Java Reference
In-Depth Information
float
double
There are also
append
and
insert
methods that take part of a
CharSequence
or
char
array as an argument. Here is some code that uses various
append
invocations to create a
StringBuilder
that describes the square root of
an integer:
String sqrtInt(int i) {
StringBuilder buf = new StringBuilder();
buf.append("sqrt(").append(i).append(')');
buf.append(" = ").append(Math.sqrt(i));
return buf.toString();
}
The
append
and
insert
methods return the
StringBuilder
object itself, en-
abling you to append to the result of a previous append.
A few
append
methods together form the
java.lang.Appendable
interface.
These methods are
public Appendable
append(char c)
public Appendable
append(CharSequence seq)
public Appendable
append(CharSequence seq, int start, int
end)
The
Appendable
interface is used to mark classes that can receive format-
