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keshin okawakeshin okawa 

Q>Need help with code about retrieving field names

I was able to utilize some code I found online and finally come up with this one..

public with sharing class Describer
public Map <String, Schema.SObjectType> schemaMap = Schema.getGlobalDescribe();
public List<Pair> lstfieldname{get;set;}
public List <Pair> fields {get{return lstfieldname;} set{lstfieldname =value;}}

// Intialize objectNames and fields
public Describer() {
    fields = new List<Pair>();

// Find the fields for WRAP Report Object

public void showFields() {

Map <String, Schema.SObjectField> fieldMap = schemaMap.get('Sample__c').getDescribe().fields.getMap();
for(Schema.SObjectField sfield : fieldMap.Values())
        schema.describefieldresult dfield = sfield.getDescribe();
        system.debug('#######' + dfield );
        Pair field = new Pair();
        field.key = dfield.getname();
        system.debug('#######4444' + field.key);
        field.val =dfield.getLabel ();

public class Pair
    public String key {get; set;}
    public String val {get; set;}

Visualforce page
<apex:page Controller="Describer">
    <apex:form id="Describe">
        <apex:pageBlock title="Salesforce Field">
            <apex:pageBlockTable value="{!fields}" var="fls" styleClass="table table-striped">
                <apex:column value="{!fls.val}"/>
                <!-- Header Generated automatically -->
The result was this


1. I need some kind of explanation about the flow of the class code (I know what the code does but i'm not familiar with most parts of it).
2. How do I sort the results alphabetically (to make it easier to locate a field)?
Best Answer chosen by keshin okawa
Shrikant BagalShrikant Bagal
@miczster masher,
For explanation please refer: 
and about sorting have you try for sort function of List.