Homework - Need help on my Homework im totally new to this

i was asked to write a program that will display a diamond and a hollow diamond. It need to ask the user to input the size and character, which to form the diamond, and must use 3 methods.

• Public static int checkSize(String size) – This method will return 6 if size equals “short”, 12 if size equals “average”, 24 if size equals “tall”, or -1 otherwise. Be sure that the comparison is not case sensitive.
• Public static void displayDiamond (int size, char ch) – This method will display a diamond of height size constructed from pattern character ch.
• Public static void displayHollowDiamond (int size, char ch) – This method will display a hollow diamond of height size constructed from pattern character ch.

in main method i had to use a do-while loop also, until the user input "short","average","tall", for size of 6,12,24.

an output of "short" should look like ( "o"means space
oo*
o***o
*****
*****
o***o
oo*

oo*
o*oo*o
*oooo*
*oooo*
o*oo*
oo*

And here is what i have so far (ive only completed the hollow diamond and no idea what to do for the other 2 methods.)

import java.util.Scanner;

public class Diamonds
{
public static void main(String[] args)
{
Scanner kb = new Scanner(System.in);
String input;
do
{
System.out.print("enter diamond size (\"short\", \"average\", or \"tall\"): ");
input = kb.nextLine();
}while();
System.out.print("enter pattern character: ");
char character = kb.nextChar();
}
public static int checkSize(String size)
{
if(size!=
}
public static void displayDiamond(int size, char ch)
{
}
public static void displayHollowDiamond(int size, char ch)
{
int i, j, k, l;
for(i=1, i<=size; i++)
k = i<=size/2 ? 2*1-1 : 2*(size-i+1)-1;
j = (size-k)/2;
for(l=0; l<k; l++)
System.out.print(" ");
for(l=0; l<k; l++)
if(l==0 || l==k-1)
System.out.print(ch);
else
System.out.print(" ");
System.out.println();
}
}

any hint and helps??

Please edit your post and wrap the code in code tags.
Does the code compile and execute without errors? Please post the full text of any error messages.
What does the program print out when it executes?

What causes the first do/while to exit the loop?