我正在尝试将此文件读入Java。我需要计算GPA,调整和不调整。这是文件:
111,English 1 Honors,84,5-
180,Freshman Art,91,1.5-
210,Latin Honors 1,96,5-
313,Geometry Honors,86,5-
431,Religion 1-Catholic Christianity,89,5-
511,Biology Honors,88,5-
515,Biology Honors Lab,A,0.5-
611,World History Honors,90,5-
711,Freshman Computers Applications,98,1.5-
810,Phys Ed- Freshman,A,1.5-
120,English 2 CP,84,5-
181,Sophomore Art,95,1.5-
212,Latin 2 Honors,83,5-
322,Algebra II Honors,81,5-
420,Religion II- Christian Scriptures,90,5-
521,Chemistry Honors,78,5-
526,Chemistry Honors Lab,A,0.5-
621,American History Honors,87,5-
721,Sophomore Computers,89,1.5-
820,Phys Ed- Sophomore,A,1.5-
823,Sophomore Health,100,1.5-
130,English 3 CP,90,5-
214,Latin 3 Honors,81,5-
331,Pre-Calculus Honors,89,5-
430,Morality and Justice,87,5-
546,Physics CP,89,5-
550,Physics Lab,A,1-
631,American History Honors,91,5-
730,Computer Applications 3,89,2-
846,Phys Ed-AP Science Only,A,2-
这是我读取文件的代码。
public class readfromfile
{
public static void main(String[] args)
{
readfromfile rf = new readfromfile();
ArrayList<Student> Class = new ArrayList();
ArrayList<Integer> StudentAnswers = new ArrayList();
try
{
File ReportCard = new File("/home/*********/Desktop/Report_Card.txt");
Scanner NewScanner = new Scanner(ReportCard);
while(NewScanner.hasNextLine())
{
String line = NewScanner.nextLine();
int comma = line.indexOf(",");
int hyphen = line.indexOf("-");
String CourseNumber = line.substring(0,comma);
String CourseName = line.substring(comma,comma+1);
String FinalGrade = line.substring(comma+1, comma+2);
String Credit = line.substring(comma+2, hyphen);
ArrayList<Integer> CourseNumberArray = new ArrayList();
ArrayList<String> CourseNameArray = new ArrayList();
ArrayList<Integer> FinalGradeArray= new ArrayList();
ArrayList<Integer> CreditArray = new ArrayList();
Scanner searchline = new Scanner(CourseNumber);
Scanner searchline2 = new Scanner(CourseName);
Scanner searchline3 = new Scanner(FinalGrade);
Scanner searchline4 = new Scanner(Credit);
searchline.useDelimiter(",");
searchline2.useDelimiter(",");
searchline3.useDelimiter(",");
searchline4.useDelimiter(",");
for(int i = 0; i < 3; i++)
{
int temporary = searchline.nextInt();
CourseNumberArray.add(temporary);
}
for(int i = 0; i < 4; i ++)
{
String temporary = searchline2.next();
CourseNameArray.add(temporary);
}
for(int i = 0; i < 4; i++)
{
int temporary = searchline3.nextInt();
FinalGradeArray.add(temporary);
}
for(int i = 0; i < 4; i++)
{
int temporary = searchline4.nextInt();
CreditArray.add(temporary);
}
}
NewScanner.close();
}
catch(FileNotFoundException p)
{
System.out.println("File not found");
}
}
}
运行时从控制台:
Exception in thread "main" java.lang.Error: Unresolved compilation problems:
Student cannot be resolved to a type
Course cannot be resolved to a type
Course cannot be resolved to a type
CourseNumberArrayList cannot be resolved to a variable
CourseNameArrayList cannot be resolved to a variable
CreditArrayList cannot be resolved to a variable
Grades cannot be resolved to a type
Grades cannot be resolved to a type
CourseNumberArrayList cannot be resolved to a variable
FinalGradeArrayList cannot be resolved to a variable
CreditArrayList cannot be resolved to a variable
at readfromfile.main(readfromfile.java:14)
答案 0 :(得分:0)
虽然您的帖子是missing a question,但似乎您的问题是:
如何修复
java.lang.Error
未解决的编译问题
第一个问题是<identifier> cannot be resolved to a type
。
这意味着您需要declare a class名称为<identifier>
,或者更改它以匹配您已宣布的班级名称。
第二个问题是<identifier> cannot be resolved to a variable
。
这意味着您需要declare a variable名称为<identifier>
,或者更改它以匹配您已声明的变量名称。