How do you sort a list of custom objects?

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To sort a list of custom objects in Java or Python, you need to define the criteria on which the sorting should be based.

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In Java:

You sort custom objects using either:

1. Comparable interface – defines natural ordering.

2. Comparator interface – defines custom sorting.

Example:

java
class Student implements Comparable<Student> {
    String name;
    int age;

    public Student(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public int compareTo(Student s) {
        return this.age - s.age; // Sort by age
    }
}

// Sort using Comparable
Collections.sort(studentList);

// Sort using Comparator (by name)
Collections.sort(studentList, (a, b) -> a.name.compareTo(b.name));

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In Python:

Use the sorted() function or .sort() method with a key argument.

Example:

python
class Student:
    def __init__(self, name, age):
        self.name = name
        self.age = age

students = [Student("Alice", 22), Student("Bob", 20)]

# Sort by age
students.sort(key=lambda x: x.age)

# Sort by name
students.sort(key=lambda x: x.name)

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Key Points:

• In Java, use Comparable for natural ordering and Comparator for custom sorting.

• In Python, use lambda functions or attrgetter for sorting.

• Sorting custom objects helps in organizing data efficiently and is vital for operations like searching or ranking.

This technique is widely used in real-world applications like sorting users by score, products by price, or files by date.

Read more: 

What is the difference between Collection and Collections?

How does the fail-fast behavior work in collections?

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