiv);
if (equiv >=1.00 && equiv <=3.0) JOptionPane.showMessageDialog(null, " YOU PASSED!");
else if (equiv >=3.10 && equiv <=75) JOptionPane.showMessageDialog(null, " YOU FAILED!");
}
});
jclear.addActionListener(new ActionListener(){
public void actionPerformed (ActionEvent e){
cb1.setSelectedItem(Integer.valueOf(0));
cb2.setSelectedItem(Integer.valueOf(0));
cb3.setSelectedItem(Integer.valueOf(0));
cb4.setSelectedItem(Integer.valueOf(0));
cb5.setSelectedItem(Integer.valueOf(0));
cb6.setSelectedItem(Integer.valueOf(0));
cb7.setSelectedItem(Integer.valueOf(0));
cb8.setSelectedItem(Integer.valueOf(0));
cb9.setSelectedItem(Integer.valueOf(0));
cb10.setSelectedItem(Integer.valueOf(0));
cb11.setSelectedItem(Integer.valueOf(0));
cb12.setSelectedItem(Integer.valueOf(0));
cb13.setSelectedItem(Integer.valueOf(0));
cb14.setSelectedItem(Integer.valueOf(0));
cb15.setSelectedItem(Integer.valueOf(0));
cb16.setSelectedItem(Integer.valueOf(0));
cb17.setSelectedItem(Integer.valueOf(0));
cb18.setSelectedItem(Integer.valueOf(0));
cb19.setSelectedItem(Integer.valueOf(0));
cb20.setSelectedItem(Integer.valueOf(0));
cb21.setSelectedItem(Integer.valueOf(0));
cb22.setSelectedItem(Integer.valueOf(0));
cb23.setSelectedItem(Integer.valueOf(0));
cb24.setSelectedItem(Integer.valueOf(0));
txt2.setText(" ");
txt3.setText(" ");
txt4.setText(" ");
txt5.setText(" ");
}
});
jexit.addActionListener(new ActionListener(){
public void actionPerformed (ActionEvent e){
System.exit(0);
}
});
f1.show();
}
public static void main (String args []){
forfinals xx = new forfinals();
}
}
这些是问题，
1.当你在“0”之类的引号中给出零时，它被视为字符串，而Integer则是必需的。
2.无法访问jFrame f2，因为它是在另一个动作事件中定义的。
3.变量equiv的问题也是如此，这就是为什么在jOptionpane的情况下无法访问它的原因。