@Payal, isMultiple() method is used to check whether the SELECT element support multiple selecting options at the same time or not. This accepts nothing but returns boolean value(true/false). Syntax for this method is:
Boolean bool = selectElement.isMultiple()
Example:
if(selectElement.isMultiple())
{
System.out.println("Select tag allows multiple selection");
}
else
{
System.out.println("Select does not allow multiple selections");
}