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2,6988491,137Released 3mo ago100% Freepackage eecs2030.lab3; import java.util.Objects; public final class Bird implements Comparable<Bird> { private final String species; private final double weightInGrams; public Bird(String species, double weightInGrams) { this.species = species; this.weightInGrams = weightInGrams; } public Bird() { this("Unknown", 300.0); } public String getSpecies() { return species; } public double getWeightInGrams() { return weightInGrams; } private double weightRoundedTo20Grams() { return Math.round(weightInGrams / 20.0) * 20.0; } @Override public boolean equals(Object obj) { if (this == obj) return true; if (!(obj instanceof Bird)) return false; Bird other = (Bird) obj; return Objects.equals(species, other.species) && Double.compare(weightRoundedTo20Grams(), other.weightRoundedTo20Grams()) == 0; } @Override public int hashCode() { long rBits = Double.doubleToLongBits(weightRoundedTo20Grams()); int weightHash = (int) (rBits ^ (rBits >>> 32)); return Objects.hash(species, weightHash); } @Override public String toString() { return String.format("Bird[species=%s, weightInGrams=%.3f]", species, weightInGrams); } @Override public int compareTo(Bird other) { double thisRounded = weightRoundedTo20Grams(); double otherRounded = other.weightRoundedTo20Grams(); int cmp = Double.compare(thisRounded, otherRounded); return cmp != 0 ? cmp : species.compareTo(other.species); } }
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Nabasa Isaac
🙏 1 karma
Oct 31, 2024
# Part (a): Add a Student
def add_student(student_list, student_id, name, age, course):
# Check for unique student ID
for student in student_list:
if student['student_id'] == student_id:
print(f"Error: Student ID {student_id} already exists!")
return
# Add the new student
student_list.append({
'student_id': student_id,
'name': name,
'age': age,
'course': course
})
print(f"Student {name} added successfully.")
# Part (b1): Find a Student by ID
def find_student_by_id(student_list, student_id):
for student in student_list:
if student['student_id'] == student_id:
return student
print("Student not found!")
return None
# Part (b2): Remove a Student by ID
def remove_student_by_id(student_list, student_id):
for student in student_list:
if student['student_id'] == student_id:
student_list.remove(student)
print(f"Student ID {student_id} removed successfully.")
return
print("Student not found!")
# Part (c): Class Definitions
class Person:
def __init__(self, name, age):
self.name = name
self.age = age
def __str__(self):
return f"Name: {self.name}, Age: {self.age}"
class Student(Person):
def __init__(self, name, age, course):
super().__init__(name, age)
self.course = course
def study(self):
print(f"Student is studying {self.course}")
class Instructor(Person):
def __init__(self, name, age, subject):
super().__init__(name, age)
self.subject = subject
def teach(self):
print(f"Instructor is teaching {self.subject}")
# Demonstration of polymorphism
student1 = Student("Alice", 20, "Mathematics")
instructor1 = Instructor("Bob", 40, "Physics")
print(student1) # Uses __str__ from Person
student1.study() # Calls study method from Student
print(instructor1) # Uses __str__ from Person
instructor1.teach() # Calls teach method from Instructor
# Part (d): Higher-order function for sorting students
def sort_students(student_list, key_function):
return sorted(student_list, key=key_function)
# Sample student list
students = [
{"student_id": 1, "name": "Alice", "age": 20, "course": "Mathematics"},
{"student_id": 2, "name": "Bob", "age": 22, "course": "Physics"},
{"student_id": 3, "name": "Charlie", "age": 19, "course": "Chemistry"}
]
# Demonstrate sorting by age
sorted_by_age = sort_students(students, key_function=lambda s: s["age"])
print("Students sorted by age:", sorted_by_age)
# Demonstrate sorting by name
sorted_by_name = sort_students(students, key_function=lambda s: s["name"])
print("Students sorted by name:", sorted_by_name)
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