public @interface Override {
}

@Retention(RetentionPolicy.SOURCE)
public @interface Override {
}

@Target(ElementType.METHOD)
public @interface Override {
}

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.SOURCE)
public @interface Override {
}

@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.ANNOTATION_TYPE)
public @interface Target {

    ElementType[] value();
}

public class SimpleCalculator {

    @Deprecated
    public int add(int x, int y) {
        return x+y;
    }
}

public class MultiplCalculator extends SimpleCalculator {
    // 重写SimpleCalculator中方法,但不使用@Deprecated
    public int add(int x, int y) {
        return  Math.abs(x)+Math.abs(y);
    }
}

//test code
public class Main {

    public static void main(String[] args) {
        new SimpleCalculator().add(3, 4);
        new MultiplCalculator().add(3,5);
    }
}

public class SimpleCalculator {
    /**
     * @param x
     * @param y
     * @return
     * 
     * @deprecated deprecated As of version 1.1,
     * replace by <code>SimpleCalculator.add(double x,double y)</code>
     */
    @Deprecated
    public int add(int x, int y) {
        return x+y;
    }

    public double add(double x,double y) {
        return x+y;
    }

}

public @interface 注解名 {定义体}

@Documented
@Target(ElementType.CONSTRUCTOR)
@Retention(RetentionPolicy.RUNTIME)
public @interface UserMeta {
    public int id() default 0;

    public String name() default "";

    public int age() default ;
}

public class User {
    private int id;
    private int age;
    private String name;

    @UserMeta(id=1,name="dong",age = 10)
    public User() {
    }


    public User(int id, int age, String name) {
        this.id = id;
        this.age = age;
        this.name = name;
    }

  //...省略setter和getter方法

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", age=" + age +
                ", name='" + name + '\'' +
                '}';
    }
}

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.CONSTRUCTOR)
public @interface UserMeta {
    public int id() default 0;

    public String name() default "";

    public int age() default 0;
}

public class AnnotationProcessor {

    public static void init(Object object) {

        if (!(object instanceof User)) {
            throw new IllegalArgumentException("[" + object.getClass().getSimpleName() + "] isn't type of User");
        }

        Constructor[] constructors = object.getClass().getDeclaredConstructors();
        for (Constructor constructor : constructors) {
            if (constructor.isAnnotationPresent(UserMeta.class)) {
                UserMeta userFill = (UserMeta) constructor.getAnnotation(UserMeta.class);
                int age = userFill.age();
                int id = userFill.id();
                String name = userFill.name();
                ((User) object).setAge(age);
                ((User) object).setId(id);
                ((User) object).setName(name);
            }
        }
    }
}

public class Main {

    public static void main(String[] args) {
        User user = new User();
        AnnotationProcessor.init(user);
        System.out.println(user.toString());
    }
}

//该注解用于配置layout资源
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface ContentView {
    int value();//只有一个返回时,可用value做名称,这样在使用的时候就不需要使用的名称进行标志
}

//该注解用于配置控件ID
@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
public @interface ViewInject {
    int id();
    boolean clickable() default  false;
}

public class ButterKnife {

    //view控件
    public static void initViews(Object object, View sourceView){
        //获取该类声明的成员变量
        Field[] fields = object.getClass().getDeclaredFields();
        for (Field field : fields){
            //获取该成员变量上使用的ViewInject注解
            ViewInject viewInject = field.getAnnotation(ViewInject.class);
            if(viewInject != null){
                int viewId = viewInject.id();//获取id参数值
                boolean clickable = viewInject.clickable();//获取clickable参数值
                if(viewId != -1){
                    try {
                        field.setAccessible(true);
                        field.set(object, sourceView.findViewById(viewId));
                        if(clickable == true){
                            sourceView.findViewById(viewId).setOnClickListener((View.OnClickListener) (object));
                        }
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }

