Thread: Array with Switch Construct

I am currently working on a final project for my Intro to Java course, and I am having a problem getting started. The main point of the program is to create a char array with grade letters (A, B, C, D, and F). I'm trying to make it so that when I put in a number (eg. 96) it gives me a letter grade from my array. I have no problem doing it this way...

public class Grades {
 
private char [ ] letterGrade = {'A', 'B', 'C', 'D', 'F'}; // Char array
 
public void displayGrade(int percent) { // Overloaded Display method to be manipulated in test class
   if(percent <=100 && percent >=90) {
      System.out.println(letterGrade[0]);
      }
   }

.......

And so on...

The problem is, the assignment calls for use of a switch construct. How can I use the array within the switch construct while still being able to input a percent in my test class and have the letter grade output?

Are you sure you're reading the assignment correctly? If-else is definitely the way to go here. If you are indeed required to write using a switch statement, you have a lot of copy-pasting in your future

I got it figured out! Here's the finished product...

package seminarsixcode;
 
public class Grades { // Start of class
 
   private char [ ] letterGrade = {'A', 'B', 'C', 'D', 'F'}; // Character array holding the 5 letter grades
   private int numberGrade;
   private char grade;
 
   public void setGrade(int percent) {          // Start of setGrade method
       if(percent <=100 && percent >=90) { // Start of if statement for grade A
           numberGrade = percent;
           grade = (char)letterGrade[0];
       }                                                            // End of if statement for grade A
       if(percent <=89 && percent >=80) { // Start of if statement for grade B
           numberGrade = percent;
           grade = (char)letterGrade[1];
       }                                                            // End of if statement for grade B
       if(percent <=79 && percent >=70) { // Start of if statement for grade C
           numberGrade = percent;
           grade = (char)letterGrade[2];
       }                                                            // End of if statement for grade C
       if(percent <=69 && percent >=60) { // Start of if statement for grade D
           numberGrade = percent;
           grade = (char)letterGrade[3];
       }                                                          // End of if statement for grade D
       if(percent <=59 && percent >=0) { // Start of if statement for grade F
           numberGrade = percent;
           grade = (char)letterGrade[4];
       }                                                         // End of if statement for grade F
   }                                                             // End of setGrade method
 
   public char getLetterGrade() { // Start of getLetterGrade method
       return grade;
   }                                                 // End of getLetterGrade method
 
   public int getNumberGrade() { // Start of getNumberGrade method
       return numberGrade;
   }                                                  // End of getNumberGrade method
 
   public void raiseGrade() { // Start of raiseGrade method
       numberGrade = numberGrade + 10; // Adds 10 to the numberGrade variable
       setGrade(numberGrade); // Returns to setGrade method with new value for numberGrade
   }                                         // End of raiseGrade method
 
   public void lowerGrade() { // Start of lowerGrade method
       numberGrade = numberGrade - 15; // Subtracts 15 from the numberGrade variable
       setGrade(numberGrade); // Returns to setGrade method with new value for numberGrade
   }                                           // End of lowerGrade method
 
   public void displayAllGrades() { // Start of displayAllGrades method
       System.out.println("100 - 90 = " + letterGrade[0]);
       System.out.println("89 - 80 = " + letterGrade[1]);
       System.out.println("79 - 70 = " + letterGrade[2]);
       System.out.println("69 - 60 = " + letterGrade[3]);
       System.out.println("59 - 0 = " + letterGrade[4]);
   }                                                    // End of displayAllGrades method
 
   public void students (char student) { // Start of students method
       switch(student) { // Start of switch construct
           case 'D': // D for default.  Prints the Baker College Grading Rubric
               System.out.println("Baker College Grading Rubric:\n");
               displayAllGrades();
               break;
           case 'B': // B for Bill
               setGrade(89); // Bills starting points
               numberGrade = getNumberGrade();
               grade = getLetterGrade();
               System.out.println("\nBill started with " + numberGrade + " points and a grade of " + grade + " in his Java class.");
               raiseGrade(); // 10 point increase
               numberGrade = getNumberGrade();
               grade = getLetterGrade();
               System.out.println("Bill passed his quiz and his points rose to " + numberGrade + " points and a grade of " + grade + " in his Java class.");
               lowerGrade(); // 15 point decrease
               numberGrade = getNumberGrade();
               grade = getLetterGrade();
               System.out.println("Bill did not do so well on his coding project and his points dropped to " + numberGrade + " points and a final grade of " + grade + " in his Java class.");
               break;
           case 'S': // S for Susan
                setGrade(92); // Susans starting points
               numberGrade = getNumberGrade();
               grade = getLetterGrade();
               System.out.println("\nSusan started with " + numberGrade + " points and a grade of " + grade + " in her Java class.");
               lowerGrade(); // 15 point decrease
               numberGrade = getNumberGrade();
               grade = getLetterGrade();
               System.out.println("Susan failed her quiz and her points dropped to " + numberGrade + " points and a grade of " + grade + " in her Java class.");
               raiseGrade(); // 10 point increase
               numberGrade = getNumberGrade();
               grade = getLetterGrade();
               System.out.println("Susan did very well on her coding project and her points have risen to " + numberGrade + " points and a final grade of " + grade + " in her Java class.\n");
               break;
       } // End of switch construct
   } // End of students method
 
} // End of class

Good Job WhiteSoup12..


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