Write java code... (use while loop to validate input, and for loop to display square made of Xs )

20. Square Display Write a program that asks the user for a positive integer no greater than 15. The program should then display a square on the screen using the character 'X'. The number entered by the user will be the length of each side of the square. For example, if the user enters 5, the program should display the following: XxXXX XxxXX If the user enters 8, the program should display the following: xxxxXxxXX XXxXXxXX xxXxXxXX