Question:

Consider the following method declaration in Java:

public static void calculateSum(int[] array) {
    int sum = 0;
    for (int i = 0; i < array.length; i++) {
        sum += array[i];
    }
    System.out.println("The sum of the elements in the array is: " + sum);
}

a) Explain the access modifiers used in the method declaration.

b) Identify the return type and explain its significance in the context of this method.

c) Write the syntax to invoke this method from a different class, passing an integer array as an argument.

Answer:

a) In the given method declaration, the access modifiers used are public and static.

• The public modifier makes the method accessible from anywhere in the program. Other classes, even in different packages, can access this method.
• The static modifier makes the method a class-level method. It can be called without creating an instance of the class.

b) The given method has a return type of void.

• void indicates that the method does not return any value. In Java, methods with a void return type are used for performing actions or executing code rather than returning a value.

c) To invoke the calculateSum method from a different class, passing an integer array as an argument, use the following syntax:

int[] numbers = {1, 2, 3, 4, 5};
ClassName.calculateSum(numbers);

• ClassName refers to the name of the class where the calculateSum method is defined.
• numbers is an integer array that is passed as an argument to the method.

By calling ClassName.calculateSum(numbers);, the method will calculate the sum of the elements in the array and print the result as output.

Note: Replace ClassName with the actual name of the class where the calculateSum method is defined.