JSWEET CORE: The core framework recommended in the Java class library
JSWEET CORE: The core framework recommended in the Java class library
Overview:
JSWEET CORE is a framework for converting Java code into JavaScript, which aims to help developers use the core framework more efficiently in the Java library.This article will introduce some techniques of JSweet Core and provide some Java code examples.
1. Import statement using JSweet Core
When using JSWEET CORE to convert Java to JavaScript, we first need to import the JSWEET CORE library.Can be imported in the following way:
import static jsweet.util.Globals.*;
import jsweet.lang.Global;
The above two import statements introduced the `jsweet.util.globals` class and` jsweet.lang.global` class.These classes include some global functions and variables provided by the JSweet Core library.
2. Convert java objects to JavaScript
JSWEET CORE allows developers to convert Java objects into JavaScript objects and retain the types and structures of the original object.The following is a conversion example:
public class Person {
public String name;
public int age;
public Person(String name, int age) {
this.name = name;
this.age = age;
}
}
public class Main {
public static void main(String[] args) {
Person person = new Person("John", 25);
Global.JSON.stringify(person);
}
}
In the above example, we created a `Person` class and converted it to the JavaScript object for further processing.You can use the `global.json.stringify` function to convert it into a string.
3. Type annotation of using JSweet Core
In order to better use the type inspection mechanism of JSweet Core, you can use type annotations to specify variables, methods and classes.The following is an example of annotations:
import static jsweet.util.Globals.*;
class MathUtils {
public static void main(String[] args) {
int sum = add(2, 3);
System.out.println(sum);
}
@SuppressWarnings("unchecked")
public static int add(int a, int b) {
return (int) (JSweetCoreUtils.toJSNumber(a) + JSweetCoreUtils.toJSNumber(b));
}
}
In the above example, we used some tool functions in the `jsweet.util.globals` class, such as` jsweetCoreutills.tojsnumber` to convert the Java code into JavaScript code.
Fourth, use the type of JSweet Core
When using JSWEET CORE, you can use the type conversion function to convert the Java type into the JavaScript type.Here are some examples:
import static jsweet.util.Globals.*;
public class Main {
public static void main(String[] args) {
double num = JSweetCoreUtils.toJSNumber(10);
boolean bool = JSweetCoreUtils.toJSBoolean(true);
String str = JSweetCoreUtils.toJSString("Hello");
System.out.println(num);
System.out.println(bool);
System.out.println(str);
}
}
In the above example, we used the `jsweetCoreUtils.tojsnumber`,` jsweetCoreutils.tojsboolean` and `jsweetcoreutils.tojsstring` functions, respectively converted java types into Numba's Numba Numba. ER, BOOLEAN and String types.
in conclusion:
Through the core framework of JSWEET CORE introduced herein, you can use the JSweet Core library to develop more efficiently in the Java library.By importing JSweet Core libraries, conversion of Java objects to JavaScript, use type annotation and type conversion function, you can easily convert Java code into JavaScript, and use the function of native JavaScript.
I hope this article will bring some guidance and help to the use of JSWEET CORE.
