do While loop trouble

Question

I am having trouble with my do-while statement. I created a do-while loop to ensure the only accepted input is "e" or "o" (not case sensitive), however, it continues the loop even though I inserted the desired input. Any help is appreciated!

Current Code & Result

Answer 1

This statement:
while(!side.equalsIgnoreCase("O") || !side.equalsIgnoreCase("E"));
is always true

If you input E or e, this !side.equalsIgnoreCase("E") is false but this !side.equalsIgnoreCase("O") is true

If you input O or o, this !side.equalsIgnoreCase("O") is false but this !side.equalsIgnoreCase("E") is true

Since you are using ||, true || false gives you true so the loop never ends

For every other input, both are true (true || true) which is also true

You need to replace it with:
while(!side.equalsIgnoreCase("O") && !side.equalsIgnoreCase("E"));