用户需求：
英语的26 个字母的频率在一本小说中是如何分布的？
某类型文章中常出现的单词是什么？
某作家最常用的词汇是什么？
参考他人代码如下：
package longword;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
public class Main {
public static int findwordlong(String text){
String[] array = {".",",","?","!"};
for (int i1 = 0; i1 < array.length; i1++) {
text = text.replace(array[i1]," ");
}
String[] textArray = text.split(" ");
return textArray.length;
}
public static String[] findword(String text){
String[] array = {".",",","?","!","“","”"," "};
for (int i1 = 0; i1 < array.length; i1++) {
text = text.replace(array[i1]," ");
}
String[] textArray = text.split(" ");
return textArray;
}
public static String readtxt(String txt) throws IOException
{
File file = new File(txt);//定义一个file对象，用来初始化FileReader
FileReader reader = null;
try {
reader = new FileReader(file);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}//定义一个fileReader对象，用来初始化BufferedReader
BufferedReader bReader = new BufferedReader(reader);//new一个BufferedReader对象，将文件内容读取到缓存
StringBuilder sb = new StringBuilder();//定义一个字符串缓存，将字符串存放缓存中
String s = "";
while ((s =bReader.readLine()) != null) {//逐行读取文件内容，不读取换行符和末尾的空格
sb.append(s);//将读取的字符串添加换行符后累加p存放在缓存中
}
bReader.close();
String str = sb.toString();
return str;
}
public static void appendMethodB(String fileName, String content) {
try {
//打开一个写文件器，构造函数中的第二个参数true表示以追加形式写文件,如果为 true，则将字节写入文件末尾处，而不是写入文件开始处
FileWriter writer = new FileWriter(fileName, true);
writer.write(content);
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
public static boolean judeFileExists(String txt) throws IOException {
File file = new File(txt);
if (!file.exists()) {
System.out.println("文件不存在！");
return false;
}
else if(file.length() == 0)
{
System.out.println("文件为空！");
return false;
}
String str=readtxt("input.txt");
if(findwordlong(str)==1)
{
System.out.println("文件只有一个单词！");
return false;
}
else
{
return true;
}
}
public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
if(judeFileExists("input.txt"))
{
String str=readtxt("input.txt");
int i;
int l= findwordlong(str);
String []word=new String[l];
char []first=new char[l];
char []tail=new char[l];
word=findword(str);
for(i=0;i<l;i++)
{
if(word[i].length()!=0)
{
first[i]=word[i].charAt(0);
tail[i]=word[i].charAt(word[i].length()-1);
System.out.println(word[i]);
}
}
String stemp=word[0];
appendMethodB("output.txt", word[0]);
for(i=1;i<l;i++)
{
if(first[i]==stemp.charAt(stemp.length()-1))
{
stemp=stemp+"-"+word[i];
appendMethodB("output.txt", "-"+word[i]);
}
}
if(stemp.equals(word[0]))
{
System.out.println("没有首尾相接的单词！");
}
else{
System.out.println(stemp);
}
}
}
}