conditional statements - Take NOT of Condition in Java String

Question

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Answer 1

If you have many expressions or long expressions, you could parse them as text by putting them in a text file, then scanning through it using Scanner. By the way, this is a fascinating question, glad you asked!

File expressions = new File(/*pathname*/);
File inverse = new File(/*pathname*/);
FileWriter fileWriter = new fileWriter(inverse);
Scanner scanner = new Scanner(expressions);

while(scanner.hasNext()){
    String str = "";
    String next = scanner.next();
    if (next.equals("=="){
        str = "!=";
    }
    else if (next.equals("!="){
        str = "==";
    }
    else if (next.equals("||"){
        str = "&&";
    }
    else if (next.equals("&&"){
        str = "||";
    }
fileWriter.write(str)
}

This almost surely works, maybe the suggestion Tim made is better. Like Tim said, your goal will likely be accomplished through some sort of parsing.