How to make a java program that gets average test scores?

I need help making a java program that will allow me to input 10 test grades into an array using a dialog box in one method. Then in a different method it needs to display the grades and calculate the average, highest, and lowest grade. I have no idea where to start and need a lot of help please.

 

Try getting this done in a console based Java Program and once you have the logic done, you can always get it in the dialog box.

 

Hi, do you still need help with your problem?

 

Any reason for asking that

 

Try reading Java How to Program by Dietel. There's a similar code there for computing average tests...

 

Hey, try this one using loop :

Code:

double total;
for(int student = 1; student <= 4; student++) {
    System.out.printf("Student %d\n", student);
    double sum = 0, count = 0;

    while(true) {
        System.out.printf("Enter your score: ");
        double input = scanner.nextDouble();
        if(input == -1) break;
        sum += input;
        count++;
    }
    total += sum;

    System.out.printf("Average: %.2f\n", sum / count);
}

System.out.printf("Total: %.2f\n", total);

 

check this out:

Code:

/*
 * java program that will allow me to input 10 test grades into an array using a dialog box in one method.
 * Then in a different method it needs to display the grades and calculate the average, highest, and lowest grade
 */
import javax.swing.JOptionPane;

public class input10testgrades
{
	private final int studentGrades[] = new int[10];
	private double average;
	
	public void inputStudentGrades()
	{
		for(int i = 0; i < studentGrades.length; i++)
		{
			studentGrades[i] = Integer.parseInt(JOptionPane.showInputDialog(null));
		}
	}
	public void displayGrade()
	{
		System.out.println("This are all the test grades\n=================================");
		for(int i = 0; i < studentGrades.length; i++)
		{
			System.out.println(studentGrades[i]);
		}
		
		System.out.println("\n\nThe total average of grades\n=================================");
		
		double gradesSum = 0;
		int highestNum = 0;
		int lowestNum = studentGrades[0]; //here we are getting the first grade test
		
		for(int grade : studentGrades)
		{
			gradesSum+=(double)grade; //here we are getting the total sum of all the test grade
			
			//here am checking for the highest number
			if(grade > highestNum)
				highestNum = grade;
			//here am checking for the lowest number	
			if(grade < lowestNum)
				lowestNum = grade;
		}
		
		average = gradesSum/10; //here we are calculate the average of the total grade test
		System.out.println(average);
		System.out.println("\nThe Highest Grade Number is :"+highestNum);
		System.out.println("\nThe Lowest Grade Number is :"+lowestNum);
		
		
	}
	public static void main(String []grade)
	{
		input10testgrades testgrades = new input10testgrades();
		testgrades.inputStudentGrades();
		testgrades.displayGrade();
	}
}

 

If this is your first introduction to Java I would suggest ignoring the fact you want a dialog box and make a simple console application to begin with. Once this is working correctly you can then put this into a GUI.

 

Code:

import java.util.Scanner;

public class AverageTestScore
{
   public static void main(String[] args)
   {
       //create the variables
       int TestScore1;
       int TestScore2;
       int TestScore3;
       int TestScore4;
       int TestScore5;
       float AverageScore;
    
       //create keyboard for input
       Scanner Keyboard = new Scanner(System.in);
    
       //Ask the user for the 5 test scores
       System.out.println("Please enter test score 1");
       TestScore1 = Keyboard.nextInt();
    
       System.out.println("Please enter test score 2");
       TestScore2 = Keyboard.nextInt();
    
       System.out.println("Please enter test score 3");
       TestScore3 = Keyboard.nextInt();
    
       System.out.println("Please enter test score 4");
       TestScore4 = Keyboard.nextInt();
    
       System.out.println("Please enter test score 5");
       TestScore5 = Keyboard.nextInt();
    
       //Calculate the average score for the tests
       AverageScore = ((TestScore1 + TestScore2 + TestScore3 + TestScore4 + TestScore5)/5);
    
       //Display Average test Score
       System.out.println("The average score of the 5 tests is " + AverageScore);
   }
}