Learn how to integrate and use leola programming language in the Java class library
Learn how to integrate and use leola programming language in the Java class library
Leola is a dynamic script language that allows developers to create Java applications faster and flexibly.This article will introduce how to integrate and use Leola's programming language in the Java library.If you have a certain understanding of Java and Leola, then you will be able to master this process quickly.let's start!
The first step is to add Leola language interpreter to your Java project.You can download the latest version of the LEOLA interpreter on Leola's official website.After decompression, you can add Leola's jar file to your Java path.For example, you can add the following dependencies in the Maven project to the pom.xml file:
<dependency>
<groupId>io.leola</groupId>
<artifactId>leola-core</artifactId>
<version>1.0.0</version>
</dependency>
Once you add the dependency item of the Leola interpreter, you can start using Leola in the Java library.
We will start in a simple example.Suppose you have a Java class library that defines a `Calculator` class, which has a way to execute the addition and subtraction operations.We will use Leola to write a script, which will use the `Calculator` class to perform some calculations.The following is an example code of the `Calculator` class:
public class Calculator {
public int add(int a, int b) {
return a + b;
}
public int subtract(int a, int b) {
return a - b;
}
}
In Leola, we can use the `Import` statement to import the Java class library, and use the` java` naming space to reference the Java class.Below is a script written in Leola:
leola
import java Calculator;
var calc = Calculator();
var result = calc.add(5, 3);
Println (result); // Output: 8
result = calc.subtract(10, 2);
Println (result); // Output: 8
In the above example, we introduced the `Calculator` class and created a` Calculator` object `Calc`.We can call the `add 'and` subtract` method of `CALC` and print the results like calling the java method, and print the result.
To execute the above Leola script in the Java library, we need to write some Java code.The following is an example:
import leola.runtime.Leola;
import leola.runtime.LeolaRuntimeException;
import leola.runtime.LeolaRuntime;
import leola.runtime.builtin.JavaBuiltin;
public class LeolaIntegrationExample {
public static void main(String[] args) {
try {
initLeolaRuntime();
executeLeolaScript();
} catch (LeolaRuntimeException e) {
e.printStackTrace();
} finally {
LeolaRuntime.cleanUp();
}
}
private static void initLeolaRuntime() {
Leola leola = new Leola();
leola.getMaestro()
.loadLibrary(JavaBuiltin.getInstance());
LeolaRuntime.setLeola(leola);
}
private static void executeLeolaScript() {
String script = "import java Calculator;
" +
"var calc = Calculator();
" +
"var result = calc.add(5, 3);
" +
"println(result);
" +
"result = calc.subtract(10, 2);
" +
"println(result);
";
LeolaRuntime.execute(script);
}
}
In the above example, we first initialized the LEOLA running environment.We created a Leola object and loaded the Java built -in library.Then, we use the `setleola` method to set the LEOLA environment to the global environment when running.
Next, we wrote a `Executelelascript` method to execute the LeOLA script.We pass the leola script as a string to the `Execute` method, and Leola will explain and execute the script.
Finally, we called the `Initleolaruntime` and` ExecuteleolaScript` and handled the possible `leolaruntimeException``.
Now, you have learned how to integrate and use Leola programming language in the Java library.You can write the leola script to call the Java class library to achieve more flexible and dynamic applications.Let's start using leola!
