Method Parameters

Java Method Parameters

In Java, method parameters are variables declared within the parentheses of a method declaration. They allow you to pass data into a method when it is called, enabling the method to perform its task with the provided information. Here's an overview of Java method parameters:

Syntax

        returnType methodName(parameterType1 parameterName1, parameterType2 parameterName2, ...) {
            // Method body
        }
      

Example

        public void greet(String name) {
            System.out.println("Hello, " + name + "!");
        }
      

Types of Parameters

1. Primitive Parameters: Parameters that hold primitive data types such as int, double, char, etc.

        public void printNumber(int number) {
            System.out.println("Number: " + number);
        }
      

2. Reference Parameters: Parameters that hold references to objects.

        public void processArray(int[] arr) {
            // Method logic to process the array
        }
      

3. Varargs Parameters: Introduced in Java 5, varargs (variable-length arguments) allow methods to accept a variable number of arguments of the same type.

        public int sum(int... numbers) {
            int result = 0;
            for (int num : numbers) {
                result += num;
            }
            return result;
        }