[SalesForce] calling apex method without a return value from controller

I am trying to call an apex method through a controller. I have read somewhere the apex methods without any return should be prefixed with get. I am not sure what I am doing wrong here. It says cant find the method.
here is the apex:

        for (Opportunity opp : [Select Id, Name, StageName from Opportunity]) {
        opp.StageName = 'Won';
        update opp;
    }

Here is the call from the controller:

changeStageBackWon : function(component, event, helper) {
    var updateOpportunityStageBackWon = component.get("c.getMoveOppBackWon");
    //updateOpportunityStageBackWon.setParams({ opps : component.get("v.opportunityData") });
    updateOpportunityStageBackWon.setCallback(this, function(response) {
        var state = response.getState();            
        if (state === "SUCCESS") {
            var result = response.getReturnValue();
            console.log(result);
        }            
    });
    $A.enqueueAction(updateOpportunityStageBackWon); 
}

Best Answer

In all Apex methods, that are not returning something back, we will need to declare them as void. So you need to do something like this: 

public static void theVoidMethod(){

// Your code here 

}

or 

public void theVoidMethod2(){

    // Your code here 

    }

Check this link to learn more about Apex methods.

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