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What is a serialVersionUID and why should I use it? Void doesn't return anything; it tells the compiler the method doesn't have a return value. The above code does not work without void. Understanding Classes and Objects in Java, Difference between Abstract Class and Interface in Java, Split() String method in Java with examples, Object Oriented Programming (OOPs) Concept in Java, Using predefined class name as Class or Variable name in Java, Java.util.TimeZone Class (Set-2) | Example On TimeZone Class, Implement Pair Class with Unit Class in Java using JavaTuples, Implement Triplet Class with Pair Class in Java using JavaTuples, Implement Quintet Class with Quartet Class in Java using JavaTuples, Implement Quartet Class with Triplet Class in Java using JavaTuples, Implement Octet Class from Septet Class in Java using JavaTuples, Implement Ennead Class from Octet Class in Java using JavaTuples, Implement Sextet Class from Quintet Class in Java using JavaTuples, Implement Septet Class from Sextet Class in Java using JavaTuples, Implement Decade Class from Ennead Class in Java using JavaTuples, Difference between Abstract Class and Concrete Class in Java. Mark 9:13 Elijah has come. When the return type is void, your method doesn't return anything. Attention reader! void means it returns nothing. I would have preferred they used "empty" (which sounds awkward, but wouldn't if we'd've been using it for 20 or 30 years. When to use LinkedList over ArrayList in Java? What other effects would this produce? How do I generate random integers within a specific range in Java? Posting to the forum is only allowed for members with active accounts. The reason the code will not work without void is because the System.out.println(String string) method returns nothing and just prints the supplied arguments to the standard out terminal, which is the computer monitor in most cases. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. Does a finally block always get executed in Java? void tell's to the VM that that specific method will not return anything. Yes, you have to specify void to specify that the method doesn't return anything.

Looking for movie with telekinetic lockpicking. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Can we Overload or Override static methods in java ? This is why we declared our function as a void -- it passes nothing back to it's caller once it's finished running. The void keyword in Java denotes that a method does not have a return type. It's printing strings to the console, but that's not the same thing as returning one from the method.

Execution of program start from main and when it encounters statment displayLine() control passes to method and after execution of the code of method control comes back to next statement of main method. The return type—the data type of the value returned by the method, or void if the method does not return a value.

Void can also be used as a pointer for unknown types, but that's a bit advanced. The reason the code will not work without void is because the System.out.println(String string) method returns nothing and just prints the supplied arguments to the standard out terminal, which is the computer monitor in most cases. See your article appearing on the GeeksforGeeks main page and help other Geeks. Void basically means "no type", "no value" or "empty". Don’t stop learning now. The main class get's the value and stores it in new_number which is then printed out to the user. You mean the tellItLikeItIs method? Here, in the following example we're considering a void method methodRankPoints. Please sign in or sign up to post. Does JVM create object of Main class (the class with main())?

When a method returns "nothing" you have to specify that by putting the void keyword in its signature. ), How is it different when you say, a method returns nothing but it prints something on Console, Improve database performance with connection pooling, Responding to the Lavender Letter and commitments moving forward, What should be the name for the new [*vcf*] tag related to bioinformatics vcf…, I cannot understand the purpose of using and not using “void”,(what does returning a value mean?". Why do you need to use a flare nut wrench instead of the open part of a combination spanner? You can see the documentation of the System.out.println here: http://download.oracle.com/javase/6/docs/api/java/io/PrintStream.html#println%28java.lang.String%29, To press the issue further, println is a classic example of a method which is performing computation as a "side effect.". If you have worked with functions before, this might help you understand better: In our main class we make a string with the value "Hello world!" instead of void, and use the return keyword inside the method: The function takes the argument and prints it out and returns nothing back to the main class because there is nothing that functions calculated or created -- it just printed a message to the user.

