Convert string y/n/null to Boolean true/false/null in Java

Question

I am getting data from database in string format which is either 'y', 'n' or null(empty). I need to convert this value to Boolean 'y' to true, 'n' to false and null to null.

string 'y' -> true (Boolean)
string 'n' -> false (Boolean)
string null -> null (Boolean)

I tried bunch of methods but seems like null is always converting to false.

I have tried following methods

"Y".equalsIgnoreCase(str)
 BooleanUtils.toBooleanObject(str)

Any help would be appreciated. Thanks in Advance

Answer 1

Just make sure to use Boolean (capital B).

String foo = "y";
Boolean b = foo == null ? null : "y".equals(foo);

This will set b to null (if foo is null ), or to true (if foo == "y" ) or false in all other cases.

If you want it as a function:

private Boolean getBooleanFromDB( String value ) {
    Boolean result = value == null ? null : "y".equals(value);
    return result;
}