/*
 * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */
package java.lang;
import java.lang.annotation.*;
/**
 * Indicates that a method declaration is intended to override a
 * method declaration in a supertype. If a method is annotated with
 * this annotation type compilers are required to generate an error
 * message unless at least one of the following conditions hold:
 *
 * <ul><li>
 * The method does override or implement a method declared in a
 * supertype.
 * </li><li>
 * The method has a signature that is override-equivalent to that of
 * any public method declared in {@linkplain Object}.
 * </li></ul>
 *
 * @author  Peter von der Ah&eacute;
 * @author  Joshua Bloch
 * @jls 8.4.8 Inheritance, Overriding, and Hiding
 * @jls 9.4.1 Inheritance and Overriding
 * @jls 9.6.4.4 @Override
 * @since 1.5
 */
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.SOURCE)
public @interface Override {
}

package java.lang;
import java.lang.annotation.*;
import static java.lang.annotation.ElementType.*;
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(value={CONSTRUCTOR, FIELD, LOCAL_VARIABLE, METHOD, PACKAGE, MODULE, PARAMETER, TYPE})
public @interface Deprecated {
    String since() default "";
    boolean forRemoval() default false;
}

package advanced.Annotation;
/**
 * @author : Cyan_RA9
 * @version : 5.0
 */
public class Deprecated_ {
    @Deprecated
    public void f() {
        System.out.println("这方法没啥屁用，不建议使用。你非要用当我没说。。。");
    }
}
class Test {
    public static void main(String[] args) {
        Deprecated_ deprecated_ = new Deprecated_();
        deprecated_.f();
    }
}

@SuppressWarnings("explanation1", "explanation2", "explanation3", ......)
//双引号中的说明信息不同，达到的抑制警告效果便不同。

package advanced.Annotation;
import java.util.ArrayList;
import java.util.List;
/**
 * @author : Cyan_RA9
 * @version : 5.0
 */
    @SuppressWarnings({})
public class SuppressWarnings_ {
    public static void main(String[] args) {
        List list = new ArrayList();
        list.add("");
        list.add(1);
        list.add(1);
        int i;
        System.out.println(list.get(2));
    }
}

package java.lang;
import java.lang.annotation.*;
import static java.lang.annotation.ElementType.*;
@Target({TYPE, FIELD, METHOD, PARAMETER, CONSTRUCTOR, LOCAL_VARIABLE, MODULE})
@Retention(RetentionPolicy.SOURCE)
public @interface SuppressWarnings {
    String[] value();
}

package java.lang;
import java.lang.annotation.*;
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.SOURCE)
public @interface Override {
}

package java.lang.annotation;
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.ANNOTATION_TYPE)
public @interface Target {
    ElementType[] value();
}

package java.lang.annotation;
public enum ElementType {
    /** Class, interface (including annotation interface), enum, or record
     * declaration */
    TYPE,
    /** Field declaration (includes enum constants) */
    FIELD,
    /** Method declaration */
    METHOD,
    /** Formal parameter declaration */
    PARAMETER,
    /** Constructor declaration */
    CONSTRUCTOR,
    /** Local variable declaration */
    LOCAL_VARIABLE,
    /** Annotation interface declaration (Formerly known as an annotation type.) */
    ANNOTATION_TYPE,
    /** Package declaration */
    PACKAGE,
    /**
     * Type parameter declaration
     *
     * @since 1.8
     */
    TYPE_PARAMETER,
    /**
     * Use of a type
     *
     * @since 1.8
     */
    TYPE_USE,
    /**
     * Module declaration.
     *
     * @since 9
     */
    MODULE,
    /**
     * Record component
     *
     * @jls 8.10.3 Record Members
     * @jls 9.7.4 Where Annotations May Appear
     *
     * @since 16
     */
    RECORD_COMPONENT;
}

package advanced.Annotation;
import java.lang.annotation.*;
/**
 * @author : Cyan_RA9
 * @version : 2.0
 */
@Documented
@Retention(RetentionPolicy.SOURCE)
@Target(ElementType.METHOD)
public @interface Demo {
    //自定义一个注解类。
}

package advanced.Annotation.test;
import advanced.Annotation.Demo;
/**
 * @author : Cyan_RA9
 * @version : 1.0
 */
class Test_EX {
    @Demo
    public void greet() {
        System.out.println("Hello!");
    }
    @Demo
    public void eat() {
        System.out.println("美汁儿美汁儿~");
    }
}