True and False.

False will be the default value of the boolean datatype in java

in Unix: the datatype is "Date"

in C++: the datatype is "char"

in Unix: the datatype is "Date"

in C++: the datatype is "char"

While there are obvious data types like primitives (boolean, char, byte, short, int, long, float, double) and arrays, really any class which stores some form of information can be considered a data type. Objects like String, BigInteger, and the whole Collections framework also belong in this category.