how to use ? with variable in java code example

Example: Variables in java

// local variable in java example
public class LocalVariableExample
{
   public void employeeDetails()
   {
      // local variable empAge and name
      int empAge = 22;
      String name = "Sachin";
   }
   public static void main(String[] args)
   {
      LocalVariableExample obj = new LocalVariableExample();
      // name and empAge cannot 
      // be resolved to a variable
      System.out.println("Employee name is : " + name + ", and age : " + empAge);
   }
}