So whenever you create a function or method in java, you need to tell java the type that is being returned (int, String, etc). If nothing is returned, then you need to tell this by using void where applicable. The void keyword allows us to create methods which do not return a value.

http://download.oracle.com/javase/tutorial/java/javaOO/methods.html, http://download.oracle.com/javase/tutorial/java/javaOO/enum.html. and then call the function print_func with that message as the argument. Inner Class And Anonymous Inner Class that Implements Runnable | Concurrent Programming Approach 3, Java.util.BitSet class methods in Java with Examples | Set 2, Java.io.BufferedInputStream class in Java, Java.lang.Character.UnicodeBlock Class in Java, Different ways for Integer to String Conversions In Java. Is Java “pass-by-reference” or “pass-by-value”? Stack Overflow for Teams is a private, secure spot for you and Look again at your code: There's no return in that method. All parameters to a method are declared inside a prior of parenthesis. It is a uninstantiable placeholder. Tip: If you want a method to return a value, you can use a primitive data type (such as int, char, etc.) Why Java is not a purely Object-Oriented Language? How to emit only one hair particle from each vertex? How to know which constraint in Or.Tools CP-SAT caused Infeasibility. How do I convert a String to an int in Java? Void is the Java keyword that tells the compiler that a function will not be returning any value after it is executed. How do I read / convert an InputStream into a String in Java? This method is a void method, which does not return any value. rev 2020.10.16.37830, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. Return is the Java keyword that tells the compiler what will be returned when a function is finished.
What did I miss out? The void Keyword. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above. Once the function has completed this calculation, our main class needs to know what was calculated, so the function needs to return this value back to it's caller. Void is most commonly used in functions and methods. All methods have to have a return type specified, even if it's void. It does not return a string, you write a string to System.out but you're not returning one. They picked void because it goes hand and hand with "null".

You must specify what a method returns, even if you're just saying that it returns nothing. Java.lang.Void class is a placeholder which holds a reference to a class object if it represents void keyword. Citing a published book that does not appear on MathSciNet. And it does return a string? If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. All methods in Java must be one return type. What is the grandchild of a parents's siblings called? can any one explain me why use void and when please explain in brief, Void is used when there is no return, for example, You could make a constructor like, public String onColorSwitch(String color) { return color; }. Methods of lang.void class are all inherited from Object class in Java: This article is contributed by Mohit Gupta. It certainly doesn't return a string - look, there are no return statements anywhere. Get hold of all the important Java and Collections concepts with the Fundamentals of Java and Java Collections Course at a student-friendly price and become industry ready. methodRankPoints(255.7);. Java.lang.Void class is a placeholder which holds a reference to a class object if it represents void keyword. Please use ide.geeksforgeeks.org, generate link and share the link here. 我艦隊於黄海清艦撃沈之圖 how do you say this in Japanese? Would the solid material inside an airship displace air and be counted towards lift? By using our site, you 5.2 void Method In this program, we have defined a method displayLine that displays a line. Difference between == and .equals() method in Java, Write Interview

It is a uninstantiable placeholder. Tea bags to find the leak on the International Space Station? What is the difference between public, protected, package-private and private in Java? You print to the console and exit. What does the progressive tense 「〜ていて」 of the 「〜ている」 form mean? Is U between NG and a vowel always a consonant? Call to a void method must be a statement i.e.

If nothing is returned, then you need to tell this by using void where applicable. What is this turbine engine panel that opens on landing? Writing code in comment? It's not really clear why you think it is returning a string. Is it okay to use "It was all just a virtual world / dream" for a plot twist?

but if you aren't going to return anything, then you could use. Well, uninstantiable means that this class have a private constructor and no other constructor that we can access from outside. When a method returns "nothing" you have to specify that by putting the void keyword in its signature.. You can see the documentation of the System.out.println here: Static methods vs Instance methods in Java, Assigning values to static final variables in Java, Instance Initialization Block (IIB) in Java. Could an infinite number of photons fit in finite space? Here String args[ ] declares a parameter named args which contains an array of objects of the class type string. Please write to us at contribute@geeksforgeeks.org to report any issue with the above content. Technically speaking they could have designed the language such that if you don't write a return type then it's assumed to return nothing, however making you explicitly write out void helps to ensure that the lack of a returned value is intentional and not accidental. What did Jesus mean? Why is there a void in there?

How would randomly interacting humans change the battle strategies of 2 inch tall figures? How to add an element to an Array in Java? In Java, Can we call the main() method of a class from another class? For instance, you make two functions, square() and calcSquare(), which both calculate the square of a number.

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