public class Class_906F0000000DADAIA4 {
    public string conti{get; set;}
    public string contr{get; set;}
    public string stat{get; set;}
    public string regi{get; set;}
    public string city{get; set;}
    public Class_906F0000000DADAIA4(ApexPages.StandardController controller) { }
    public list<selectoption> getcontinentobj(){
        list<selectoption> options= new list<selectoption>();
        list<Continent__c> conti= [select name from Continent__c order by name];
        options.add(new selectoption('—-Select Anyone—-', '—-Select Anyone—-'));
        for(Continent__c c:conti){
            options.add(new selectoption(c.name,c.name));
		}
        return options;
	}
                                          
    public list<selectoption> getcontryobj(){        
        list<selectoption> options= new list<selectoption>();
        list<Country__c> contr= [select name  from Country__c where Continent__r.name=:conti];
        options.add(new selectoption('—-Select Continent—-', '—-Select Continent—-'));
        for( Country__c c:contr){
            options.add(new selectoption(c.name,c.name));
        }
        return options;
    }
    
    public list<selectoption> getstateobj(){        
        list<selectoption> options= new list<selectoption>();
        list<State_Provice__c> stat= [select name from State_Provice__c where Country__r.name=:contr];
        options.add(new selectoption('—-Select Country—-', '—-Select Country—-'));
        for(State_Provice__c s:stat){
            options.add(new selectoption(s.name,s.name));            
        }
        return options;
    }
    
    public list<selectoption> getregionobj() {
        list<selectoption> options= new list<selectoption>();
        list<County_Region__c> regi= [select name from County_Region__c  where State_Provice__r.name=:stat];
        options.add(new selectoption('—-Select State—-', '—-Select State—-'));                                              
        for(County_Region__c r:regi){ options.add(new selectoption(r.name,r.name)); }
        return options;
    }
    
    public list<selectoption> getcityobj(){                                              
        list<selectoption> options= new list<selectoption>();                                              
        list<City__c> city= [select name from City__c where County_Region__r.name=:regi];                                              
        options.add(new selectoption('—-Select Region—-', '—-Select Region—-'));
        for(City__c c:city){ options.add(new selectoption(c.name,c.name)); }
        return options;
    }
}

<apex:page standardController=”Continent__c” extensions=”MultilevelDependentPicklist”>
    <apex:sectionHeader title=”Find your location” subtitle=”{!Continent__c.name}”/>
        <apex:form >
            <apex:pageBlock title=”Location” mode=”edit”>
                <apex:pageBlockSection columns=”1″>
                    <apex:pageblockSectionItem ><apex:outputLabel value=”Continent Name”/>
                        <apex:outputPanel styleClass=”requiredInput” layout=”block”>
                        <apex:outputPanel styleClass=”requiredBlock” layout=”block”/>
                            <apex:selectList size=”1″ value=”{!conti}”>
                                <apex:selectoptions value=”{!continentobj}”/>
                                <apex:actionSupport event=”onchange” reRender=”country”/>
                            </apex:selectList>
                        </apex:outputPanel>            
                    </apex:pageblockSectionItem>
                    <apex:pageblockSectionItem >
                        <apex:outputLabel value=”Country Name”/>
                        <apex:selectList size=”1″ value=”{!contr}” id=”country”>
                            <apex:selectoptions value=”{!contryobj}”/>
                            <apex:actionSupport event=”onchange” reRender=”states”/>
                        </apex:selectList>
                    </apex:pageblockSectionItem>
                    <apex:pageblockSectionItem >
                        <apex:outputLabel value=”State / Provice”/>
                        <apex:selectList size=”1″ value=”{!stat}” id=”states”>
                            <apex:selectoptions value=”{!stateobj}”/>
                            <apex:actionSupport event=”onchange” reRender=”regions”/>
                        </apex:selectList>
                    </apex:pageblockSectionItem>
                    <apex:pageblockSectionItem >
                        <apex:outputLabel value=”County / Region”/>
                        <apex:selectList size=”1″ value=”{!regi}” id=”regions”>
                            <apex:selectoptions value=”{!regionobj}”/>
                            <apex:actionSupport event=”onchange” reRender=”cities”/>
                        </apex:selectList>
                    </apex:pageblockSectionItem>
                    <apex:pageblockSectionItem >
                        <apex:outputLabel value=”City”/>
                        <apex:selectList size=”1″ value=”{!city}” id=”cities”>
                            <apex:selectoptions value=”{!cityobj}”/>
                            <apex:actionSupport event=”onchange” reRender=”village”/>
                        </apex:selectList>
                    </apex:pageblockSectionItem>
                </apex:pageBlockSection>
            </apex:pageBlock>
        </apex:form>
</apex:page>