    //布局资源
    public static void initLayout(Activity activity){
        Class<? extends Activity> activityClass =  activity.getClass();
        ContentView contentView = activityClass.getAnnotation(ContentView.class);
        if(contentView != null){
            int layoutId = contentView.value();
            try {
                //反射执行setContentView（）方法
                Method method = activityClass.getMethod("setContentView", int.class);
                method.invoke(activity, layoutId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }


    public static void init(Activity activity) {
        initLayout(activity);
        initViews(activity,activity.getWindow().getDecorView());
    }
}

@ContentView(id=R.layout.activity_main)
public class MainActivity extends Activity implements View.OnClickListener {

    @ViewInject(id=R.id.tvDis,clickable = true)
    private TextView tvDis;

    @ViewInject(id=R.id.btnNew,clickable =true)
    private Button btnNew;

    @ViewInject(id =R.id.btnScreenShot,clickable = true)
    private Button btnScreenShot;

    @ViewInject(id =R.id.imgContainer)
    private ImageView imgContainer;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        AnnotationUtil.inJect(this);

    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.tvDis:
                break;
            case R.id.btnNew:
                break;
            case R.id.btnScreenShot:
                break;
        }
    }
}

public class MyAnnotationProcessor extends AbstractProcessor {

    @Override
    public Set<String> getSupportedAnnotationTypes() {
        return super.getSupportedAnnotationTypes();
    }

    @Override
    public SourceVersion getSupportedSourceVersion() {
        return super.getSupportedSourceVersion();
    }

    @Override
    public synchronized void init(ProcessingEnvironment processingEnv) {
        super.init(processingEnv);
    }

    @Override
    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
        return false;
    }
}

public interface ProcessingEnvironment {

    Map<String,String> getOptions();

    //Messager用来报告错误，警告和其他提示信息
    Messager getMessager();

    //Filter用来创建新的源文件，class文件以及辅助文件
    Filer getFiler();

    //Elements中包含用于操作Element的工具方法
    Elements getElementUtils();

     //Types中包含用于操作TypeMirror的工具方法
    Types getTypeUtils();

    SourceVersion getSourceVersion();

    Locale getLocale();
}

package com.closedevice;             //PackageElement

public class Main{                  //TypeElement
    private int x;                  //VariableElement

    private Main(){                 //ExecuteableElement

    }

    private void print(String msg){ //其中的参数部分String msg为TypeElement

    }

}

public enum TypeKind {
    BOOLEAN,BYTE,SHORT,INT,LONG,CHAR,FLOAT,DOUBLE,VOID,NONE,NULL,ARRAY,DECLARED,ERROR,  TYPEVAR,WILDCARD,PACKAGE,EXECUTABLE,OTHER,UNION,INTERSECTION;

    public boolean isPrimitive() {
        switch(this) {
        case BOOLEAN:
        case BYTE:
        case SHORT:
        case INT:
        case LONG:
        case CHAR:
        case FLOAT:
        case DOUBLE:
            return true;

        default:
            return false;
        }
    }
}

public interface RoundEnvironment {

    boolean processingOver();

     //上一轮注解处理器是否产生错误
    boolean errorRaised();

     //返回上一轮注解处理器生成的根元素
    Set<? extends Element> getRootElements();

   //返回包含指定注解类型的元素的集合
    Set<? extends Element> getElementsAnnotatedWith(TypeElement a);

    //返回包含指定注解类型的元素的集合
    Set<? extends Element> getElementsAnnotatedWith(Class<? extends Annotation> a);
}

@Target({ElementType.TYPE, ElementType.FIELD, ElementType.METHOD})  
@Retention(RetentionPolicy.CLASS)                                  
public @interface Print {                                     
}

public class PrintProcessor extends AbstractProcessor {

    private Messager mMessager;

    @Override
    public synchronized void init(ProcessingEnvironment processingEnvironment) {
        super.init(processingEnvironment);
        mMessager = processingEnvironment.getMessager();
    }

