题目内容
Reader类和Writer类都是字符流类的顶层父类，是两个抽象类。( )
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编写一个程序，将d:\java目录下的所有.java文件复制到d:\jad目录下，并将原来文件的扩展名从.java改为.jad。public class Test3 {private static FileFilter fileFilter = new FileFilter() {@Overridepublic boolean accept(File arg0) {// TODO Auto-generated method stubString tmp = arg0.getName().toLowerCase();return true;}return false;}};public static void main(String[] args) throws Exception {// TODO Auto-generated method stubFile file = new File("D:/java");InputStream in = null;OutputStream out = null;String fileName = null;String destName = null;File f = new File("D:/jad");for (File file2 : files) {in = new FileInputStream(file2);if(!f.exists()){}fileName = file2.getName();destName = (String) fileName.subSequence(0, fileName.lastIndexOf("."));int len = 0;byte[] b = new byte[1024];while((len = in.read(b))!= -1){out.write(b, 0, len);}}}}
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Java实现将九九乘法表输入到文本文件package com.test;import java.io.File;import java.io.FileNotFoundException;import java.io.PrintStream;public class Test1 {public static void main(String[] args) {PrintStream ps = null;try {//("D:/九九乘法表.txt")for(int i=1;i<=9;i++){for(int j=1;j<=i;j++){System.out.print(j+"*"+i+"="+i*j+"\t");}}} catch (FileNotFoundException e) {e.printStackTrace();}finally{ps.close();}}}
面试前的准备工作包括( )。
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