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這裏是我的決賽的代碼。一個評分系統的成績都在24 JComboBox中。一些數字直到10,20和30.每個季度它們都被計算並顯示在JTextfield中。當四個季度完成時，Jbutton「COMPUTE ALL」將計算整個數據，並在另一個框架中顯示學生的成績和天氣，他或她已經通過或失敗。此代碼適用於一些問題：（1）我的Jbutton「CLEAR ALL」不起作用。它應該顯示單擊時的默認數字「0」，並且Jtextfields必須爲空 - （此時已經工作「TEXTFIELD空」）（2）當點擊計算全部Jbutton時，我想隱藏第二幀（f2.hide （）; f3.show（）;）但它一直說（無法找到符號 符號：變量f2cannot找到符號）（3）最後在我的第三幀，其中學生的最終成績和最終評級顯示我真的不能擁有它在消息對話框中顯示，說明天氣，他或她通過或失敗THANKS比較遺憾的是糟糕的編碼使用JComboBox進行評分的分級系統; Jlabel，JTextFirld，JFrame; JButton的事件;所有在JFrame
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（空「」 +當量）;如果 （相等> = 1.00 & & equiv < = 3.0）JOptionPane.showMessageDia日誌（null，「你通過！」）;如果（equiv> = 3.10 & & equiv < = 75）JOptionPane.showMessageDialog（null，「YOU FAILED！」）; } }）;
jclear.addActionListener(new ActionListener(){
public void actionPerformed (ActionEvent e){
//此部分不起作用。即使單擊「全部清除」按鈕，JComboBox仍包含已初始化的數字 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();
}
}
謝謝。我從這裏學到的東西比在學校裏多了。再次感謝。非常感激 –