class or interface expected java что делать
ошибка java: class, interface, or enum expected
где метод «third» надо указать, и как?
Помощь в написании контрольных, курсовых и дипломных работ здесь.
Ошибка: «class interface or enum expected»
class interface or enum expected в java это в Dog.java компилируется. компилирую 1-ым(javac.
Ошибка reference to List is ambiguous; both interface java.util.List in package java.util and class java.awt.List in.
Почему кгда я загружаю пакеты awt, utill вместе в одной проге при обьявлении елемента List я ловлю.
Student Student, да ёмаё, код выложи ВЕСЬ!
Добавлено через 10 секунд
Прям как есть
Решение
Подскажите, пожалуйста, почему в консоли не выводится никакого сообщения, а просто пишется, что ошибок нет?
Потому что метод нужно вызвать
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Кстати, он у тебя написан неправильно
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Error: Expected class, delegate, enum, interface, or struct
Создал приложение winforms, добавил класс с реализацией методов, почему то куча ошибок типа.
Ошибка main.cs(17,11): error CS1525: Unexpected symbol `void’, expecting `class’, `delegate’, `enum’, `interface’,
Выскакивает ошибка main.cs(17,11): error CS1525: Unexpected symbol `void’, expecting `class’.
Ошибка «Runtime Error 430 class does not support Automation or expected Interface» под Win7
Привет всем) Написанный мною скрипт, работает всего лишь на Windows 8, а на Windows 7 при.
‘class’ or ‘interface’ expected в имени метода
Разрабатывая приложение на JavaFX, столкнулся с проблемой. Создал метод в контроллере, но при.
Class does not support Automation or does not support expected interface
в документе Ворд добавил Microsoft Forms 2.0 Frame стал на него вешать код, проверяю код, получаю.
How to fix «class, interface, or enum expected» error in Java? Example
Today, I am going to tell you about one such error, «class, interface, or enum expected». This is another compile-time error in Java that arises due to curly braces. Typically this error occurs when there is an additional curly brace at the end of the program.
If you compile this program using javac, you will get the following error:
Since this is a small program, you can easily spot the additional curly brace at the end of the problem but it’s very difficult in a big program with several classes and methods.
This becomes even tougher if you are not using any IDE like Eclipse or Netbeans which will give you a visible sign of where an error is. If you know how to use Eclipse or any other Java IDE, just copy-paste your code into IDE and it will tell you the exact location of the error which hint to solve.
Alternatively, if you are coding in Notepad, I assume you are a beginner, then try to correctly indent your code. n our example program above, notice that the two curly braces at the end of the program are at the same indentation level, which cannot happen in a valid program. Therefore, simply delete one of the curly braces for the code to compile, the error will go away as shown below:
So, next time you get the «class, interface, or enum expected» error, just check if you additional curly braces a the end of your program.
Java error: class, interface, or enum expected
I need to know the output of this code. But it’s not working. Maybe the code is wrong. I’m still learning how to use Java, and I tried fixing this for hours but still no luck.
Can anyone tell me what is wrong or missing in the code?
4 Answers 4
Put your main method in a class.
Another point here is, you can have only public class in a file, so your A B and C all class can’t be public in same java file.
Your java file name must be same as public class name. i.e. here DemoClass is public class so file name will be DemoClass.java
Java doc for getting started : getting started with java
Also note that this might not print what you would expect. It would actually print:
Why? Constructors are always chained to the super class.
You can, but it is not recommended, nest your classes in a file. It is perfectly valid.
Notice in the output below that each successive child calls its parent’s default constructor ( super() ) implicitly.
Warning: You shouldn’t have more than 1 public classes in 1 java file, not recommended. However, it could still work if you didn’t use the ‘public’ identifier (or by using static or inside another class). But for a starter, I would recommend you to have them all in separate files.
Error: Your main method does not belong to any class. I propose you create another class that includes the public static void main method to test your application.
Info: keep a look at inheritance as your printings might not be what you expect. (Constructor of class B calls the constructor of A, and constructor of class C calls the constructor B which in turn calls the constructor of A).
How to Fix “class, interface, or enum expected” Error in Java with Examples? – GeeksforGeeks
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public static void main(String[] args)
In this case, the error can be removed by simply removing the extra bracket.
