For example:
\"I don\'t like these \"double\" quotes\"
and I want the output to be
I don\'t like these double quotes
Use String#replace().
To replace them with spaces (as per your question title):
System.out.println("I don't like these \"double\" quotes".replace("\"", " "));
The above can also be done with characters:
System.out.println("I don't like these \"double\" quotes".replace('"', ' '));
To remove them (as per your example):
System.out.println("I don't like these \"double\" quotes".replace("\"", ""));