problem with assignment

Hi all i am currently doing an assignment and struggling like mad all i need to do is create a right angled triangle out of asterisks such as

*
**
***
****
*****

it has the size set to 5 and the orientation set to up all i need to know is how to get the public instance method called generate row to work correctly any help would be appreciated i am drowning i cannot get to grips with this at all.

the code for the method is below it should use a loop and concatenation to produce the triangle any help on this would be grateful.

import ou.*;

/**
* Class Triangle - instances model triangles as rows of asterisks
*
* M255 Course Team
* Version 1.0
*/
public class Triangle
{
/* instance variables */
int size; // the size of the triangle; an integer between 2 and 10 inclusive
String orientation; // either "up" or "down"
String asterisk;

/**
* Constructor for objects of class Triangle.
*/
public Triangle()
{
super();
this.size = 5;
this.orientation = "up";


}



/* instance methods */

/**
* Return the orientation of the triangle.
*/
public String getOrientation()
{
return this.orientation;
}

/**
* Return the size of the triangle.
*/
public int getSize()
{
return this.size;
}

/**
* Generates a row of Asterisks
*/
public String generateRow()
{
asterisk = "";
aSize = Integer.parseInt(return this.size);
for (int num = 1; num <= asize; num++)

asterisk = asterisk + "*";

System.out.prinln(asterisk);
}

}