Can someone help me with my code.

Code :

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import java.util.ArrayList;
import javax.swing.*;
import java.text.*;
import java.awt.*;
 
public class Student
{
	private String id = new String ();
	private String name = new String ();
	private double gpa;
	private Student [] person;
	private Student [] answers;
	private Student [] questions;
 
	Student() //Constructor
	{
		id = "Unknown ID";
		name = "Unknown Name";
		gpa = 0;
	}
 
	Student (String idnum, String n, double g)
	{
		id = idnum;
		name = n;
		gpa = g;
	}
 
	Student (int howManyKids, int howManyAnswers, String idnum, String n, double g)
	{
		id = new String(idnum);
		name = new String(n);
		double gpa = g;
 
		int i = 0;
		int a =0;
 
		person = new Student[howManyKids];
		for (i=0; i < howManyKids; ++i)
		person [i] = new Student();
 
		answers = new Student[howManyAnswers];
		for (a=0; a < howManyAnswers; ++a)
		answers [a] = new Student();
 
		//populate (howManyKids);
		//populate (howManyAnswers);
	}
 
	public void setAllStudentFields (int howManyKids, int howManyAnswers, String idnum, String n, double g)
	{
		id = new String(idnum);
		name = new String(n);
		double gpa = g;
 
		int i = 0;
		int a =0;
 
		person = new Student[howManyKids];
		for (i=0; i < howManyKids; ++i)
		person [i] = new Student();
 
		answers = new Student[howManyAnswers];
		for (a=0; a < howManyAnswers; ++a)
		answers [a] = new Student();
 
		//populate (howManyKids);
		//populate (howManyAnswers);
	}// end of setter to setAllStudentFields
 
	public static void teacherTest(ArrayList questions)
	{
		boolean valid = false;
 
		ArrayList<Character> key = new ArrayList<Character>();
		if ((one != 'T') || (one != 'F'))
			questions.add(new Character(one));
		else
		{
			System.out.println("Not an accpetable answer! Only enter a T or F.");
			valid = false;
			while (valid == false)
			{
				System.out.println("(Only enter a T or F)");
				System.out.println("Question number " + i + " -->");
				one = Character.toUpperCase(GetInput.readLineNonwhiteChar());
				if ((one != 'T') || (one != 'F'))
				{
					questions.add(new Character(one));
					valid = true;
				}//end of if statement
			}
		}
		while (one != 'X')
		{
			key.add(new Character(one));
			System.out.println("Enter the answer to question -->");
			one = Character.toUpperCase(GetInput.readLineNonwhiteChar());
		}
	}
 
	public static void testForOneStudent(ArrayList answers)
	{
		char one = ' ';
		Character torf;
		int i = 0;
		int correct = 0;
		boolean valid = false;
 
		for (i = 1; i <= 5; ++i)
		{
			System.out.println("(Only enter a T or F)");
			System.out.println("Question number " + i + " -->");
			one = Character.toUpperCase(GetInput.readLineNonwhiteChar());
			if ((one != 'T') || (one != 'F'))
				answers.add(new Character(one));
			else
			{
				System.out.println("Not an accpetable answer! Only enter a T or F.");
				valid = false;
				while (valid == false)
				{
					System.out.println("(Only enter a T or F)");
					System.out.println("Question number " + i + " -->");
					one = Character.toUpperCase(GetInput.readLineNonwhiteChar());
					if ((one != 'T') || (one != 'F'))
					{
						answers.add(new Character(one));
						valid = true;
					}//end of if statement
				}//end of while loop
			}//end of else path
		}// end of for loop
 
 
	}//end of public
	public String getName()
	{
		return name;
	}
 
	public String getID()
	{
		return id;
	}
 
	public double getGPA()
	{
		return gpa;
	}
 
	public void setName(String n)
	{
		name = n;
	}
 
	public void setID(String idnum)
	{
		id = idnum;
	}
 
	public void setGPA(double g)
	{
		gpa = g;
	}
 
	public Student[] getPersons()
	{
		return person;
	}
 
	public Student[] getAnswers()
	{
		return answers;
	}
 
	public String toPrintPersonArray()
	{
		String pOutput = new String();
 
		for (int i = 0; i < person.length; i++)
		{
			pOutput += "The number of kids are " + (i + 1) + "\nand they are " + person[i].toString() + "\n";
		}
 
		return pOutput;
	}
 
	public String toPrintAnswerArray()
	{
		String aOutput = new String();
 
		for (int i = 0; i < answers.length; i++)
		{
			aOutput += "The number of answers received are " + (i + 1) + "\nand they are " + answers[i].toString() + "\n";
		}
 
		return aOutput;
	}
 
	public String toString()
	{
		return ("\nName --> " + getName() + " \t Id Number --> " + getID() +
				" \t GPA --> " + getGPA() + "\n" + toPrintPersonArray() +
				toPrintAnswerArray());
	}
 
 
}

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I'm creating a program that has a user input a teacher key and the student's answer to output both the key, the students answer, student name, id, and gpa. I'm in the process of writing a test class but need to figure out the errors to this one first. This needs to be array based as well.

We can't really help you with the errors until you tell us what those errors are. I suggest you throw together an SSCCE that demonstrates one problem at a time without any extra code, and we'll go from there.

Quote:

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Originally Posted by KevinWorkman

We can't really help you with the errors until you tell us what those errors are. I suggest you throw together an SSCCE that demonstrates one problem at a time without any extra code, and we'll go from there.

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I changed my code. I restarted because I couldn't figure out what the errors were.

here is my main program so far.

