arraylist sort method java
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tutorial on arraylist sort method in java
in java, the `arraylist` class is part of the java collections framework and provides a resizable array implementation. one of the useful features of `arraylist` is the ability to sort its elements using the `collections.sort()` method or the `sort()` method available in the `arraylist` class itself.
overview of sorting in arraylist
1. **sorting with collections.sort()**: this method is part of the `java.util.collections` class. it sorts the elements of the list in natural order (for objects that implement the `comparable` interface) or according to a specified `comparator`.
2. **sorting with arraylist.sort()**: this method is available directly on the `arraylist` class and is similar to `collections.sort()`. it allows for sorting the list using a specified `comparator`.
prerequisites
basic understanding of java and its collections framework.
familiarity with the concept of `comparable` and `comparator`.
example scenario
let's create an example where we sort a list of `employee` objects based on their names and salaries.
step-by-step code example
step 1: create the employee class
step 2: sort employees by name
step 3: sort employees by salary
complete code
here’s the complete code combining both sorting methods:
explanation of the code
1. **employee class**: this class has two properties: `name` and `salary`, along with constructors, getters, `tostring`, `equals`, and `hashcode` methods.
2. **sorting by name**:
we use `collections.sort()` with a custom `comparator` to sort the `arraylist` based on the employee names in ascending order.
3. **sorting by salary**:
we use the `sort()` method of the `arraylist` with a lambda expression to sort the employees based on their salaries in ascending order.
conclusion
sorting an `arraylist` in java can be easily achieved using the `collections.sort()` method or the `arraylist.sort()` method. both methods allow for custom sorting using ...
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