what is list used for in salesforce?

Hi Sushant,

The List<SelectOption> is used to show the dynamic drop-down value on the visualforce page.

For Eg:-

Apex Controller:-

public class sampleCon {

String[] countries = new String[]{};

public PageReference test() {
return null;
}

public List<SelectOption> getItems() {
List<SelectOption> options = new List<SelectOption>();
options.add(new SelectOption('US','US'));
options.add(new SelectOption('CANADA','Canada'));
options.add(new SelectOption('MEXICO','Mexico'));
return options;
}

public String[] getCountries() {
return countries;
}

public void setCountries(String[] countries) {
this.countries = countries;
}

}

Visualforce Page:-

<apex:page controller="sampleCon">
<apex:form>
<apex:selectCheckboxes value="{!countries}">
<apex:selectOptions value="{!items}"/>
</apex:selectCheckboxes><br/>
<apex:commandButton value="Test" action="{!test}" rerender="out" status="status"/>
</apex:form>
<apex:outputPanel id="out">
<apex:actionstatus id="status" startText="testing...">
<apex:facet name="stop">
<apex:outputPanel>
<p>You have selected:</p>
<apex:dataList value="{!countries}" var="c">{!c}</apex:dataList>
</apex:outputPanel>
</apex:facet>
</apex:actionstatus>
</apex:outputPanel>
</apex:page>