帮助,我无法让我的程序成功运行。它给我一个错误,有两个输入用于中期标记和最终标记。弹出适当的结尾时我无法完全运行。我试图编写一个程序,接受来自用户的标记,并为未知数量的学生显示适当的字母等级。我的代码如下。Java代码编辑
import javax.swing.*;
public class StudentGrades_Hann{
public static void main (String[] args) {
String input ;
input= JOptionPane.showInputDialog(" Enter Name, \n ID Number,\n Homework Mark, \n Assignment Mark, \n Midterm Mark, \n and Final Mark \n All Entrys Must Be Separated By Commas");
int com;
com= input.indexOf(",");
String name ;
name = input.substring(0,com);
int com2;
com2= input.indexOf(",", com+1);
String idnumber ;
idnumber = input.substring(com+1, com2);
int com3;
com3= input.indexOf(",", com2+1);
String homeworkmark ;
homeworkmark = input.substring(com2+1, com3);
int com4;
com4= input.indexOf(",", com3+1);
String assignmentmark ;
assignmentmark = input.substring(com3+1, com4);
int com5;
com5= input.indexOf(",", com4+1);
String midtermmark ;
midtermmark = input.substring(com4+1, com5);
int com6;
com6= input.indexOf(",", com5+1);
String finalmark ;
finalmark = input.substring(com4+1);
double as ;
as = Double.parseDouble (assignmentmark.trim());
double hw ;
hw = Double.parseDouble (homeworkmark.trim());
double mm ;
mm = Double.parseDouble (midtermmark.trim());
double fm ;
fm = Double.parseDouble (finalmark.trim());
String grade ;
double totalmark ;
totalmark= 0.1*hw+0.1*as+0.3*mm+0.5*fm ;
double mnf ;
mnf= 0.5*fm+0.3*mm ;
if(totalmark < 50 || mnf < 50) {
JOptionPane.showMessageDialog(null,name + idnumber + "Fail") ;
}
else if (totalmark < 85) {
JOptionPane.showMessageDialog(null, name + idnumber + "A") ;
}
else if (totalmark < 75) {
JOptionPane.showMessageDialog(null,name + idnumber + "B") ;
}
else if (totalmark <65) {
JOptionPane.showMessageDialog(null, name + idnumber + "C");
}
else if (totalmark <=50) {
JOptionPane.showMessageDialog(null,name + idnumber + "D") ;
}
else {
JOptionPane.showMessageDialog(null, "Invalid Entry") ;
}
}
}
如果你得到错误?我指的是哪一行。 – 2013-03-13 16:09:30
我不确定,但'input.indexOf(“,”);'这些行可能是问题的根源。尝试使用'String [] in = input.split(“,”);'它将通过','分割您的输入,并且将创建新的字符串数组。 – Smit 2013-03-13 16:16:50
它不具体。我假设它将字符串转换为double。我得到一个异常错误“线程中的异常”主要“java.lang.NumberFormatException:对于输入字符串:”80,90“ \t at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1222) \t at java。在StudentGrades_Hann.main(StudentGrades_Hann.java:55) – user2166241 2013-03-13 16:17:37