public class Fruit{
    public void displayName(){
        System.out.println("水果的名字是：*****");
    }
}

class Orange extends Fruit{
    @Override
    public void displayName(){
        System.out.println("水果的名字是：桔子");
    }
}

class Peach extends Fruit{
    @Override
    public void displayname(){
        System.out.println("水果的名字是：桃子");
    }
}

public class AppleService {
    public void displayName(){
        System.out.println("水果的名字是：苹果");
    }

    /**
     * @deprecated 该方法已经过期，不推荐使用
     */
    @Deprecated
    public void showTaste(){
        System.out.println("水果的苹果的口感是：脆甜");
    }

    public void showTaste(int typeId){
        if(typeId==1){
            System.out.println("水果的苹果的口感是：酸涩");
        }
        else if(typeId==2){
            System.out.println("水果的苹果的口感是：绵甜");
        }
        else{
            System.out.println("水果的苹果的口感是：脆甜");
        }
    }
}

public class AppleConsumer {
    //@SuppressWarnings({"deprecation"})
    public static void main(String[] args) {
        AppleService appleService=new AppleService();
        appleService.showTaste();
        appleService.showTaste(2);
    }
}

public class SuppressWarningTest {
    @SuppressWarnings("unchecked")
    public void addItems2(String item){
        @SuppressWarnings("unused")
        List list = new ArrayList();
        List items = new ArrayList();
        items.add(item);
    }

    @SuppressWarnings({"unchecked","unused"})
    public void addItems1(String item){
        List list = new ArrayList();
        list.add(item);
    }

    @SuppressWarnings("all")
    public void addItems(String item){
        List list = new ArrayList();
        list.add(item);
    }
}

/**
 *自定义注解MyAnnotation
 */
@Target(ElementType.TYPE) //目标对象是类型
@Retention(RetentionPolicy.RUNTIME) //保存至运行时
@Documented //生成javadoc文档时，该注解内容一起生成文档
@Inherited //该注解被子类继承
public @interface MyAnnotation {
    public String value() default ""; //当只有一个元素时，建议元素名定义为value(),这样使用时赋值可以省略"value="
    String name() default "devin"; //String
    int age() default 18; //int
    boolean isStudent() default true; //boolean
    String[] alias(); //数组
    enum Color {GREEN, BLUE, RED,} //枚举类型
    Color favoriteColor() default Color.GREEN; //枚举值
}


@MyAnnotation(
        value = "info",
        name = "myname",
        age = 99,
        isStudent = false,
        alias = {"name1", "name2"},
        favoriteColor = MyAnnotation.Color.RED
)
public class MyClass {
    //使用MyAnnotation注解，该类生成的javadoc文档包含注解信息如下：
    /*
    @MyAnnotation(value = "info", name = "myname", age = 99, isStudent = false, alias = {"name1","name2"}, favoriteColor = Color.RED)
    public class MyClass
    extends Object
     */
}


public class MySubClass extends MyClass{
	//子类MySubClass继承了父类MyClass的注解
}

/***********注解声明***************/
/**
 * 水果名称注解
 */
@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface FruitName {
    String value() default " ";
}


/**
 * 水果颜色注解
 */
@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface FruitColor {
    /**
     * 颜色枚举
     */
    public enum Color{BLUE, RED, GREEN};

    /**
     * 颜色属性
     * @return
     */
    Color fruitColor() default Color.GREEN;
}


/**
 * 水果供应商注解
 */
@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface FruitProvider {
    /**
     * 供应商编号
     * @return
     */
    public int id() default -1;

    /**
     * 供应商名称
     * @return
     */
    public String name() default " ";

    /**
     * 供应商地址
     * @return
     */
    public String address() default " ";
}
/***********注解使用***************/
public class Apple {
    @FruitName("Apple")
    private String appleName;
    @FruitColor(fruitColor = FruitColor.Color.RED)
    private String appleColor;
    @FruitProvider(id = 1, name = "陕西红富士集团", address = "陕西红富士大厦")
    private String appleProvider;

    public String getAppleProvider() {
        return appleProvider;
    }

    public void setAppleProvider(String appleProvider) {
        this.appleProvider = appleProvider;
    }

    public String getAppleName() {
        return appleName;
    }

    public void setAppleName(String appleName) {
        this.appleName = appleName;
    }

    public String getAppleColor() {
        return appleColor;
    }

    public void setAppleColor(String appleColor) {
        this.appleColor = appleColor;
    }

    public void displayName(){
        System.out.println(getAppleName());
    }
}

/***********注解信息获取***************/
public class AnnotationParser {
    public static void main(String[] args) {
        Field[] fields = Apple.class.getDeclaredFields();
        for (Field field : fields) {
            //System.out.println(field.getName().toString());
            if (field.isAnnotationPresent(FruitName.class)){
                FruitName fruitName = field.getAnnotation(FruitName.class);
                System.out.println("水果的名称：" + fruitName.value());
            }else if (field.isAnnotationPresent(FruitColor.class)){
                FruitColor fruitColor = field.getAnnotation(FruitColor.class);
                System.out.println("水果的颜色："+fruitColor.fruitColor());
            }else if (field.isAnnotationPresent(FruitProvider.class)){
                FruitProvider fruitProvider = field.getAnnotation(FruitProvider.class);
                System.out.println("水果供应商编号:" + fruitProvider.id() + " 名称:" + fruitProvider.name() + " 地址:" + fruitProvider.address());
            }
        }
    }
}

/***********输出结果***************/
水果的名称：Apple
水果的颜色：RED
水果供应商编号:1 名称:陕西红富士集团 地址:陕西红富士大厦

@Target({ElementType.TYPE_PARAMETER, ElementType.TYPE_USE})
public @interface Encrypted {
}


public class MyTypeAnnotation {
    @Encrypted String data;
    List<@Encrypted String> strings;
}

public @interface Authority {
     String role();
}

public @interface Authorities {
    Authority[] value();
}

public class RepeatAnnotationUseOldVersion {    
    @Authorities({@Authority(role="Admin"),@Authority(role="Manager")})
    public void doSomeThing(){
    }
}

@Repeatable(Authorities.class)
public @interface Authority {
     String role();
}

public @interface Authorities {
    Authority[] value();
}

public class RepeatAnnotationUseNewVersion {
    @Authority(role="Admin")
    @Authority(role="Manager")
    public void doSomeThing(){ }
}