I am not sure how/where to add the public static void main(String[] args). I am getting an error to define the main method as: public static void main(String[] args). When I tried to add it in it gave me errors with the rest of the code. Any feedback is helpful, I have had this issue before and am not sure how to add the main method.
import java.util.ArrayList;
public class Main {
private ArrayList <String> studentNames = new ArrayList <String> ();
private char[] studentLetterGrades = { 'A', 'B', 'C','D','F'};
private double[][] studentsTestScores; //all students test scores
public String getStudentName(int studentIndex){
return studentNames.get(studentIndex);
}
public double calculateAverageTestScore(double [] studentsTestScores){
double studentTestScoreTotal = 0;
double studentTestScoreAverage;
for( int currentStudentTestScore = 0; currentStudentTestScore < studentsTestScores.length;currentStudentTestScore++){
studentTestScoreTotal = studentTestScoreTotal + studentsTestScores[currentStudentTestScore];
}
studentTestScoreAverage = studentTestScoreTotal / studentsTestScores.length;
return studentTestScoreAverage;
}
public char getStudentLetterGrade(double studentTestScoreAverage){
char studentLetterGrade = 'Z';
if(studentTestScoreAverage < 60){
studentLetterGrade = 'F';
} else if(studentTestScoreAverage < 70){
studentLetterGrade = 'D';
} else if(studentTestScoreAverage < 80){
studentLetterGrade = 'C';
} else if(studentTestScoreAverage < 90){
studentLetterGrade = 'B';
} else if(studentTestScoreAverage <= 100){
studentLetterGrade = 'A';
}
return studentLetterGrade;
}
public void setStudentName( String studentName){
studentNames.add(studentName);
}
public void setStudentScore( int studentIndex, int scoreIndex, double studentScore){
studentsTestScores[ studentIndex][scoreIndex] = studentScore;
}
public double [][] getStudentTestScoresArray(){
return studentsTestScores;
}
public Main( int numberOfStudents, int numberOfTestScoresPerStudent){
studentsTestScores = new double[numberOfStudents][numberOfTestScoresPerStudent];
}
}
the public static void main(String[] args) function should be encapsulated within a class for instance:
class Main{
public static void main(String[] args) {
}
}
in your case:
import java.util.ArrayList;
public class Main {
private ArrayList <String> studentNames = new ArrayList <String> ();
private char[] studentLetterGrades = { 'A', 'B', 'C','D','F'};
private double[][] studentsTestScores; //all students test scores
public String getStudentName(int studentIndex){
return studentNames.get(studentIndex);
}
public double calculateAverageTestScore(double [] studentsTestScores){
double studentTestScoreTotal = 0;
double studentTestScoreAverage;
for( int currentStudentTestScore = 0; currentStudentTestScore <
studentsTestScores.length;currentStudentTestScore++){
studentTestScoreTotal = studentTestScoreTotal + studentsTestScores[currentStudentTestScore];
}
studentTestScoreAverage = studentTestScoreTotal / studentsTestScores.length;
return studentTestScoreAverage;
}
public char getStudentLetterGrade(double studentTestScoreAverage){
char studentLetterGrade = 'Z';
if(studentTestScoreAverage < 60){
studentLetterGrade = 'F';
} else if(studentTestScoreAverage < 70){
studentLetterGrade = 'D';
} else if(studentTestScoreAverage < 80){
studentLetterGrade = 'C';
} else if(studentTestScoreAverage < 90){
studentLetterGrade = 'B';
} else if(studentTestScoreAverage <= 100){
studentLetterGrade = 'A';
}
return studentLetterGrade;
}
public void setStudentName( String studentName){
studentNames.add(studentName);
}
public void setStudentScore( int studentIndex, int scoreIndex, double studentScore){
studentsTestScores[ studentIndex][scoreIndex] = studentScore;
}
public double [][] getStudentTestScoresArray(){
return studentsTestScores;
}
public Main( int numberOfStudents, int numberOfTestScoresPerStudent){
studentsTestScores = new double[numberOfStudents][numberOfTestScoresPerStudent];
}
// add the main method here
}
// add the main method
public static void main(String[] args) {
}
but it's better to partition your classes for instance the main should be created alone under Main.java
PS: you can add at most one Main method in each class
Best Regards,
It is a method so it goes inside the class next to the other methods.
public class Main {
public static void main(String[] args) {
}
public void setStudentName( String studentName){
studentNames.add(studentName);
}
[... other methods ...]
}
The relative order of methods inside your class does not matter.
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