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This Page compares Java and C++ for the benefit of persons having familiarity with C++ and making the transition to Java.

Revised: Sun Mar 27 11:30:53 CDT 2016

Table of contents

Preface

This module, which presents some of the similarities and differences between Java and C++, is provided solely for the benefit of those students who are already familiar with C++ and are making the transitionfrom C++ into Java.

If you have some familiarity with C++, you may find the material in this module helpful. If not, simply skip this module and move on to the nextmodule in the collection.

In general, students in Prof. Baldwin's Java/OOP courses are not expected to have any specific knowledge of C++.

This module is intended to be general in nature. Therefore, although a few update notes were added prior to publication at cnx.org, no significant effort hasbeen made to keep it up to date relative to any particular version of the Java JDK or any particular version of C++. Changes have occurred in both Java andC++ since the first publication of this document in 1997. Those changes may not be reflected in this module.

Similarities and differences

This list of similarities and differences is based heavily on The Java Language Environment, A White Paper by James Gosling and Henry McGilton and Thinking in Java by Bruce Eckel, which was freely available on the web when this document was first published.

Java does not support typedefs , defines , or a preprocessor . Without a preprocessor, there are no provisions for including header files.

Since Java does not have a preprocessor there is no concept of #define macros or manifest constants . However, the declaration of named constants is supported in Java through use of the final keyword.

Java does not support enums but, as mentioned above, does support named constants . (Note: the enum type was introduced into Java sometime between the first publication of this documentand Java version 7.)

Java supports classes , but does not support structures or unions .

All stand-alone C++ programs require a function named main and can have numerous other functions, including both stand-alone functions and functions that are members of a class. There are no stand-alone functions in Java. Instead, there are only functions that are members of a class, usually called methods.However, a Java application (not a Java applet) does require a class definition containing a main method.

Global functions and global data are not allowed in Java. However, variables that are declared static are shared among all objects instantiated from the class in which the static variables are declared. (Generally, static has a somewhat different meaning in C++ and Java. For example, the concept of a static local variable does not exist in Java as itdoes in C++.)

All classes in Java ultimately inherit from the class named Object . This is significantly different from C++ where it is possible to create inheritance trees that are completely unrelated to one another. All Java objects contain the eleven methods that are inherited from the Object class.

Questions & Answers

A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
Aislinn Reply
cm
tijani
what is titration
John Reply
what is physics
Siyaka Reply
A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance
Jude Reply
Can you compute that for me. Ty
Jude
what is the dimension formula of energy?
David Reply
what is viscosity?
David
what is inorganic
emma Reply
what is chemistry
Youesf Reply
what is inorganic
emma
Chemistry is a branch of science that deals with the study of matter,it composition,it structure and the changes it undergoes
Adjei
please, I'm a physics student and I need help in physics
Adjanou
chemistry could also be understood like the sexual attraction/repulsion of the male and female elements. the reaction varies depending on the energy differences of each given gender. + masculine -female.
Pedro
A ball is thrown straight up.it passes a 2.0m high window 7.50 m off the ground on it path up and takes 1.30 s to go past the window.what was the ball initial velocity
Krampah Reply
2. A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (0.20) at constant velocity by a force directed 25° above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
Sahid Reply
you have been hired as an espert witness in a court case involving an automobile accident. the accident involved car A of mass 1500kg which crashed into stationary car B of mass 1100kg. the driver of car A applied his brakes 15 m before he skidded and crashed into car B. after the collision, car A s
Samuel Reply
can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
Joseph Reply
Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
Joseph
"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
Ryan
what's motion
Maurice Reply
what are the types of wave
Maurice
answer
Magreth
progressive wave
Magreth
hello friend how are you
Muhammad Reply
fine, how about you?
Mohammed
hi
Mujahid
A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?
yasuo Reply
Who can show me the full solution in this problem?
Reofrir Reply
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Source:  OpenStax, Object-oriented programming (oop) with java. OpenStax CNX. Jun 29, 2016 Download for free at https://legacy.cnx.org/content/col11441/1.201
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