将文件中的所有文本转换为大写字符

/** 时代Java公众号 - N o w J a  v a . c o m 提 供 **/

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.nio.file.FileSystems;

import java.nio.file.Files;

import java.nio.file.Path;


public class Main {

  public static void main(String[] arguments) {

    String sourceName = "a.txt";

    try {/*from NowJava.com*/

      Path source = FileSystems.getDefault().getPath(sourceName);

      Path temp = FileSystems.getDefault().getPath("tmp_" + sourceName);


      // Create input stream

      FileReader fr = new FileReader(source.toFile());

      BufferedReader in = new BufferedReader(fr);


      // Create output stream

      FileWriter fw = new FileWriter(temp.toFile());

      BufferedWriter out = new BufferedWriter(fw);


      boolean eof = false;

      int inChar;

      do {

        inChar = in.read();

        if (inChar != -1) {

          char outChar = Character.toUpperCase((char) inChar);

          out.write(outChar);

        } else

          eof = true;