Due to method outside class body
This error you will generally get when you have accidentally put your method outside class body.
Let’s see with the help of simple example.
public class MyClass <
public static void main ( String args [ ] ) <
public static void myMethod ( )
You will get below error when you run javac command.
$javac MyClass.java
MyClass.java:7: error: class, interface, or enum expected
public static void myMethod()
^
MyClass.java:10: error: class, interface, or enum expected
>
^
2 errors
But if you use eclipse ide, you will get below error.
Syntax error on token “>”, delete this token
As you can see, eclipse provides you much better information regarding this error.
I have given a very simple example, you might get this error in complex code. It is hard to identify issues with that so I will recommend you to use some ide like eclipse.
PROBLEM:
“Class, Interface, Or enum Expected” error arises due to additional curly braces at end of Java program.
Considering an example where the file is named as wikitechy.java
public class wiki < public static void main(String[] args) < System.out.println(“Wikitechy welcomes you!”); >> > 1 error found: File: wikitechy.java [line: 6] Error: class, interface, or enum expected
SOLUTION 1
We need to notice that two curly braces at the end of the program are at the same indentation level, which cannot happen in a valid program. So, if you get this same Class, interface or enum expected error next time, first check if there is an additional curly braces at end of program.
SOLUTION 2
Simply delete one of the curly braces for the code to compile properly and check the code below :
SOLUTION 3
We can also identify this kind of error by pressing CTRL-A (to highlight the entire program) and then TAB (to correctly indent the highlighted code)
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6 ответов
Вы пропустите объявление класса.
ответ дан azendh 27 August 2018 в 04:15
Посмотрите на определение функции. Если вы забыли использовать «()» после объявления функции где-нибудь, вы получите много ошибок в том же формате:
А также вы забыли закрытие скобки после завершения определения вашего класса или функции. Но обратите внимание, что эти недостающие скобки не являются единственной причиной такого типа ошибок.
ответ дан Erfankam 27 August 2018 в 04:15
Вы забыли свое объявление класса:
public class MyClass <…
ответ дан NullPoiиteя 27 August 2018 в 04:15
класс, интерфейс или enum expected
Вышеприведенная ошибка даже возможна, если инструкция импорта пропущена. Правильное утверждение – «import com.company.HelloWorld;»
Если по ошибке при написании и редактировании кода это не написано как «t com.company.HelloWorld;»
компилятор покажет «класс, интерфейс или ожидаемое перечисление»
ответ дан Prakhyat 27 August 2018 в 04:15
Каждый метод должен находиться внутри класса. Ваш метод derivativeQuiz находится за пределами класса.
public class ClassName < ///your methods>
ответ дан Suraj Chandran 27 August 2018 в 04:15
основной класс должен быть объявлен в вашем классе следующим образом:
ответ дан Uwe Allner 27 August 2018 в 04:15
I am getting a strange runtime error from my code:
How can this happen? How can an interface get instantiated?
Update: (In response to some answers) I am compiling and running against the same set of libraries, but I am using Guice to inject a Provider for this particular Interface.
The problem went away when I bound an implementation to the interface (seems like the @ImplementedBy annotation was not enough).
I was more interested in the mechanics through which Guice managed to actually instantiate an interface.
5 Answers 5
This happens when your runtime classpath is different than your compile time classpath.
When your application was compiled, a class (named SomeInterface in your question) existed as a class.
When your application is running at compile time, SomeInterface exists as an interface (instead of a class.)
This causes an IncompatibleClassChangeError to be thrown at runtime.
This is a common occurence if you had a different version of a jar file on the compile time classpath than on the runtime classpath.
Most likely the code was compiled against a class in a library, which was then changed to an interface in the version you run against.
I had the same problem. I use two jar libraries in my application. One library is built upon the other.
The library A defines top classes and interfaces. Library B requires library A.
This is pseudocode of some code used in library B:
Apparently library A is newer than library B and TheInterface doesn’t contain someMethod anymore, but TheClass still does. The only way to fix this is to get the source for either jar and change these things by hand (if at all possible).
So at compile time, it was referring to the old version and at runtime it was referring to the new version.
I removed the version specified in my local pom.xml and it worked.
Of course, the 3rd party had broken backward-compatibility between their versions and changed a class to an interface or vice-versa. But they are free to do so.