Update a sObject record related with another sObject using Visualforce

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In this part, I am going to explain how to update a contact record related to an account object in the visualforce page.

 Scenario--

  A VF Page showing a list of account record with a radio button and when you select an account from given list then it shows related contacts of selected account in the page and then you can update your record.

 Controller--

 public with sharing class AllAccounts 
{
    public List<Account> acList {get;set;}
    public List<Contact> conList {get;set;}   
    public string accId {get;set;}
    public string eml {get;set;}
    
    public AllAccounts()
    {   
        acList = new List<Account>();
        for(Account a : [select id,name,accountnumber from account limit 10])
        {
            acList.add(a);
        }
    }
    
    public void showContact()
    {
        conList = new List<Contact>();
        for(contact c : [select id,firstname,lastname,email,leadsource from contact where accountid =: accId])
        {
            conList.add(c);
        }      
    }
    
    public void save()
    {
        update conList;
    }

}
Visualforce Page--

 <apex:page controller="AllAccounts" >

   <apex:form >
      <apex:pageBlock title="Accounts">
          <apex:pageBlockTable value="{!acList}" var="ac">
              <apex:column width="10px">
                    <input type="radio" name="group1" />
                    <apex:actionSupport event="onclick" action="{!showContact}" ReRender="lab" >
                        <apex:param assignTo="{!accId}" name="accname" value="{!ac.id}"/>
                    </apex:actionSupport>
                </apex:column>
              <apex:column >
                 <apex:facet name="header">AccountName</apex:facet><apex:outputField value="{!ac.name}"/>
              </apex:column>
              <apex:column >
                  <apex:facet name="header">AccountNumber</apex:facet><apex:outputField value="{!ac.accountnumber}"/>
              </apex:column>
          </apex:pageBlockTable>
          
          <apex:pageBlock id="lab">
              <apex:outputPanel rendered="{!conList.size == 0}">
                  <b>No records for this account</b>
              </apex:outputPanel>
              
              <apex:outputPanel rendered="{!conList.size != 0}">                                 
                  <apex:pageBlockTable value="{!conList}" var="cn">
                      <apex:column value="{!cn.firstname}"/>
                      <apex:column value="{!cn.lastname}"/>
                      
                      <apex:column ><apex:facet name="header">Email</apex:facet><apex:inputField value="{!cn.email}" /></apex:column>                                                                                           
                      <apex:column ><apex:facet name="header">Leadsource</apex:facet><apex:inputField value="{!cn.leadsource}"/></apex:column>
                      
                      <apex:param name="em" value="{!eml}" assignTo="{!em}"/>
                  </apex:pageBlockTable>
          </apex:outputPanel>
          
          <apex:commandButton value="Save" action="{!save}" reRender="lan"/>
          </apex:pageBlock>
          
      </apex:pageBlock>
  </apex:form>

</apex:page>
Output--

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