Java Reference
In-Depth Information
1.10. String Objects
A
String
class type deals specifically with sequences of character data
and provides language-level support for initializing them. The
String
class
provides a variety of methods to operate on
String
objects.
You've already seen string literals in examples like the
HelloWorld
pro-
gram. When you write a statement such as
System.out.println("Hello, world");
the compiler actually creates a
String
object initialized to the value of the
specified string literal and passes that
String
object as the argument to
the
println
method.
You don't need to specify the length of a
String
object when you create it.
You can create a new
String
object and initialize it all in one statement,
as shown in this example:
class StringsDemo {
public static void main(String[] args) {
String myName = "Petronius";
myName = myName + " Arbiter";
System.out.println("Name = " + myName);
}
}
Here we declare a
String
variable called
myName
and initialize it with an ob-
ject reference to a string literal. Following initialization, we use the
String
concatenation operator (
+
) to make a new
String
object with new con-
tents and store a reference to this new string object into the variable.
Finally, we print the value of
myName
on the standard output stream. The
output when you run this program is
