Now you have got the basic idea of declaring and invoking method(s). Then try to

Question

Now you have got the basic idea of declaring and invoking method(s). Then try to re-visit your grade calculator and put each functional module to a method. First thing you can consider to use is to put those TEN error-checking do-while loops to ONE method, and each time you just need to invoke that method. It should be a lot easier to organize your program in this way.

You can re-visit the grade calculator below:

import javax.swing.*;
import java.util.*;
public class CalculatingGrades
{
public static void main(String [] args)
{
   // initialize grades, place holders for grade inputs, arraylist used for multiple grades
int [] labGrades = new int[10];
int [] hwGrades = new int[3];
int [] quizGrades = new int[5];
int midtermGrade1;
int midtermGrade2;
double finalGrade;
  
// takes input for name
String name = JOptionPane.showInputDialog("Please Enter Student Name: 0");
  
// dialogs for each input, loops for multiple grade per section
int j = 1;
for (int i = 0; i < 10; i++){
String question = JOptionPane.showInputDialog("Please input grades for Lab " + j + ":");
int answer = Integer.parseInt(question);
labGrades[i] = answer;
j++;
}
int k = 1;
for (int i = 0; i < 3; i++){
String question = JOptionPane.showInputDialog("Please input grades for Homework " + k + ":");
int answer = Integer.parseInt(question);
hwGrades[i] = answer;
k++;
}
int l = 1;
for (int i = 0; i < 5; i++){
String question = JOptionPane.showInputDialog("Please input grades for Quiz " + l + ":");
int answer = Integer.parseInt(question);
quizGrades[i] = answer;
l++;
}
  
// take inputs for single grades
String question1 = JOptionPane.showInputDialog("Please input grades for Midterm 1");
int answer1 = Integer.parseInt(question1);
midtermGrade1 = answer1;
  
String question2 = JOptionPane.showInputDialog("Please input grades for Midterm 2");
int answer2 = Integer.parseInt(question2);
midtermGrade2 = answer2;
  

String question = JOptionPane.showInputDialog("Please input grades for Final Exam:");
int answer = Integer.parseInt(question);
finalGrade = answer;
  
// calculates the average for the array of grades
double avgLab = getAvg(labGrades);
double avgHw = getAvg(hwGrades);
double avgQuiz = getAvg(quizGrades);
  
// calculates the grade percentage
double lab = avgLab * .2;
double hw = avgHw * .15;
double quiz = avgQuiz * .15;
double midterm = midtermGrade1 * .15;
double midterm2 = midtermGrade2 * .15;
finalGrade = finalGrade * .20;
  
// calculates final, total grade
double finalClassGrade = lab + hw + quiz + midterm + midterm2 + finalGrade;
String letterGrade = "";
  
// displays which letter grade based on average
if (finalClassGrade >= 90){
   JOptionPane.showMessageDialog(null, "Congrats, you got an A. Your average was " + finalClassGrade);
   letterGrade = "A";
}
if (finalClassGrade >= 80 && finalClassGrade < 90){
   JOptionPane.showMessageDialog(null, "Congrats, you got an B. Your average was " + finalClassGrade);  
   letterGrade = "B";
}
if (finalClassGrade >= 70 && finalClassGrade < 80){
   JOptionPane.showMessageDialog(null, "Congrats, you got an C. Your average was " + finalClassGrade);
   letterGrade = "C";
}
if (finalClassGrade >= 60 && finalClassGrade < 70){
   JOptionPane.showMessageDialog(null, "Congrats, you got an D.Your average was " + finalClassGrade);
   letterGrade = "D";
}
if (finalClassGrade < 60){
   JOptionPane.showMessageDialog(null, "Congrats, you got an F. Your average was " + finalClassGrade);
   letterGrade = "F";
}
  
// Extra Credit: prints out the report in system.out.println
System.out.println("Name: " + name);
for (int i = 0; i < 10; i++){
   System.out.println("Lab " + (i+1) + ": " + labGrades[i]);
}
for(int i = 0; i < 3; i++){
   System.out.println("Homework " + (i+1) + ": " + hwGrades[i]);
}
for(int i = 0; i < 5; i++){
   System.out.println("Quiz " + (i+1) + ": " + quizGrades[i]);
}
System.out.println("Midtem 1: " + midtermGrade1 + " Midterm 2: "
                   + midtermGrade2 + " Final: " + finalGrade
                   + " Total Grade: " + finalClassGrade
                   + " Letter Grade: " + letterGrade);
  
  
}
  
// method to loop through the arraylist of grades and get an average for catagory grade
public static int getAvg(int [] n){
int avg = 0;
for (int i = 0; i < n.length; i++){
avg = avg + n[i];
}
avg = avg/n.length;
return avg;
}

