Function Declare in Java 20

Sure, here's how to declare a method or function in Java 20 with examples:

Method Declaration Format:

   methodName(parameterList) {

   // method body

}

Here is an example of a function that calculates the sum of two integers:

public static int addNumbers(int a, int b) {
    int sum = a + b;
    return sum;
}

In this example, the method is named addNumbers, has an access modifier of public, a static/non-static keyword of static, a return type of int, and takes two integer parameters (a and b).

The method body consists of a single statement that adds the two parameters together and assigns the result to a local variable called sum. Finally, it returns the value of sum using the return keyword.

Here is another example of a method that outputs the square of a number:

public static void printSquare(int n) {
    System.out.println("The square of " + n + " is " + (n * n));
}

In this example, the method is named printSquare, has an access modifier of public, a static/non-static keyword of static, a return type of void (meaning it does not return a value), and takes a single integer parameter (n).

The method body consists of a single statement that prints a string to the console using System.out.println(). The string includes the original value of n and the square of n. There is no return statement, as the method does not return a value.

I hope that helps!