Java annotations string array

Java Custom annotation with array element

I would like to validate the userInput version from the property file to the available Beans supported versions. Not sure, how can i get the value, iterate and compare with userInoutVersion. The value could be 8 or <6,7>as an int array. Not sure, how can i iterate the value to check if any of the value is matching with the input version. final List apiVersions = attributes.get(«value»).stream().collect(Collectors.toList()); Question: How to iterate attributes.get(«value») and compare with userInputVersion? attributes.get(«value») returns a List of Object. I tried the below code,

final List apiVersions = attributes.get("value").stream().collect(Collectors.toList()); boolean result = apiVersions.stream().anyMatch(version -> (int)version == Integer.parseInt(userInputVersion)); 

«This is not working if i pass inputversion as 5.0» — define «not working». «The above results in class cast exception « — edit your question and include the COMPLETE stack trace (format as code , please, not blockquote) and indicate which line in your source throws the exception.

The input version can’t be a double since it’s expecting an int[] . If you want to be flexible you’d want to pass a String[] . You’re also not getting a List back, you’re getting an array back.

1 Answer 1

You have defined a good custom annotation which uses Spring’s @Conditional and this process will only create beans if the property named ‘property‘ is present in the array value.

The annotation defines these two variables as follows:

1. value: int[] (One or more supported versions)
2. property: String (The name of the property to compare to)

When you use the metadata to retrieve these values, Spring returns them as Objects. Casting these objects into the types you defined them as is a key step. There is no need for streams as iterating an int[] array is trivial.

I tested various forms of your annotation (value = 5, value = , etc) and found the following code to work well (@Conditional beans were only created if the version was correct).

public class OnApiVersionConditional implements Condition < @Override public boolean matches(final ConditionContext context, final AnnotatedTypeMetadata metadata) < final MultiValueMapattributes = metadata .getAllAnnotationAttributes(ConditionalOnApiVersion.class.getName()); // 1. Retrieve the property name from the annotation (i.e. userInputVersion) List propertyObject = attributes.get("property"); // 2. Cast it to a String String propertyName = (String)propertyObject.get(0); // 3. Retrieve the value List list = attributes.get("value"); // 4. Cast it to int[] int[] values = (int[])list.get(0); // 5. Look up the actual version (based on the property name in the annotation) final String inputVersion = context.getEnvironment().getProperty(propertyName); // Assume it is an integer? int version = Integer.valueOf(inputVersion).intValue(); // 6. Scan the supported version; look to match against actual version for (int i : values) if (i == version) return true; // The version is not supported return false; > > 

This method could be improved by validating both property and value; returning false if either of these contains bad/empty values, etc.

Источник

How To Set String Array In Java Annotation

and if found sets the field to the value present in the annotation., you’d have to implement a special annotation processor class that is called by the java compiler when, compiling .java files that contain annotations you’re interested in., So collect operation returns a Set> but i am looking, : Set teacherId = batches.stream(

Java annotation to set a variable java

The java lang spec defines when the value assigned to a field is considered ‘compile time constant’ and, String z = «HELLO!»., you have to analyse it with Java reflection, direct after setting the attribute or before setting it, with another logic. https://www.baeldung.com/java-custom-annotation (You can write private, attr. in reflection temporary: Set private field value with reflection)

Java set variable via annotation in Java

java variables in annotations import org.junit.Test; import, strong> Do it like this: public @interface CustomAnnot < String, [] author() default "me"; String description() default ""; >And your annotation, = null)

Java Annotations — how to create an array?

Java autowired annotation set field value

Convert Set of String to Array of String in Java

Set in Java: Set union = Sets.union(a, b); System.out.printf(«Union, Given a Set of Strings, the task is to convert the Set into an Array of Strings in Java., Create an empty Array of String of size as that of the Set of String., Convert the Set of String to Array of String using Set.toArray() method by passing, Convert the Set of String to Array of String using System.arraycopy() method.

How annotation works in Java?

Java Annotations

Introduction to Java Annotations Annotations were, What are Annotations in Java?, Built-in Java Annotations In Java, there are in-built annotations such as, What are Annotations in Java?, Built-in Java Annotations In Java, there are in-built annotations such as

Annotations in Java

The container is specified as an annotation whose value field is an array of the repeatable, , class name, or array of primitive, enum, string, or class name type., Annotations are only metadata set on the class that is used to reflect the metadata library., , stores an annotation array in it, then tries to instantiate, that stores array.

How and where are annotations used in java

There are also additional annotations to do with setting up testing (like @Before, In this tutorial, we will learn what annotations are, different Java annotations and how, ArrayList<>(); This is because we haven’t defined the generic type of the array, detail in the Java Annotation Types tutorial., and arrays of these types, and the default value cannot be null

Java — @Before and @test annotation

Question: I am very new to Java programming., It has annotations of @Before and @Test ., Annotations Often, testing frameworks provide annotations for various purposes, for example, The second argument is an array of parameters., Then, we showed how to use reflection to test a private method in Java.

Java spring value annotation on string code example

Just call a Java method: @Value(«foo») // or some EL expression which evaluates to, code> Edit/Update: I suppose there is another way to add filters using Java, Here you can set the order using setOrder method., () intercepts annotated methods, not annotated fields., For that, native AspectJ has get() and set()

Set dynamic serializedname annotation in android java

(«bucket») val bucket: String, @SerializedName(«location») val uploadLocation: String )

Java autowired annotation set field value code example

How to set scope in using annotation

Or you can try to define bean using annotation . for that you can use @Bean annotation., with @Component or the other bean annotations like @Service, etc., But this does not make spring process the other annotations configuration., process the annotations in the configured beans irrespective of whether they are defined via annotations

How to give type annotation for empty set?

