Uncovering the Mystery of Java Function Excellence

Functions in Java are defined by the method keyword, which is used to organize code and improve maintainability. Its basic syntax is: (). The access modifier specifies function visibility (such as public, protected, private), the return type specifies the function return value (no return value is void), the method name is a unique identifier, and the parameters are used to pass data.

Uncover the mystery of Java function excellence

In Java, functions are defined by using the method keyword to define. It allows you to organize your code into reusable chunks, thereby improving readability and maintainability.

Basic syntax of function:

<access_modifier> <return_type> <method_name>(<parameters>) {
    // 函数体
}

1. Access modifier:

• public: Visible from anywhere.
• protected: Visible from the same package and its subclasses.
• private: Visible only within the current class.

2. Return type:

• The type returned by the function. If there is no return value, it is designated as void.

3. Method name:

• The unique identifier of the function must follow the Java naming convention.

4. Parameters:

• The data passed to the function can be any Java type.

Practical example:

Suppose we want to create a function that calculates the product of two numbers:

public class Multiply {

    public int multiply(int num1, int num2) {
        return num1 * num2;
    }

    public static void main(String[] args) {
        Multiply multiply = new Multiply();
        int result = multiply.multiply(10, 5);
        System.out.println("乘积为：" + result);
    }
}

In this example:

• public int multiply(int num1, int num2) is a public function that accepts two integers as parameters and returns their product.
• public static void main(String[] args) is the entry point of the program, it instantiates the Multiply class and calls multiply() function.

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