Transform IF statement into IF NOT statement (Java)

How to transform this IF statement to IF NOT statement?

The purpose of the code is to ignore lines starting with "//" and empty lines.

if (lineOfText.contains("//") || lineOfText.trim().length() == 0)
continue; 

FILE TO BE READ

// this is a comment, any lines that start with //
// (and blank lines) should be ignored


// data is title, itemCode, cost, timesBorrowed, onLoan
item 1, LM002411,3989,781,true
item 2, LM002711,599,0,FALSE
item 3, LM002876,4599,45,TRUE
item 4, LM002468,6395,0,TRUE
item 5, LM002153,4554,0,FALSE