<!-- call custom controller -->
<apex:page controller="DVUController">
    <apex:form id="form">

        <apex:pageBlock title="Welcome {!$User.FirstName} to the Data Validation Utilities Page">

            <apex:pageBlockSection columns="5">

                <apex:pageblocksection title="Select Object" columns="1">
                    <apex:selectList value="{!selectedObject}" size="1">
                        <apex:selectOptions value="{!objectOptions}" />
                        <apex:actionSupport reRender="form" event="onchange" />
                    </apex:selectList>
                </apex:pageblocksection>

                <apex:pageblocksection title="Picklist Fields" columns="1">
                    <apex:pageblocktable value="{!picklistfields}" var="results">
                        <apex:column value="{!results}"></apex:column>
                    </apex:pageblocktable>
                </apex:pageblocksection>

                <apex:pageblocksection title="Select Picklist Field" columns="1">
                <apex:selectList value="{!selectedPicklistField}" size="1">
                        <apex:selectOptions value="{!pickListFieldOptions}" />
                    </apex:selectList>
                </apex:pageblocksection>

                <apex:pageblocksection title="Picklist Values" columns="1">
                <apex:pageblocktable title="Picklist Field Values" value="{!picklistvalues}" var="results">
                        <apex:column title="Picklist Field Values" value="{!results}"></apex:column>
                </apex:pageblocktable>
                </apex:pageblocksection>

            </apex:pageblocksection>
        </apex:pageBlock>
    </apex:form>
</apex:page>

public class DVUController {

public String selectedObject { get; set; }
public String selectedField { get; set; }
public String selectedPicklistField { get; set; }
public List<String> picklistFields=new List<String>();
public List<String> picklistValues=new List<String>();


//generate list of Objects from the Org using Dynamic Apex

public SelectOption[] getObjectOptions() {
    SelectOption[] results = new SelectOption[] { new SelectOption('','-- none --') };
    for(SObjectType sobjectType: Schema.getGlobalDescribe().values()) {
        DescribeSObjectResult dsrao = sobjectType.getDescribe();
        results.add(new SelectOption(dsrao.getName(), dsrao.getLabel()));
        results.sort();
    }
    return results;
}

 //generate list of names of PicklistFields and MultiPicklistFields from the Object

 public List<String> getPicklistFields(){
    if(selectedObject != NULL){
        //picklistfields = new List<String>();
        Schema.DescribeSObjectResult dsr = Schema.getGlobalDescribe().get(selectedObject).getDescribe();
        Map<String,Schema.SObjectField> fieldMap = dsr.fields.getMap();
        for(String fieldName : fieldMap.keySet()) {
            Schema.SObjectField field = fieldMap.get(fieldName);
            Schema.DescribeFieldResult dfr = field.getDescribe();
               if( dfr.getType()==Schema.DisplayType.Picklist || dfr.getType()==Schema.DisplayType.MultiPicklist ) {
                  picklistfields.add(fieldName);
               }
            system.debug('==>picklistfields==>'+picklistfields);
        }
        return picklistfields;
    }
    return NULL;
}

 //generate list of PicklistFields from the Object as a dropdown

public SelectOption[] getPicklistFieldOptions() {
    SelectOption[] results = new SelectOption[] { new SelectOption('','-- none --') };
    if(selectedObject != null) {
        for(SObjectField sObjectField: Schema.getGlobalDescribe().get(selectedObject).getDescribe().fields.getMap().values()) {
            DescribeFieldResult dfr = sObjectField.getDescribe();
            if( dfr.getType()==Schema.DisplayType.Picklist || dfr.getType()==Schema.DisplayType.MultiPicklist ) {
            results.add(new SelectOption(dfr.getName(), dfr.getLabel()));
            results.sort();
        }
    }
    }
    return results;
}

//generate list of Picklistvalues from the Picklist selected

 public List<String> getPicklistValues(){
         if(selectedPicklistField != NULL && selectedObject != NULL){
         //pickListValues = new List<String>();
         Schema.DescribeSObjectResult dsr = Schema.getGlobalDescribe().get(selectedObject).getDescribe();
         Map<String,Schema.SObjectField> fieldMap = dsr.fields.getMap();
            for(String fieldName : fieldMap.keySet()) {
            Schema.SObjectField field = fieldMap.get(fieldName);
            Schema.DescribeFieldResult dfr = field.getDescribe();
            List<Schema.PickListEntry> picks = dfr.getPicklistValues();
            for(Schema.picklistentry v:picks){
            pickListValues.add(v.getValue());
             system.debug('==>pickListValues==>'+pickListValues);
     }
     return picklistValues;
 }

    }
    return picklistValues;
    }

  }