This tutorial will cover how to fetch JSON from assets folder and parse it. We will use GSON, a JSON parsing library developed by Google, to quickly parse the JSON into Java objects with very minimal work required.
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dependencies { compile 'com.google.code.gson:gson:2.8.0' // Latest as of April 2017 } |
In my this tutorial, I am going to demonstrate how to extract method details with Annotation details with Reflection mechanism. Have a look on complete details and let me know if I you need some more details. Below interface is @Retention.RUNTIME Annotation enabled.
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package www.technicaljungle.com; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; @Retention(RetentionPolicy.RUNTIME) public @interface RefRetentionInterface { String value(); } |
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Meta data is some kind of description that you can supply along with your data. In java it’s possible to do with annotations, XML, there are other methods. In order to take advantage of meta data you should have something that will process this data and decide ……………
The ‘@documented’ annotation indicates that an annotation with this type should be documented by the javadoc tool. By default, annotations are not included in javadoc. But if @Documented is used, it then will be processed by javadoc-like tools and the annotation type information will also be included ……………
The retention annotation indicates where and how long annotations with this type are to be retained. There are three values: SOURCE—Annotations with this type will be by retained only at the source level and will be ignored by the compiler. CLASS—Annotations with this type will be by ……………
Meta Annotation which is also called as Annotation of Annotation. This is of four types: Target Retention Documented Inherited The Target Annotation The target annotation indicates the targeted elements of a class in which the annotation type will be applicable. It contains the following enumerated types as ……………
There are two types of annotations available with JDK5: Simple annotations: These are the basic types supplied with Tiger, which you can use to annotate your code only; you cannot use those to create a custom annotation type. Meta annotations: These are the annotation types designed for annotating annotation-type ……………
Rules of Thumb for Defining Java Annotation Types Here are some rules-of-thumb when defining an annotation type: Annotation declaration should start with an ‘at’ sign like @, following with an interface keyword, following with the annotation name. Method declarations should not have any parameters. Method declarations should ……………