Question

Write a Java program that sorts an array of “Student” in an aescending order of their “last names”. The program should be able to apply (Insertion sort):

Student [] studs = new Student[8];

s[0] = new Student("Saoud", "Mohamed", 3.61);

s[1] = new Student("Abdelkader", "Farouk", 2.83);

s[2] = new Student("Beshr" , "Alsharqawy", 1.99);

s[3] = new Student("Nader", "Salah", 3.02);

s[4] = new Student("Basem", "Hawary", 2.65);

s[5] = new Student("Abdullah", "Babaker", 2.88);

s[6] = new Student("Abdelaal", "Khairy", 3.13);

s[7] = new Student("Mohamedain", "Marsily", 4.00);

Answer 1

public class StudentSorter {
        
        static class Student {
                
                private String first, last;
                private double gpa;

                public Student(String first, String last, double gpa) {
                        this.first = first;
                        this.last = last;
                        this.gpa = gpa;
                }

                public String getFirst() {
                        return first;
                }

                public String getLast() {
                        return last;
                }

                public double getGpa() {
                        return gpa;
                }

                @Override
                public String toString() {
                        return first + " " + last + ": " + gpa;
                }
        }

        public static void sortStudents(Student arr[]) {

            for (int i = 1; i < arr.length; i++) { 
                Student key = arr[i]; 
                int j = i - 1;
                while (j >= 0 && arr[j].getLast().compareTo(key.getLast()) > 0) {
                        arr[j + 1] = arr[j];
                    j = j - 1;
                }
                arr[j + 1] = key; 
            }
        }
        
        public static void main(String[] args) {

                Student[] s = new Student[8];
                s[0] = new Student("Saoud", "Mohamed", 3.61);
                s[1] = new Student("Abdelkader", "Farouk", 2.83);
                s[2] = new Student("Beshr", "Alsharqawy", 1.99);
                s[3] = new Student("Nader", "Salah", 3.02);
                s[4] = new Student("Basem", "Hawary", 2.65);
                s[5] = new Student("Abdullah", "Babaker", 2.88);
                s[6] = new Student("Abdelaal", "Khairy", 3.13);
                s[7] = new Student("Mohamedain", "Marsily", 4.00);
                
                
                sortStudents(s);
                
                
                for(Student x: s) {
                        System.out.println(x);
                }
        }

}

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