Need type annotation for ‘set1’ How do I give type annotation, set1: Set[] = set() e.g. for set of strings: set1:, I’m not sure what is requiring a type annotation, but that annotation, empty sets.

Java java contains string with set

Set set1 Set set2 : That may, As kennytm said in a comment, if we use your example, and you have the «java» string in your list, looking, Using Only Java 8 If you don’t want to use Guava and only vanilla Java, («,+»)) .map(Arrays::stream) .collect(toSet()); Using Java < 8, String.split[] or StringTokenizer to extract an array, and finally add the array entries into a Set.

Java: Converting a set to an array for String representation

.*; public class Blagh < public static void main(String[] args) < Setset =, String[] array = set.toArray(new String[0]); System.out.println(set); System.out.println, set to array conversion., set to array., Java Set

Java string validation using enum values and annotation

How to deserialize a JSON string using @JsonCreator annotation in Java?

@JsonSetter annotation cannot be used., values (unique identifiers for type information) that are passed from our UI back to the Java, jackson-modules-java8 version 2.9.1 dependency invoking the java, > parameter names in compiled code in java 8 helps in this case., So I set up my ObjectMapper to use my

Java setting up an array java

I know that it wants me to set up an array as a parameter to the method but I don’t know, up an array as a parameter to the method but I don’t know exactly how to set it up., in java, I can’t set it right., Movimiento (Movement) private double monto; private int tipo; private String, You can’t set the indices of the array with that. How to correct it?

Java set length of an array java

Solution 1: The one and only way is to set, p> You seem to misunderstand the meaning of the abstract modifier in Java, Solution 1:According to the Java Language, Solution 2: You can’t set an array, to a size larger than Integer.MAX_VALUE , the java specs has the following

Java how to make a set of strings

static final String[] SET_VALUES = new String[] < "a", "b" >; public static final Set, introduced in Java 9 as evident from the statement set -> (Set)Set.of(set.toArray, Using Java 8 (Modifiable Sets) Using Stream in Java 8., (HashSet::new)); // stream from an array (String[] stringArray) Set strSet2 = Arrays.stream, («Java»); strings.add(«is»); strings.add(«very»); strings.add(«cool»); String message = String.join

Java: How to set an array with another array?

So, I have an array: String[] names = ; String[] newNames, Java programmers will generally search the javadoc in the web, or maybe in the IDE., > int[] a = ; int[] b = ; How would you set array a to, set it to the other?, Solution 3: Because arrays in Java

Java value annotation in java code example

The Javadoc tools of Oracle’s Java 8 and Java 9 Development Kit report the same error: , Another way with Spring Security is to intercept the URL pattern by setting this inside, However it requires a bit of setting up if you want more than the standard behaviour., In Java, annotations are used to attach meta-data to a program element such as a class,, CLASS is the default retention policy in Java.

Java use of annotation in java code example

Oracle has a good explanation of the concept and its meaning in Java on their site., Solution 2: Also, are they unique to Java, One typical Java example, @Override has no effect on the code but it can, I don’t know any examples in Java but in .NET this is used by the compiler to generate (de)serialization, /EDIT: Attributes on classes are comparable to tag interfaces (like Serializable in Java

Java how to use annotation on variable java

Actually in java there is no way to protect items in an array, some issues with slight differences in how arrays are represented as annotation parameters compared, to Java variables?, EDIT: I’ve just tried this with a String array, and didn’t run into the problem you mentioned, Now let us go through different types of java annotations present that are listed as follows

Java how to ignore any annotation in java

Annotations are a very important part of Java in modern technologies, Most of the technologies, In Java, built-in General Annotations are – @Override @Deprecated, FIELD, METHOD, PARAMETER, CONSTRUCTOR, LOCAL_VARIABLE >) public @interface SuppressWarnings < String, [] value; >As we can see, the above signature has only one element, which is Array, of String, with multiple possible values.

Java what is marker annotation in java

Java Meta-Annotations in Java Custom/User-defined Annotations in, what the difference is between the java annotations and java comments., span> = 25 ; String, static void main ( String, Java annotations can be either standard, customized, or meta-annotations.

Set up an array of strings in c

These pointers will then be set to the addresses of the static strings «blah»

Источник

How to use array of String as input parameters in a request for a Java application by using Spring annotations

Hello friend, today I am going to show you how to user a String[] array as an input parameter of a request. This is useful when you want to receive a series of values and then use them for any purpose.

So, let’s get started. Imagine you are creating a controller to read all pages of a CMS given the parent page, but these pages have states as integer values, so you would like to have a method that receives a list of integers (states) and then make a query to the database to get all pages that have the states in the input array.

1) In your controller class you will need to create a method -I would recommend to use Spring annotations-.

@RequestMapping( value = "/pages/get-by-parent/", // The is a PathVariable method = RequestMethod.GET, // This request is only valid when the request was done by GET method produces=MediaType.APPLICATION_JSON_VALUE) // Result will be returned in JSON public ResponseEntity> getWikiPagesList( @PathVariable("parentUuid") String parentUuid, // This matches with the path variable @RequestParam(value="includeStates[]", defaultValue="1,2,3") String[] includeStates // List of states to include )< // Do something here! >

Please, pay attention to the line, because that is the one that contains an array of String as input.

@RequestParam(value="includeStates[]", defaultValue="1,2,3") String[] includeStates // List of states to include

In this case, I am setting some default values: “1,2,3” in order to return pages with states 1, 2 or 3 in case the parameter includeStates[] is not present in the request. Of course, you can personalize this method to receive any other parameters.

I hope you find this tip useful for your development.

See you next time and remember, be happy with your code!

Источник