Why Getting error Cannot Return a List of Strings - Void method must not return a value?
I've been using the notes from Simple Apex class to return a list of strings. I am having trouble getting this code to work. I'm writing a simple Apex Class as part of the Trailhead module Getting Started with Apex. Here's what I'm trying to do:
Create an Apex class that returns an array (or list) of formatted strings ('Test 0', 'Test 1', ...). The length of the array is determined by an integer parameter
The Apex class must be called 'StringArrayTest' and be in the public scope.
The Apex class must have a public static method called 'generateStringArray'.
The 'generateStringArray' method must return an array (or list) of strings. Each string must have a value in the format 'Test n' where n is the index of the current string in the array. The number of returned strings is specified by the integer parameter to the 'generateStringArray' method.
Code
public class StringArrayTest { // Public Method public static void generateStringArray (Integer length) { // Instantiate the list String[] myArray = new List(); // Iterate through the list for(Integer i=0;i Error Message
Void method must not return a value
I thought the method must have a return type but getting an error message that the Void method must not return a value. How to resolve this error?
The reason behind getting this error is that you have declared your return type as void. Change it to List.
Incorrect
public static void generateStringArrayCorrect
public static List generateStringArrayIt would be worth your time to read up on Class Methods:
To define a method, specify the following:
Optional: Modifiers, such as public or protected.
Required: The data type of the value returned by the method, such as String or Integer. Use void if the method does not return a value.
Required: A list of input parameters for the method, separated by commas, each preceded by its data type, and enclosed in parentheses (). If there are no parameters, use a set of empty parentheses. A method can only have 32 input parameters.
Required: The body of the method, enclosed in braces {}. All the code for the method, including any local variable declarations, is contained here. Use the following syntax when defining a method:
[public | private | protected | global] [override] [static] data_type method_name (input parameters) { // The body of the method }It is your data_type that you have incorrectly specified as void in this case.