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Example Zero: How to convert an array to an ArrayList in Java using the constructor.
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| @Grab(group='com.jamonapi', module='jamon', version='2.82') | |
| import com.jamonapi.Monitor | |
| import com.jamonapi.MonitorFactory | |
| import static java.util.Arrays.asList | |
| import java.util.stream.Collectors; | |
| import java.util.List; | |
| import java.util.Arrays; | |
| import java.util.Random | |
| def random = new Random() | |
| def arrayCapacity = 10000 | |
| def numbers = new java.lang.Integer[arrayCapacity + 1] | |
| for (int ctr in 0..arrayCapacity) { | |
| numbers[ctr] = java.lang.Integer.valueOf(random.nextInt()) | |
| } | |
| def iterations = 100000 | |
| def monitor = MonitorFactory.start("Convert an array to an ArrayList performance monitor via the constructor example") | |
| for (ctr in 0..iterations) { | |
| def tempResult = asList (numbers) | |
| def result = new java.util.ArrayList (tempResult) as java.util.List | |
| } | |
| monitor.stop () | |
| println "iterations: $iterations, performance: $monitor" | |
| return; |
Note that the previous version of this script used a primitive int, which caused autoboxing to take place on line 28. This update removes the autoboxing requirement by creating an array of type java.lang.Integer on line 16.
Performance with autoboxing: ~179.3 seconds
Performance without autoboxing: ~ 721.8 ms
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See the following article: How To Convert An Array To An ArrayList In Java!