Given the enumeration LetterGrade, what is the output of the following statements?
LetterGrade jacksGrade = LetterGrade.A;
LetterGrade jillsGrade = LetterGrade.B;
LetterGrade johnsGrade = LetterGrade.C;
LetterGrade fredsGrade = LetterGrade.B;
LetterGrade charliesGrade = jillsGrade;
System.out.println(jacksGrade);
System.out.println(jillsGrade.toString());
System.out.println(johnsGrade.ordinal());
System.out.println(jillsGrade == fredsGrade);
System.out.println(jillsGrade == charliesGrade);
System.out.println(jillsGrade.equals(fredsGrade));
System.out.println(jillsGrade.equals(charliesGrade));