Java Enterprise in a Nutshell, Second Edition

Literals

String literals are indicated with single quotes. For example:

JMSType = 'updateAck'

If you need to use a single quote in a string literal, use two single quotes:

JMSCorrelationID = 'Joe''s message'

Numeric literals are either integer values or floating-point values. Integer values follow the rules for Java integer literals. They are all numerals, with no decimal point, and can have a value in the same range as a Java long value:

42, 149, -273

Floating-point literals follow the syntax of Java floating-point literals. They are numerals with a decimal point:

3.14, 98.6, -273.0

They are also in scientific notation:

31.4e-1, 6.022e23, 2.998e8

Literals can also be the boolean values true or false.