```java
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
class Student {
private int studentId;
private String name;
private List<Integer> marks;
public Student(int studentId, String name) {
this.studentId = studentId;
this.name = name;
this.marks = new ArrayList<>();
}
public int getStudentId() {
return studentId;
}
public String getName() {
return name;
}
public List<Integer> getMarks() {
return marks;
}
public void addMark(int mark) {
marks.add(mark);
}
}
public class ExaminationManager {
private List<Student> students;
public ExaminationManager() {
this.students = new ArrayList<>();
}
public void addStudent(int studentId, String name) {
Student student = new Student(studentId, name);
students.add(student);
System.out.println("Student added: " + studentId + " - " + name);
}
public void enterMarks(int studentId, int[] marks) {
Student student = findStudent(studentId);
if (student != null) {
for (int mark : marks) {
student.addMark(mark);
}
System.out.println("Marks entered for student: " + studentId);
} else {
System.out.println("Student not found.");
}
}
public void calculateGrades() {
for (Student student : students) {
List<Integer> marks = student.getMarks();
int totalMarks = 0;
for (int mark : marks) {
totalMarks += mark;
}
int averageMarks = totalMarks / marks.size();
String grade = calculateGrade(averageMarks);
System.out.println("Student: " + student.getName());
System.out.println("Average Marks: " + averageMarks);
System.out.println("Grade: " + grade);
}
}
public void generateReport(int studentId) {
Student student = findStudent(studentId);
if (student != null) {
System.out.println("Student Report");
System.out.println("Student ID: " + student.getStudentId());
System.out.println("Name: " + student.getName());
System.out.println("Marks: " + student.getMarks());
int totalMarks = 0;
for (int mark : student.getMarks()) {
totalMarks += mark;
}
int averageMarks = totalMarks / student.getMarks().size();
String grade = calculateGrade(averageMarks);
System.out.println("Average Marks: " + averageMarks);
System.out.println("Grade: " + grade);
} else {
System.out.println("Student not found.");
}
}
private Student findStudent(int studentId) {
for (Student student : students) {
if (student.getStudentId() == studentId) {
return student;
}
}
return null;
}
private String calculateGrade(int averageMarks) {
if (averageMarks >= 90) {
return "A+";
} else if (averageMarks >= 80) {
return "A";
} else if (averageMarks >= 70) {
return "B";
} else if (averageMarks >= 60) {
return "C";
} else if (averageMarks >= 50) {
return "D";
} else {
return "F";
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