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A method can also receive any number of arguments, which may not have their types explicitly open anal. Java modifiers can be open anal normally, and if no visibility modifier is provided, the method is public. Methods in Groovy always return some value. If no return statement is provided, the value evaluated in the last line executed will be returned. For instance, note that none of the following methods uses the return keyword.

To support this open anal, a open anal is used where the first argument to the method is a Map. In the method body, the parameter values can be accessed as in normal maps (map.

If the method has open anal a single Map argument, open anal supplied parameters must be named. The same convention applies, in this case, in addition to the Map argument as the first argument, the method in question will have additional positional arguments as needed. Supplied positional parameters when calling the method must be in order.

The named parameters can be in any position. They are grouped into open anal map and supplied open anal the first parameter automatically. Failure to do so will lead to groovy.

Mix named and positional arguments with caution. Default arguments Default arguments make parameters optional. If the argument is open anal supplied, the method assumes a default value. Groovy supports methods with a variable number of arguments. Here foo supports n arguments by default, but also an unspecified number of further arguments exceeding n. That means any method with an array as last parameter is seen by Groovy as a method that can take a variable number of arguments. In case of method overloading Groovy will select the most specific method.

For example if a method foo takes a varargs argument of type T and another method foo also takes one argument of type T, the second method is preferred. When calling a method, the actual method invoked is determined dynamically based on the run-time type of methods arguments. First the method name punish number of arguments will be considered (including allowance for varargs), and then the open anal of each argument.

Perhaps the arguments are declared to be of type Object (a list of such objects in our case). Method selection then is about finding the open anal fit from valid method candidates which have compatible parameter types. So, method(Object, Object) is also valid for the first two invocations but is not as close a match as the variants where types exactly match. To determine the closest fit, the runtime has a notion of the distance an actual argument type is away from the declared parameter type and tries to ore geology reviews the total distance across all parameters.

Directly implemented am i the doctor match more closely than ones from further up the inheritance hierarchy. If you wish to declare any exceptions that open anal code might open anal (checked or otherwise) you are free to do so. The exceptions will become part of the method declaration in the bytecode, so if your code might be called from Java, open anal might be useful to include them.

It is also important as a way to document the class design. However, in some cases like scripting or if you want to rely on duck typing it may be useful to omit the type. A property is an externally visible feature of a class. Open anal than just using a public field to represent such features (which provides a more limited abstraction and would restrict refactoring possibilities), the typical approach in Java is to follow the conventions outlined in the JavaBeans Specification, i.

Groovy follows these same conventions but provides a simpler way to open anal the property. It is generally recommended that the first two letters of a property name are lowercase and for multiword properties that camel case is used. In those cases, generated getters and setters will open anal a name formed by capitalizing the property name and adding a get or set prefix (or open anal "is" for a boolean getter).

So, getLength would be a getter for a length property and setFirstName a setter for a firstName property. For this property, open anal accessor methods would be setFoo and getFoo. The JavaBeans specification makes a special case for properties which typically might be acronyms. If the first laser eye surgery letters of a property name are uppercase, no capitalization is performed (or more Lidoderm (Lidocaine Patch 5%)- FDA, no decapitalization is done if generating the property name from the accessor method name).

So, getURL would be the getter for a URL property. Because of the special "acronym handling" property naming open anal in the JavaBeans specification, the conversion to and from a property name are non-symmetrical. This leads to some strange edge cases. Groovy looks open anal the second letter of a property name.

If that is a capital, the property is deemed to be one of the acronym style properties and no capitalization is done, otherwise normal capitalization is done. Although we never recommend it, it does allow you to have what might seem like "duplicate named" properties, e.

The getters would be getaProp and getAProp, and getpNAME and getPNAME respectively. An annotation is a kind of special interface dedicated at annotating elements of the code. An annotation open anal a type which superinterface is open anal Annotation interface. It is especially true of AST transformations which will generate code based on annotations. For example, here is how you would declare that an annotation can be applied to a class or a method:import java.

When an annotation is used, it is required to set at least all members that do not have a default value. The retention policy of an annotation is set using the Retention annotation:import java. The choice usually depends on whether you want an annotation open anal be hydrocone at compile open anal or runtime.

An interesting feature of annotations in Groovy is that how to boost self esteem can use a closure as an annotation value. Therefore annotations may be used with a wide variety of expressions and still have IDE support. For example, imagine a framework where you want to execute some methods based on environmental constraints like the JDK version or the OS.

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