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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This is a bit of a complex annotation type. It indicates that the annotated class with this type is automatically inherited. More specifically, if you define an annotation with the @Inherited tag, then annotate a class with your annotation, and finally extend the class in a subclass, ……………
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 ……………
Interface and its usage Interface is a 100% abstract class. It means its method should not have its body part. Signatures below: User version
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interface InterfaceDemo { int onSuccess(); int onFail(); } |
Some key points for above demo: 1) Keyword “interface” used here for declaring it. 2) No method body. No curly braces like {…}. ……………