Java Reference
In-Depth Information
Characters in strings can be specified with the octal digit syntax, but
all three octal digits should be used to prevent accidents when an octal
value is specified next to a valid octal digit in the string. For example,
the string "\0116" is equivalent to "\t6" , whereas the string "\116" is
equivalent to "N" .
7.2.7. Class Literals
Every type (primitive or reference) has an associated instance of class
Class that represents that type. These instances are often referred to as
the class object for a given type. You can name the class object for a
type directly by following the type name with ".class" , as in
String.class
java.lang.String.class
java.util.Iterator.class
boolean.class
The first two of these class literals refer to the same instance of class
Class because String and java.lang.String are two different names for
the same type. The third class literal is a reference to the Class instance
for the Iterator interface mentioned on page 129 . The last is the Class
instance that represents the primitive type boolean .
Since class Class is generic, the actual type of the class literal for a ref-
erence type T is Class<T> , while for primitive types it is Class<W> where
W is the wrapper class for that primitive type. But note, for example,
that boolean.class and Boolean.class are two different objects of type
Class<Boolean> . Generic types are discussed in Chapter 11 , and the class
Class is discussed in Chapter 16 .
Exercise 7.2 : Write a class that declares a field for each of the primitive
numeric types, and try to assign values using the different literal forms-
for example, try to assign 3.5f to an int field. Which literals can be used
 
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