Edited:
Thank you all for your help. I was able to get it working using the the skills I learned in the previous chapters and your advice. Thank you so much!
You can enclose the code in a while loop as follows to achieve the task:
boolean validChoice=false;
while(!validChoice){
switch(choice){
case 1:
//logic
validChoice=true;
case 2:
//logic
validChoice=true;
case 3:
//logic
validChoice=true;
default:
//print "invalid choice" and ask to reenter
}