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Thread: Can someone help me with my code.

  1. #1
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    Default Can someone help me with my code.

    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());
    	}
     
     
    }

    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.


  2. #2
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    Default Re: Can someone help me with my code.

    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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  3. #3
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    Default Re: Can someone help me with my code.

    Quote Originally Posted by KevinWorkman View Post
    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.
    I changed my code. I restarted because I couldn't figure out what the errors were.

    here is my main program so far.

    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.

    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?
    Last edited by you_know_what_it_is; February 23rd, 2012 at 03:05 PM.

  4. #4
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: Can someone help me with my code.

    When you say that your test class can't run it, what exactly do you mean? Do you have compiler errors? Something else?
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  5. #5
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    Default Re: Can someone help me with my code.

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

  6. #6
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    Default Re: Can someone help me with my code.

    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.

  7. #7
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    Default Re: Can someone help me with my code.

    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.
    Useful links: How to Ask Questions the Smart Way | Use Code Tags | Java Tutorials
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