}

Explanation / Answer

Used following methods

getLabGrades(labGrades);
getQuizGrades(quizGrades);
getHwGrades(hwGrades);     
midtermGrade1 = getMidTermGrade1();   
midtermGrade2 = getMidTermGrade2();   
finalGrade = getFinalGrade();

Here is complete code

import javax.swing.*;
import java.util.*;
public class CalculatingGrades
{
public static void getLabGrades(int grades[])
{
for (int i = 0; i < 10; i++){
String question = JOptionPane.showInputDialog("Please input grades for Lab " + (i+1) + ":");
int answer = Integer.parseInt(question);
grades[i] = answer;

}

}
public static void getQuizGrades(int grades[])
{
  
for (int i = 0; i < 5; i++){
String question = JOptionPane.showInputDialog("Please input grades for Quiz " + (i+1) + ":");
int answer = Integer.parseInt(question);
grades[i] = answer;
  
}
}
public static void getHwGrades(int grades[])
{
for (int i = 0; i < 3; i++){
String question = JOptionPane.showInputDialog("Please input grades for Homework " + (i+1) + ":");
int answer = Integer.parseInt(question);
grades[i] = answer;
//k++;
}
  
}
public static int getMidTermGrade1()
{
String question1 = JOptionPane.showInputDialog("Please input grades for Midterm 1");
return Integer.parseInt(question1);

}
public static int getMidTermGrade2()
{
String question2 = JOptionPane.showInputDialog("Please input grades for Midterm 2");
return Integer.parseInt(question2);

}
public static int getFinalGrade()
{
String question = JOptionPane.showInputDialog("Please input grades for Final Exam:");
return Integer.parseInt(question);

}

public static void main(String [] args)
{
// initialize grades, place holders for grade inputs, arraylist used for multiple grades
int [] labGrades = new int[10];
int [] hwGrades = new int[3];
int [] quizGrades = new int[5];
int midtermGrade1;
int midtermGrade2;
double finalGrade;
  
// takes input for name
String name = JOptionPane.showInputDialog("Please Enter Student Name: 0");
  
// dialogs for each input, loops for multiple grade per section
  
  
getLabGrades(labGrades);
getQuizGrades(quizGrades);
getHwGrades(hwGrades);
  
  
// take inputs for single grades
midtermGrade1 = getMidTermGrade1();
  
midtermGrade2 = getMidTermGrade2();
  
finalGrade = getFinalGrade();
  
// calculates the average for the array of grades
double avgLab = getAvg(labGrades);
double avgHw = getAvg(hwGrades);
double avgQuiz = getAvg(quizGrades);
  
// calculates the grade percentage
double lab = avgLab * .2;
double hw = avgHw * .15;
double quiz = avgQuiz * .15;
double midterm = midtermGrade1 * .15;
double midterm2 = midtermGrade2 * .15;
finalGrade = finalGrade * .20;
  
// calculates final, total grade
double finalClassGrade = lab + hw + quiz + midterm + midterm2 + finalGrade;
String letterGrade = "";
  
// displays which letter grade based on average
if (finalClassGrade >= 90){
JOptionPane.showMessageDialog(null, "Congrats, you got an A. Your average was " + finalClassGrade);
letterGrade = "A";
}
if (finalClassGrade >= 80 && finalClassGrade < 90){
JOptionPane.showMessageDialog(null, "Congrats, you got an B. Your average was " + finalClassGrade);
letterGrade = "B";
}
if (finalClassGrade >= 70 && finalClassGrade < 80){
JOptionPane.showMessageDialog(null, "Congrats, you got an C. Your average was " + finalClassGrade);
letterGrade = "C";
}
if (finalClassGrade >= 60 && finalClassGrade < 70){
JOptionPane.showMessageDialog(null, "Congrats, you got an D.Your average was " + finalClassGrade);
letterGrade = "D";
}
if (finalClassGrade < 60){
JOptionPane.showMessageDialog(null, "Congrats, you got an F. Your average was " + finalClassGrade);
letterGrade = "F";
}
  
// Extra Credit: prints out the report in system.out.println
System.out.println("Name: " + name);
for (int i = 0; i < 10; i++){
System.out.println("Lab " + (i+1) + ": " + labGrades[i]);
}
for(int i = 0; i < 3; i++){
System.out.println("Homework " + (i+1) + ": " + hwGrades[i]);
}
for(int i = 0; i < 5; i++){
System.out.println("Quiz " + (i+1) + ": " + quizGrades[i]);
}
System.out.println("Midtem 1: " + midtermGrade1 + " Midterm 2: "
+ midtermGrade2 + " Final: " + finalGrade
+ " Total Grade: " + finalClassGrade
+ " Letter Grade: " + letterGrade);
  
  
}
  
// method to loop through the arraylist of grades and get an average for catagory grade
public static int getAvg(int [] n){
int avg = 0;
for (int i = 0; i < n.length; i++){
avg = avg + n[i];
}
avg = avg/n.length;
return avg;
}
}

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