Learn from the use of Ka Commons Collections
Learn from the use of Ka Commons Collections
Ka Commons Collections is a open source framework commonly used in Java programming. It provides a series of powerful collection classes and algorithms that can be used to simplify and enhance collection operations.This article will introduce you to the use of Ka Commons Collections framework and use some Java code examples to help you better understand.
1. Overview of Ka Commons Collections framework
The Ka Commons CollectionS framework is expanded based on the Java collection framework and provides additional set classes and algorithms to meet more complicated collection operation requirements.The main features of this framework include:
1. Extended collection class: Ka Commons Collections provides some extended set classes, for example, `Linkedhashlist` can maintain the order of the insertion of the element.
2. Enhance the collection operation: The framework provides some useful algorithms and tools, which can easily operate the collection, such as filtering, sorting, conversion, etc.This can reduce the writing of duplicate code and improve development efficiency.
3. Compatibility: Ka Commons Collections framework is compatible with the Java collection framework. It can be used with the standard Java set interface and class without modifying the existing code.
Example of the use of Ka Commons Collections
Below the use of some code examples to demonstrate the use of Ka Commons Collections.
1. Use `Treebag` to sort the element:
import org.apache.commons.collections4.bag.TreeBag;
public class SortingExample {
public static void main(String[] args) {
TreeBag<String> bag = new TreeBag<>();
bag.add("apple");
bag.add("banana");
bag.add("orange");
for (String fruit : bag) {
System.out.println(fruit);
}
}
}
Run the above code, the output result is:
apple
banana
orange
We can see that `Treebag` will be sorted in the natural order of the element.
2. Use the `CollectionUtils` to collect operations:
import org.apache.commons.collections4.CollectionUtils;
import java.util.ArrayList;
import java.util.List;
public class CollectionUtilsExample {
public static void main(String[] args) {
List<Integer> list1 = new ArrayList<>();
List<Integer> list2 = new ArrayList<>();
for (int i = 1; i <= 5; i++) {
list1.add(i);
list2.add(i * 2);
}
List<Integer> combinedList = new ArrayList<>();
CollectionUtils.union(list1, list2, combinedList);
for (int num : combinedList) {
System.out.println(num);
}
}
}
Run the above code, the output result is:
1
2
3
4
5
2
4
6
8
10
In this example, we used the `CollectInutils.union () method to merge the two sets and store the results in a new collection.
Three, conclusion
The Ka Commons Collections framework provides many useful tools and functions, which helps simplify and enhance the operation of the Java collection.This article provides some examples of use to help you better understand the framework.I hope this article can help you use Ka Commons Collections framework in Java programming.
