Adding Error Message in the Visualforce page through Apex controller

Syntax : <apex:pageMessages ></apex:pageMessages>

Apex Controller:

public class ErrorMsgController {
public void DisplayError(){
Apexpages.addMessage( new ApexPages.Message (ApexPages.Severity.ERROR, ‘Required fields are missing. ‘)); //FATAL, WARNING, INFO, CONFIRM
}
}

VF Page:

<apex:page sidebar=”false” showHeader=”false” controller=”ErrorMsgController”>
<apex:form >
<apex:pageMessages ></apex:pageMessages>
<apex:commandButton value=”Click” action=”{!DisplayError}”/>
</apex:form>
</apex:page>

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