jdk 1.8 InvocationHandler 中文注释

JDK动态代理实现了接口InvocationHandler重写了invoke类
动态代理的底层是通过反射技术来实现

先翻译这一点,知道这是干啥的了。下面的解释以后有机会再翻译

/*
 * Copyright (c) 1999, 2006, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
package java.lang.reflect;
/**
 * {@code InvocationHandler} 由代理实例 invocation handler 实现的接口.
 * invocation handler:调用处理程序
 *
 * <p>每个代理实例都有一个关联的 invocation handler.
 * 当一个方法被一个代理实例调用时, 将对该方法调用进行编码,
 * 并将其调度到invocation handler的 {@code invoke}方法.
 * 
 * @author      Peter Jones
 * @translator  oc
 * @see         Proxy
 * @since       1.3
 */
public interface InvocationHandler {
    /**
     * 处理代理实例上的方法调用并返回结果。
     * 在与之关联的代理实例上调用方法时,将在调用处理程序上调用该方法。
     *
     * @param   proxy 被调用方法上的代理实例
     *
     * @param   method the {@code Method} instance corresponding to
     * the interface method invoked on the proxy instance.  The declaring
     * class of the {@code Method} object will be the interface that
     * the method was declared in, which may be a superinterface of the
     * proxy interface that the proxy class inherits the method through.
     *
     * @param   args an array of objects containing the values of the
     * arguments passed in the method invocation on the proxy instance,
     * or {@code null} if interface method takes no arguments.
     * Arguments of primitive types are wrapped in instances of the
     * appropriate primitive wrapper class, such as
     * {@code java.lang.Integer} or {@code java.lang.Boolean}.
     *
     * @return  the value to return from the method invocation on the
     * proxy instance.  If the declared return type of the interface
     * method is a primitive type, then the value returned by
     * this method must be an instance of the corresponding primitive
     * wrapper class; otherwise, it must be a type assignable to the
     * declared return type.  If the value returned by this method is
     * {@code null} and the interface method's return type is
     * primitive, then a {@code NullPointerException} will be
     * thrown by the method invocation on the proxy instance.  If the
     * value returned by this method is otherwise not compatible with
     * the interface method's declared return type as described above,
     * a {@code ClassCastException} will be thrown by the method
     * invocation on the proxy instance.
     *
     * @throws  Throwable the exception to throw from the method
     * invocation on the proxy instance.  The exception's type must be
     * assignable either to any of the exception types declared in the
     * {@code throws} clause of the interface method or to the
     * unchecked exception types {@code java.lang.RuntimeException}
     * or {@code java.lang.Error}.  If a checked exception is
     * thrown by this method that is not assignable to any of the
     * exception types declared in the {@code throws} clause of
     * the interface method, then an
     * {@link UndeclaredThrowableException} containing the
     * exception that was thrown by this method will be thrown by the
     * method invocation on the proxy instance.
     *
     * @see     UndeclaredThrowableException
     */
    public Object invoke(Object proxy, Method method, Object[] args)
        throws Throwable;
}
posted @ 2020-04-24 11:14  ZC_Wang  阅读(226)  评论(0编辑  收藏  举报