How to call method in Apex without @RemoteAction

2. Call Method in salcesforce apex class without @RemoteAction

In Apex Class:

public void saveRanking() { // you code here}
In salesforce Page: 

// call method from apex class by clicking on button
<apex:commandButton styleClass="slds-button slds-button--neutral btn-refresh" reRender="mainForm" status="loadingStatus" action="{!saveRanking}" value="Save">
</apex:commandButton>

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