Please help... assignment for school

Write a Java program that prompts the user to enter the size of a square from 1 to 20 (inclusive) and then displays a hollow square of that size made of the character uppercase ‘X’. If the user inputs an invalid number, the program should prompt them repeatedly until their input is in the allowable range.

Examples of the output:

Enter the square size from 1 – 20: 7
XXXXXXX
X______X
X______X
X______X
X______X
X______X
XXXXXXX

Enter the square size from 1 – 20: 1
X

Enter the square size from 1 – 20: 2
XX
XX

So far i got this:

import java.util.Scanner;

public class Square1 {
public static void main(String[] args) {

Scanner keyInput = new Scanner(System.in);


int lo = 1;
int hi = 20;
int squareSize;


do
{

System.out.print("Enter the square size from 1 - 20: ");
squareSize = keyInput.nextInt();
}
while (squareSize >= lo ^ squareSize <= hi);


}
}

damn the square doesnt show correctly for 7. the second column should be on the right

got this so far, but the square is not hollow, HELP!!
__________________________________________________ ______________

import java.util.Scanner;

public class HollowSquare2 {
public static void main(String[] args) {

Scanner keyInput = new Scanner(System.in);


int lo = 1;
int hi = 20;
int squareSize;

int rowCounter = 0;
int columnCounter = 0;

do
{

System.out.print("Enter the square size from 1 - 20: ");
squareSize = keyInput.nextInt();
}
while (squareSize >= lo ^ squareSize <= hi);

while (rowCounter < squareSize)
{
// Loop produce columns
while (columnCounter < squareSize)
{
if (rowCounter &#37; 2 == 0)
{
System.out.print("X");
}
else
System.out.print("X");
columnCounter++;
}

// Increment and reset for the next row
rowCounter++;
columnCounter = 0;
System.out.println();
}






}
}

erm, well i don't know about ur while loop is it necessary for ur assignment but i change it to for loop it works fine.... hope u don't mind the while and for though.... but this is what i got just put this as ur while loop

Code:

---

                for (int i=0; i<squareSize; i++) {
                        System.out.print("X");
                }

                for (int i=1; i<squareSize-1; i++) {
                        System.out.print("\nX");

                        for (int j=1; j<squareSize-1; j++) {
                                System.out.print("-");
                        }
                        System.out.print("X");
                }
                if (squareSize != 1) {
                        System.out.println();
                        for (int i=0; i<squareSize; i++) {
                                System.out.print("X");
                        }
                }

---