将 Boolean 序列化为“1”和“0”而不是“真”和“假”

Question

I can't find any method on the Boolean class to serialize a Boolean to "1" and "0" instead of "true" and "false".

Is there any native function to do that? If not, what is the best way (most optimized way)?

Update: I indeed mean to produce a String out of a Boolean .

Answer 1

If you're talking about producing a String from a given Boolean , then no, there is no built-in method that produces "0" or "1", but you can easily write it:

public static String toNumeralString(final Boolean input) {
  if (input == null) {
    return "null";
  } else {
    return input.booleanValue() ? "1" : "0";
  }
}

Depending on your use case, it might be more appropriate to let it throw a NullPointerException if input is null. If that's the case for you, then you can reduce the method to the second return line alone.

Answer 2

You can use CompareTo :

public static Integer booleanToInteger(Boolean bool)
{
    if(bool == null) return null;
    else return bool.compareTo(Boolean.FALSE);
}

Answer 3

If you want to serialise to a char you can do

public static char toChar(final Boolean b) {
    return b == null ? '?' : b ? '1' : '0';
}

Answer 4

I am not sure but just throwing it out. you can use your own Decorator class.

Answer 5

Use Thrift API:

TSerializer serializer = new TSerializer(new TSimpleJSONProtocol.Factory());
String json = serializer.toString(object);

It will boolean to 0 or 1 instead of true/false.