偷看java.io.Console类并在给定控制台中手动打开或关闭回显的静态方法。

/*

 * Copyright (c) 2013 Jean Niklas L'orange. All rights reserved.

 *

 * The use and distribution terms for this software are covered by the

 * Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)

 * which can be found in the file LICENSE at the root of this distribution.

 *

 * By using this software in any fashion, you are agreeing to be bound by

 * the terms of this license.

 *

 * You must not remove this notice, or any other, from this software.

 */

//package com.nowjava;

import java.io.Console;/**来自 n o w j a v a . c o m - 时代Java**/


import java.lang.reflect.Field;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;


public class Main {

    public static void main(String[] argv) throws Exception {

        boolean on = true;

        System.out.println(setEcho(on));

    }
    /*
    来 自*
     时 代 J a v a - N o w J a v a . c o m
    */


    /**

     * A static method which peeks into the {@link java.io.Console} class and

     * manually turns on or off echoing in the given console.

     *

     * @param on whether to set echoing on or off.

     *

     * @exception NoSuchMethodException if Java's own console class have no

     * private method named "echo".

     * @exception NoSuchFieldException if Java's own console class have no

     * private field named "echoOff".

     * @exception InvocationTargetException if Java's own console class have a

     * private method named "echo", but that this method tries to invoke that

     * method erroneously.

     * @exception IllegalAccessException if the access restrictions prohibits

     * this method from modifying and using private methods in Java's own

     * console class.

     */

    public static synchronized boolean setEcho(boolean on)

            throws NoSuchMethodException, IllegalAccessException,

            NoSuchFieldException, InvocationTargetException {

        Class params[] = new Class[1];

        params[0] = Boolean.TYPE;

        Method echo =