Code :

---

import java.util.ArrayList;
import javax.swing.*;
import java.text.*;
import java.awt.*;
 
public class NewStudent
{
	private String id = new String ();
	private String name = new String ();
	private double gpa;
	private NewStudent [] person;
	private NewStudent [] answers;
	private NewStudent [] questions;
 
	NewStudent() //Constructor
	{
		id = "Unknown ID";
		name = "Unknown Name";
		gpa = 0;
	}
 
	NewStudent (int howManyKids, int howManyAnswers, String idnum, String n, double g)
	{
		id = new String(idnum);
		name = new String(n);
		double gpa = g;
 
		int i = 0;
		int a =0;
 
		person = new NewStudent[howManyKids];
		for (i=0; i < howManyKids; ++i)
		person [i] = new NewStudent();
 
		answers = new NewStudent[howManyAnswers];
		for (a=0; a < howManyAnswers; ++a)
		answers [a] = new NewStudent();
 
		//populate (howManyKids);
		//populate (howManyAnswers);
	}
 
	public void setAllStudentFields (int howManyKids, int howManyAnswers, String idnum, String n, double g)
	{
		id = new String(idnum);
		name = new String(n);
		double gpa = g;
 
		int i = 0;
		int a =0;
 
		person = new NewStudent[howManyKids];
		for (i=0; i < howManyKids; ++i)
		person [i] = new NewStudent();
 
		answers = new NewStudent[howManyAnswers];
		for (a=0; a < howManyAnswers; ++a)
		answers [a] = new NewStudent();
 
		//populate (howManyKids);
		//populate (howManyAnswers);
	}// end of setter to setAllStudentFields
 
	public static void teacherTest(ArrayList questions)
	{
		boolean valid = false;
 
		ArrayList<Character> key = new ArrayList<Character>();
		System.out.println("(Only enter a T or F for the Teacher's Key)");
		System.out.println("Enter the answer to question -->");
		char one = ' ';
		one = Character.toUpperCase(GetInput.readLineNonwhiteChar());
		if ((one != 'T') || (one != 'F'))
		questions.add(new Character(one));
		else
		{
			System.out.println("Not an accpetable answer! Only enter a T or F.");
			valid = false;
			while (valid == false)
			{
				System.out.println("(Only enter a T or F)");
				System.out.println("Enter the answer to question -->");
				one = Character.toUpperCase(GetInput.readLineNonwhiteChar());
				if ((one != 'T') || (one != 'F'))
				{
					questions.add(new Character(one));
					valid = true;
				}//end of if statement
			}
		}
		while (one != 'X')
		{
			key.add(new Character(one));
			System.out.println("Enter the answer to question -->");
			one = Character.toUpperCase(GetInput.readLineNonwhiteChar());
		}
	}
 
	public static void testForOneStudent(ArrayList answers)
	{
		char one = ' ';
		Character torf;
		int i = 0;
		int correct = 0;
		boolean valid = false;
 
		for (i = 1; i <= 5; ++i)
		{
			System.out.println("(Only enter a T or F)");
			System.out.println("Question number " + i + " -->");
			one = Character.toUpperCase(GetInput.readLineNonwhiteChar());
			if ((one != 'T') || (one != 'F'))
				answers.add(new Character(one));
			else
			{
				System.out.println("Not an accpetable answer! Only enter a T or F.");
				valid = false;
				while (valid == false)
				{
					System.out.println("(Only enter a T or F)");
					System.out.println("Question number " + i + " -->");
					one = Character.toUpperCase(GetInput.readLineNonwhiteChar());
					if ((one != 'T') || (one != 'F'))
					{
						answers.add(new Character(one));
						valid = true;
					}//end of if statement
				}//end of while loop
			}//end of else path
		}// end of for loop
 
 
	}//end of public
 
 
	public String getName()
	{
		return name;
	}
 
	public String getID()
	{
		return id;
	}
 
	public double getGPA()
	{
		return gpa;
	}
 
	public void setName(String n)
	{
		name = n;
	}
 
	public void setID(String idnum)
	{
		id = idnum;
	}
 
	public void setGPA(double g)
	{
		gpa = g;
	}
 
	public String toPrintPersonArray()
	{
		String pOutput = new String();
 
		for (int i = 0; i < person.length; i++)
		{
			pOutput += "The number of kids are " + (i + 1) + "\nand they are " + person[i].toString() + "\n";
		}
 
		return pOutput;
	}
 
	public String toPrintAnswerArray()
	{
		String aOutput = new String();
 
		for (int i = 0; i < answers.length; i++)
		{
			aOutput += "The number of answers received are " + (i + 1) + "\nand they are " + answers[i].toString() + "\n";
		}
 
		return aOutput;
	}
 
	public String toString()
	{
		return ("\nName --> " + getName() + " \t Id Number --> " + getID() +
				" \t GPA --> " + getGPA() + "\n" + toPrintPersonArray() +
				toPrintAnswerArray());
	}
}

---

That compiles ok but my test class can't run it.

Code :

---

import java.util.ArrayList;
import javax.swing.*;
import java.text.*;
import java.awt.*;
 
public class TestStudent
{
	public static void main(String args[])
    {
		String name;
		String id;
		double gpa;
 
		NewStudent john = new NewStudent();
		john.teacherTest();
 
 
 
 
 
 
 
 
 
 
	}
}

---

Can anyone help me get this running?

When you say that your test class can't run it, what exactly do you mean? Do you have compiler errors? Something else?

It says there is a problem with this line of code. john.teacherTest();

Left click the black screen that displays the error message.
Click on the select all option.
On your keyboard hit Ctrl + c.
Come back here and open a new reply and hit Ctrl + v.

You are trying to use a non-static method called teacherTest that does not take any parameters. Where do you have that method defined? Hint: you don't.