Oops you forget ever to add the objects into the ArrayList.

import java.util.ArrayList;

public class PersonTester 
{
	public static void main(String[] args)
	{
		Man man = new Man();
		Woman woman = new Woman();
		
		ArrayList<Person> pArray = new ArrayList<Person>();
		
		for(Person p : pArray)
		{
			p.printGender();
		}
	}
}

Should become...

import java.util.ArrayList;

public class PersonTester 
{
	public static void main(String[] args)
	{
		Man man = new Man();
		Woman woman = new Woman();
		
		ArrayList<Person> pArray = new ArrayList<Person>();
	        pArray.add(man);   // added
                pArray.add(woman); // added	
		for(Person p : pArray)
		{
			p.printGender();
		}
	}
}

If you have implemented methods to encapsulate your data within a class and keep things private then you definitely should use this methods. Consider if a set method did something like truncate a string, how would you account for this in the constructor? reimplement the code in there?

class Example {
 private String databaseField;
 
 public Example(String databaseField) {
   this.setDatabaseField(databaseField);
 }
 
 public void setDatabaseField(String str) {
   this.databaseField = str.substring(0,10); // limit 10 chars
 }

 public void getDatabaseField() {
   return this.databaseField;
 }
}

Whilst this is just an example, what it means is that any changes required for assignment of a member variable can be delegated to the set method, as a result if all calls for assignment use this method then there is one point only that requires change should the variables policy need to be adjusted. This is preferable under almost all circumstances.

Because your third class is not extending any class.

class third {
  // foo
};

Should be either as you intend

class third : public base {
  // foo
};
// or perhaps
class third : public derived {
  // foo
};

From memory you could try using the delimiter property of the Scanner to ensure that the line is utilised.

Try something along the lines of Scanner in = new Scanner(System.in).useDelimiter("\n");

see here

Thanks for the tip Dormilich it is most appreciated. I will read up on implementing this into my code.

Regards