Methods

A method in Java is a collection of statements that are grouped together to perform an operation, it has inputs (can be multiple) and a single output (the return value).

Structure of a method is as follows:

private static double findAverage(double[] numbers) {
    // Method Body
    double sum = 0.0;
    for (double e : numbers)
        sum += e;
    return sum / numbers.length;
}

• private static double findAverage(double[] numbers) is the method header.

• double is the return type.

• findAverage is the method name.

• double[] numbers are the method parameters.

• Methods may have a return statement, they do not need to have it if their return type is void.

Method Calls:

private static int max(int a, int b) {
    int result = a;
    if (b > a) 
    result = b;
    return result;
}

int input1 = 5;
int input2 = 8;

int o = max(input1,input2);

When we call max with input1 and input2, they are Argument Values. They are passed to the method parameters int a and int b.

Result is passed to the output variable o.