$/*1.$ When should you use a for loop as opposed to a while loop? Type your answer as a comment.$*//*$

$2.$ Write a Java code snippet to validate user input. Prompt the user to enter a value between $10$ and $100,$ inclusive. Execute the loop until the user enters valid input. Then print the valid value to the console. $*//*$

$3.$ Write a Java code snippet with a nested for loop to print $6$ rows of $8$ random integers between $15$ and $300$ inclusive. Make sure that your columns are aligned, and that your rows are labeled. Example output of first two rows: Row $1$: $15251161106029944300$ Row $2$: $169959842132628917*//*$

$4.$ Prompt the user to enter a sequence of positive integer inputs. Use a while loop with $-1$ as the sentinel$.$ a$.$ Determine the smallest number. b$.$ Determine the largest number. c$.$ Then output the smallest and the largest numbers with the appropriate text. For example: The largest number is YY and the smallest number is ZZ$.*/$