This closing topic consolidates Chapter 1: variables, data types, operators, strings, control flow, wrapper classes, and arrays working together in complete, runnable programs — the same way they combine in real code.
This program combines an array, a for-each loop, if/else-if branching, and mixed-type arithmetic (`(double) total / scores.length` avoids integer-division truncation) into one working example.
public class ClassGrader {
public static void main(String[] args) {
int[] scores = {95, 72, 88, 61, 79};
int total = 0;
for (int score : scores) {
total += score;
char grade;
if (score >= 90) {
grade = 'A';
} else if (score >= 80) {
grade = 'B';
} else if (score >= 70) {
grade = 'C';
} else {
grade = 'F';
}
System.out.println("Score " + score + " -> " + grade);
}
double average = (double) total / scores.length;
System.out.println("Class average: " + average);
}
}public class ClassGrader {
public static void main(String[] args) {
int[] scores = {95, 72, 88, 61, 79};
int total = 0;
for (int score : scores) {
total += score;
char grade;
if (score >= 90) {
grade = 'A';
} else if (score >= 80) {
grade = 'B';
} else if (score >= 70) {
grade = 'C';
} else {
grade = 'F';
}
System.out.println("Score " + score + " -> " + grade);
}
double average = (double) total / scores.length;
System.out.println("Class average: " + average);
}
}Score 95 -> A
Score 72 -> C
Score 88 -> B
Score 61 -> F
Score 79 -> C
Class average: 79.0