What educational resources are available for self-learners on Java functions?

Self-learners learning Java functions can take advantage of the following resources: Oracle Java Tutorials and IBM Java Functions documentation provide basics and usage. Interactive environments like Codecademy and HackerRank provide instant feedback and practice. LeetCode provides high-quality algorithm problems to further test skills. Practical cases demonstrate the application of Java functions in calculating the area of ​​a circle and checking prime numbers.

Java Function Tutorial: An educational resource for self-learners

Learning Java functions is an important step in mastering the Java programming language. These resources are designed to provide self-learners with step-by-step guides, examples, and practical exercises to help them understand and use Java functions.

Tutorials and Documentation

• Oracle Java Tutorials: Functions: Official tutorial covering the basics, syntax, and usage of Java functions.
• Java Functions: Comprehensive documentation from IBM, including function declarations, parameters, and return values.
• Java Functions in Depth: Baeldung's detailed guide that dives into function types, lambda expressions, and method references.

Interactive Programming Environment

• Codecademy: Java Functions: Interactive course with instant feedback and step-by-step guidance.
• HackerRank: Java Functions: Challenge platform with tons of practice questions and puzzles to test your skills.
• LeetCode: Java Function Problems: Another challenge platform known for its high-quality algorithm problems.

Practical case

Case 1: Calculate the area of ​​a circle

import java.util.Scanner;

public class CircleArea {

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

        // 从用户输入半径
        System.out.println("请输入圆的半径：");
        double radius = scanner.nextDouble();

        // 定义一个函数来计算面积
        double calculateArea(double radius) {
            return Math.PI * radius * radius;
        }

        // 打印计算出的面积
        System.out.println("圆的面积为：" + calculateArea(radius));
    }
}

Case 2: Check whether the number is a prime number

public class PrimeNumberCheck {

    public static boolean isPrime(int number) {
        // 1 不是质数
        if (number == 1) {
            return false;
        }

        // 检查数字是否能被 2 到其平方根之间的任何数字整除
        for (int i = 2; i <= Math.sqrt(number); i++) {
            if (number % i == 0) {
                return false;
            }
        }

        // 如果循环结束并且没有发现因子，则数字为质数
        return true;
    }

    public static void main(String[] args) {
        int number;

        // 从用户输入数字
        number = Integer.parseInt(args[0]);

        // 调用 isPrime 函数检查数字
        if (isPrime(number)) {
            System.out.println(number + " 是质数。");
        } else {
            System.out.println(number + " 不是质数。");
        }
    }
}

Through these resources and practical cases, self-learners can have an in-depth understanding of Java functions and master their use in practical applications.

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