Comparison of Java functions across different platforms and languages

Introduction to comparing Java functions across platforms and languages: Java functions can be executed on Linux, Windows, macOS, AWS Lambda, Google Cloud Functions, and Azure Functions. Supports multiple languages, including Java, Python, JavaScript and Go. The practical case shows a Java function that calculates the area of ​​a circle and executes it on different platforms and languages.

Comparison of Java functions across different platforms and languages

Introduction

Java A function is a reusable block of code that can be executed across multiple platforms and languages. They are implemented using GraalVM and utilize Substrate VM to achieve fast startup and low memory usage of functions.

Support of different platforms and languages

Java functions can be executed on the following platforms:

• Linux
• Windows
• macOS
• Amazon Web Services Lambda
• Google Cloud Functions
• Azure Functions

They also support multiple languages, Including:

• Java
• Python
• JavaScript
• Go

Practical case

The following is a simple Java function for calculating the area of ​​a circle:

import com.oracle.graal.api.Context;
import com.oracle.graal.api.PolyglotAccess;
import java.util.HashMap;
import java.util.Map;

public class CircleAreaFunction {

    public static void main(String[] args) {
        Context context = Context.newBuilder().build();
        PolyglotAccess access = context.getPolyglotAccess();

        // 创建函数的输入值
        Map<String, Object> input = new HashMap<>();
        input.put("radius", 5);

        // 执行函数
        Object result = access.invoke(
            "js",
            "function area(radius) { return Math.PI * radius * radius; }",
            input
        );

        // 打印函数输出
        System.out.println(result.toString());
    }
}

Cross-platform and language execution

This function can be used in different platform and language. For example, to execute it in JavaScript, you can use the following command:

node --js-flag=--expose-graal js --eval "$(cat CircleAreaFunction.java)"

This will output the area of ​​the circle:

78.53981633974483

Conclusion

Java Function Provides the ability to seamlessly execute code across different platforms and languages. This simplifies the development and maintenance of distributed applications and provides the flexibility to reuse functions in a variety of environments.

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