    @Override
    public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
        for (TypeElement te : annotations) {
            for (Element e : roundEnv.getElementsAnnotatedWith(te)) {//find special annotationed element
                print(e.toString());//print element
            }
        }
        return true;
    }

    @Override
    public SourceVersion getSupportedSourceVersion() {

        return SourceVersion.latestSupported();
    }

    @Override
    public Set<String> getSupportedAnnotationTypes() {
        LinkedHashSet<String> annotations = new LinkedHashSet<>();
        annotations.add(Print.class.getCanonicalName());
        return super.getSupportedAnnotationTypes();
    }

    private void print(String msg) {
        mMessager.printMessage(Diagnostic.Kind.NOTE, msg);
    }
}

@Retention(CLASS)
@Target(METHOD)
public @interface Code {
    public String author();
    public String date() default "";
}

public class CodeProcessor extends AbstractProcessor {

    private final String SUFFIX = "$WrmRequestInfo";

    private Messager mMessager;
    private Filer mFiler;
    private Types mTypeUtils;

    @Override
    public synchronized void init(ProcessingEnvironment processingEnvironment) {
        super.init(processingEnvironment);
        mMessager = processingEnvironment.getMessager();
        mFiler = processingEnvironment.getFiler();
        mTypeUtils = processingEnvironment.getTypeUtils();

    }

    @Override
    public SourceVersion getSupportedSourceVersion() {
        return SourceVersion.latestSupported();
    }

    @Override
    public Set<String> getSupportedAnnotationTypes() {
        LinkedHashSet<String> annotations = new LinkedHashSet<>();
        annotations.add(Code.class.getCanonicalName());
        return annotations;
    }

    @Override
    public boolean process(Set<? extends TypeElement> set, RoundEnvironment roundEnvironment) {
        for (Element e : roundEnvironment.getElementsAnnotatedWith(Code.class)) {//find special annotationed element
            Code ca = e.getAnnotation(Code.class);
            TypeElement clazz = (TypeElement) e.getEnclosingElement();
            try {
                generateCode(e, ca, clazz);
            } catch (IOException x) {
                processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR,
                        x.toString());
                return false
            }
        }
        return true;
    }

    //generate 
    private void generateCode(Element e, Code ca, TypeElement clazz) throws IOException {
        JavaFileObject f = mFiler.createSourceFile(clazz.getQualifiedName() + SUFFIX);
        mMessager.printMessage(Diagnostic.Kind.NOTE, "Creating " + f.toUri());
        Writer w = f.openWriter();
        try {
            String pack = clazz.getQualifiedName().toString();
            PrintWriter pw = new PrintWriter(w);
            pw.println("package " + pack.substring(0, pack.lastIndexOf('.')) + ";"); //create package element
            pw.println("\n class " + clazz.getSimpleName() + "Autogenerate {");//create class element
            pw.println("\n    protected " + clazz.getSimpleName() + "Autogenerate() {}");//create class construction
            pw.println("    protected final void message() {");//create method
            pw.println("\n//" + e);
            pw.println("//" + ca);
            pw.println("\n        System.out.println(\"author:" + ca.author() + "\");");
            pw.println("\n        System.out.println(\"date:" + ca.date() + "\");");
            pw.println("    }");
            pw.println("}");
            pw.flush();
        } finally {
            w.close();
        }
    }

}

public class MainActivity extends AppCompatActivity {

    @Override
    @Print
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        process();
    }

    @Code(author = "closedevice",date="20161225")
    private void process() {

    }


}

package com.closedevice.annotationtest;

 class MainActivityAutogenerate {

    protected MainActivityAutogenerate() {}
    protected final void message() {

//process()
//@com.closedevice.annotation.Code(date=20161225, author=closedevice)

        System.out.println("author:closedevice");

        System.out.println("date:20161225");
    }
}