java字符串数组基础入门.docx

1 复制文本文件CopyFileDemo.javapackage cn.itcast_01;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;/* * 复制文本文件 * * 分析： * 复制数据，如果我们知道用记事本打开并能够读懂，就用字符流，否则用字节流。 * 通过该原理，我们知道我们应该采用字符流更方便一些。 * 而字符流有5种方式，所以做这个题目我们有5种方式。推荐掌握第5种。 * 数据源： * c:\\a.txt -- FileReader -- BufferdReader * 目的地： * d:\\b.txt -- FileWriter -- BufferedWriter */public class CopyFileDemo {public static void main(String[] args) throws IOException {String srcString = c:\\a.txt;String destString = d:\\b.txt;// method1(srcString, destString);// method2(srcString, destString);// method3(srcString, destString);// method4(srcString, destString);method5(srcString, destString);}// 字符缓冲流一次读写一个字符串private static void method5(String srcString, String destString)throws IOException {BufferedReader br = new BufferedReader(new FileReader(srcString));BufferedWriter bw = new BufferedWriter(new FileWriter(destString));String line = null;while ((line = br.readLine()) != null) {bw.write(line);bw.newLine();bw.flush();}bw.close();br.close();}// 字符缓冲流一次读写一个字符数组private static void method4(String srcString, String destString)throws IOException {BufferedReader br = new BufferedReader(new FileReader(srcString));BufferedWriter bw = new BufferedWriter(new FileWriter(destString));char[] chs = new char[1024];int len = 0;while ((len = br.read(chs)) != -1) {bw.write(chs, 0, len);}bw.close();br.close();}// 字符缓冲流一次读写一个字符private static void method3(String srcString, String destString)throws IOException {BufferedReader br = new BufferedReader(new FileReader(srcString));BufferedWriter bw = new BufferedWriter(new FileWriter(destString));int ch = 0;while ((ch = br.read()) != -1) {bw.write(ch);}bw.close();br.close();}// 基本字符流一次读写一个字符数组private static void method2(String srcString, String destString)throws IOException {FileReader fr = new FileReader(srcString);FileWriter fw = new FileWriter(destString);char[] chs = new char[1024];int len = 0;while ((len = fr.read(