What is a Method and how to create a Method in Apex?

What is a Method and how to create a Method in Apex?

A Method is a collection of statements that are grouped together to perform an operation.

void doNothing() {}

void doNothingWithArgs(String a, Integer b, Date c) {}

void returnsNothing() { Integer i = 1; }

Integer returnsInteger() { return 2009; }

Creating a Method:

In general, a method has the following syntax:

modifier returnValueType methodName(list of parameters) {

  // Method body;

}

A method definition consists of a method header and a method body. Here are all the parts of a method:

Modifiers: The modifier, which is optional, tells the compiler how to call the method. This defines the access type of the method.

Return Type: A method may return a value. The returnValueType is the data type of the value the method returns. Some methods perform the desired operations without returning a value. In this case, the returnValueType is the keyword void.

Method Name: This is the actual name of the method. The method name and the parameter list together constitute the method signature.

Parameters: A parameter is like a placeholder. When a method is invoked, you pass a value to the parameter. This value is referred to as actual parameter or argument. The parameter list refers to the type, order, and number of the parameters of a method. Parameters are optional; that is, a method may contain no parameters.

Method Body: The method body contains a collection of statements that define what the method does.

Ex:-

public static integer  max(integer num1, integer num2) {

      integer result;

      if (num1 > num2)

         result = num1;

      else

         result = num2;

      return result;

   }

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