What is Range.isStartedBy() in Java?
Overview
isStartedBy() is an instance method of the Range class that is used to check whether the range starts with the specified element.
How to import Range
We can find the definition of Range in the Apache Commons Lang package, which we can add to the Maven project by adding the following dependency to the pom.xml file:
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.12.0</version>
</dependency>
For other versions of the commons-lang package, refer to the Maven Repository.
We can import the Range class as follows:
import org.apache.commons.lang3.Range;
Syntax
public boolean isStartedBy(final T element)
Parameters
final T element: The element to check.
Return value
This method returns true if the specified element starts the range, else false.
Code
import org.apache.commons.lang3.Range;public class Main{public static void main(String[] args) {// Example 1int fromValue = 100;int toValue = 200;Range<Integer> range = Range.between(fromValue, toValue);int element = 100;System.out.println(range +" starts by " + element + " - " + range.isStartedBy(element));// Example 2element = 99;System.out.println(range +" starts by " + element + " - " + range.isStartedBy(element));}}
Explanation
Example 1
range = [100..200]element = 100
The method returns true because the element starts the range.
Example 2
range = [100..200]element = 99
The method returns false because the element does not start the range.
Output
The output of the code will be as follows:
[100..200] starts by 100 - true
[100..200] starts by 99 - false