By: Abinaya Emailed: 1729 times Printed: 2341 times
There are a number of features in Java that have no equivalent
in C++. Perhaps the three most important are multithreading, packages, and
interfaces, but there are several others that enrich the Java programming environment as well.
- Multithreading allows two or more pieces
of the same program to
execute concurrently. Further, this approach to concurrence is
supported at the
language level. There is no parallel for this in C++. If you
need to multithread a C++
program, you will need to do so manually, using operating system
both methods allow for concurrent execution of two or more
threads, Java's approach
is cleaner and easier to use.
- There is no feature in C++ that directly corresponds to a Java
package. The closest
similarity is a set of library functions that use a common
header file. However,
constructing and using a library in C++ is completely different
from constructing and
using a package in Java.
- The Java interface is somewhat similar to a C++ abstract class.
(An abstract class in
C++ is a class that contains at least one pure virtual
function.) For example, it is
impossible to create an instance of a C++ abstract class or a
Java interface. Both are
used to specify a consistent interface that subclasses will
implement. The main
difference is that an interface more cleanly represents this
- Java has a streamlined approach to memory allocation. Like C++,
it supports the new
keyword. However, it does not have delete. Instead, when the
last reference to an
object is destroyed, the object, itself, is automatically
deleted the next time that
garbage collection occurs.
- Java "removes" the C++ standard library, replacing it
with its own set of API classes.
While there is substantial functional similarity, there are
significant differences in the
names and parameters. Also, since all of the Java API library is
only a portion of the C++ library is, there will be differences
in the way library routines
- The break and continue statements have been enhanced in Java
to accept labels as
- The char type in Java declares 16-bit-wide Unicode
characters. This makes them
similar to C++'s wchar_t type. The use of Unicode helps ensure
- Java adds the >>> operator, which performs an
unsigned right shift.
- In addition to supporting single-line and multiline
comments, Java adds a third
comment form: the documentation comment. Documentation comments
begin with a
/** and end with a */.
- Java contains a built-in string type called String. String is
somewhat similar to the
standard string class type provided by C++. Of course, in C++
string is only available if
you include its class declarations in your program. It is not a
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