randomcasefilter.java

来自「本书透彻讲解了经典的《设计模式：可复用面向对象软件的基础》一书涵盖的23种基本设」· Java 代码 · 共 47 行

package com.oozinoz.io;

import java.io.*;

/*
 * Copyright (c) 2001 Steven J. Metsker.
 * 
 * Steve Metsker makes no representations or warranties about
 * the fitness of this software for any particular purpose, 
 * including the implied warranty of merchantability.
 *
 * Please use this software as you wish with the sole
 * restriction that you may not claim that you wrote it.
 */
/**
 * Make characters upper case or lower case at random.
 * 
 * @author Steven J. Metsker
 */
public class RandomCaseFilter extends OozinozFilter 
{
/**
 * Construct a filter that pass randomly-cased characters
 * to the supplied stream.
 *
 * @param out a writer to which to pass down writes 
 */
public RandomCaseFilter(Writer out)
{
	super(out);
}
/**
 * Pass a randomly-cased version of the supplied character
 * to the underlying stream.
 *
 * @param c the character to write
 *
 * @throws IOException if an I/O error occurs
 */
public void write(int c) throws IOException 
{
	out.write(
		Math.random() > .5
			? Character.toLowerCase((char) c)
			: Character.toUpperCase((char) c));
}
}