What learning and educational resources are available for Java functions for intermediate developers?

For intermediate Java developers, functions are the building blocks of code, which can improve code efficiency and readability. This article provides a wealth of resources, including online tutorials, interactive programming environments and practical cases, to help developers deeply learn and improve their knowledge of Java functions, including: online tutorials and documentation interactive programming environment practical cases

Java function tutorials and educational resources: a must for advanced developers

In Java programming, functions are necessary building blocks for organizing code into reusable and maintainable modules. For intermediate developers, mastering functions is crucial because it improves code efficiency and readability. This article brings together various resources to help you learn more about and improve your knowledge of Java functions.

Online Tutorials and Documentation

• [Java Tutorial: Method](https://docs.oracle.com/javase/tutorial/java/javaOO/ methods.html)
• [Usage of functional programming in Java](https://www.baeldung.com/java-functional-programming)
• [Lambda expressions and method references ](https://www.tutorialspoint.com/java8/java8_lambda_expressions.htm)

Interactive Programming Environment

• [LeetCode]( https://leetcode.com/): Provides thousands of programming problems and solutions, many involving the application of functions.
• [CodinGame](https://www.codingame.com/): Online programming platform, including function-based challenges and tutorials.
• [HackerRank](https://www.hackerrank.com/): Provides a variety of programming questions to help you practice your skills in using functions.

Practical case

Use function to calculate prime numbers

import java.util.Scanner;

public class PrimeNumbers {

    public static boolean isPrime(int number) {
        if (number <= 1) {
            return false;
        }

        for (int i = 2; i <= Math.sqrt(number); i++) {
            if (number % i == 0) {
                return false;
            }
        }

        return true;
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.print("请输入一个数字：");
        int number = scanner.nextInt();

        if (isPrime(number)) {
            System.out.println(number + " 是一个质数。");
        } else {
            System.out.println(number + " 不是一个质数。");
        }
    }
}

Use lambda expression to execute on list Filter

import java.util.Arrays;
import java.util.List;

public class FilterList {

    public static void main(String[] args) {
        List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);

        List<Integer> evenNumbers = numbers.stream()
                .filter(n -> n % 2 == 0)
                .toList();

        System.out.println("偶数列表：" + evenNumbers);
    }
}

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