Primitive Data Types

You can place underscores only between digits; you cannot place underscores in the following places:

At the beginning or end of a number Adjacent to a decimal point in a floating point literal Prior to an F or L suffix In positions where a string of digits is expected

Fields that are declared but not initialized will be set to a reasonable default by the compiler.

Generally speaking, this default will be zero or null, depending on the data type. Data Type Default Value (for fields) byte 0 short 0 int long 0 Lfloat 0.0 fdouble 0.0 dchar '\u0000' String (or any object) null boolean false

The Java programming language also supports a few special escape sequences for char and String literals: _________________.

\b (backspace), \t (tab), \n (line feed), \f (form feed), \r (carriage return), \" (double quote), \' (single quote), and \\ (backslash) "Unicode escape" such as '\u0108'

The ________ data type has only two possible values: true and false.

boolean

It's possible to assign a literal to a variable of a primitive type:

boolean result = true; char capitalC = 'C'; byte b = 100; short s = 10000; int i = 100000;

The _____ data type is an 8-bit signed two's complement integer. It has a minimum value of -128 and a maximum value of 127 (inclusive).

byte

Values of the integral types _______________________________ can be created from int literals.

byte, short, int, and long

The ______ data type is a single 16-bit Unicode character.

char

The ________ data type is a double-precision 64-bit IEEE 754 floating point.

double

The _______ data type is a single-precision 32-bit IEEE 754 floating point.

float

A __________________ literal is of type float if it ends with the letter F or f; otherwise its type is double and it can optionally end with the letter D or d.

floating-point

the ___ data type is a 32-bit signed two's complement integer, which has a minimum value of -231 and a maximum value of 231-1.

int

The Java programming language also provides special support for character strings via the _______________ class. Enclosing your character string within double quotes will automatically create a new String object String objects are _____________, which means that once created, their values cannot be changed. The String class is not technically a primitive data type, but considering the special support given to it by the language, you'll probably tend to think of it as such.

java.lang.String, immutable

An integer __________ is of type long if it ends with the letter L or l; otherwise it is of type int.

literal

The _____ data type is a 64-bit two's complement integer. The signed long has a minimum value of -263 and a maximum value of 263-1.

long

Local variables are slightly different; the compiler ______ assigns a default value to an uninitialized local variable. If you cannot initialize your local variable where it is declared, make sure to assign it a value before you attempt to use it. Accessing an uninitialized local variable will result in a compile-time error.

never

The _____ keyword isn't used when initializing a variable of a primitive type.

new

Primitive types are special data types built into the language; they are ___________________

not objects created from a class

The ______ data type is a 16-bit signed two's complement integer. It has a minimum value of -32,768 and a maximum value of 32,767 (inclusive).

short

any number of ___________________ can appear anywhere between digits in a numerical literal.

underscore characters (_)