我正在试图找出如何读取文件,然后计算某个字符串出现的次数。
这就是我的文件,它是一个.txt:
Test
Test
Test
Test
我希望该方法返回它在文件中的次数。关于如何做到这一点的任何想法?我主要需要第一部分的帮助。因此,如果我在搜索字符串“Test”,我希望它返回4。
先谢谢了!希望我提供足够的信息!
答案 0 :(得分:0)
将此方法添加到您的类中,将FileInputStream传递给它,它应该返回文件中的单词数。请记住,这是区分大小写的。
public int countWord(String word, FileInputStream fis) {
BufferedReader in = new BufferedReader(new InputStreamReader(fis));
String readLine = "";
int count = 0;
while((readLine = in.readLine()) != null) {
String words = readLine.split(" ");
for(String s : words) {
if(s.equals(word)) count++;
}
return count;
}
现在只是写了,而且没有经过测试,所以让我知道它是否有效。另外,如果这是一个家庭作业问题,请确保你理解我做了什么。
答案 1 :(得分:0)
你在这里:
public int countStringInFile(String stringToLookFor, String fileName){
int count = 0;
try{
FileInputStream fstream = new FileInputStream(fileName);
DataInputStream in = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String strLine;
while ((strLine = br.readLine()) != null) {
int startIndex = strLine.indexOf(stringToLookFor);
while (startIndex != -1) {
count++;
startIndex = base.indexOf(stringToLookFor,
startIndex +stringToLookFor.length());
}
}
in.close();
}catch (Exception e){//Catch exception if any
System.err.println("Error: " + e.getMessage());
}
return count;
}
用法:int count = countStringInFile("SomeWordToLookFor", "FileName");
答案 2 :(得分:0)
如果您已将每个文件中的读取内容转换为字符串,我建议您查看String方法拆分。
给它字符串代码'Test',它将返回一个string类型的数组 - 计算每行的元素数。总结它们以获得总发生率。
import java.io.*;
public class StringCount {
public static void main(String args[]) throws Exception{
String testString = "Test";
String filePath = "Test.txt";
String strLine;
int numRead=0;
try {
FileInputStream fstream = new FileInputStream(filePath);
DataInputStream in = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
while ((strLine = br.readLine()) != null) {
strLine = strLine + " ";
String [] strArry = strLine.split(testString);
if (strArry.length > 1) {
numRead = numRead + strArry.length - 1;
}
else {
if (strLine == testString) {
numRead++;
}
}
}
in.close();
System.out.println(testString + " was found " + numRead + " times.");
}catch (Exception e){
}
}
}
答案 3 :(得分:0)
我会这样做:
public static void main(String[] args) throws IOException {
BufferedReader in = new BufferedReader(new FileReader("Test.txt"));
Scanner sc = new Scanner(System.in);
System.out.print("Enter the subtring to look for: ");
String word = sc.next();
String line = in.readLine();
int count = 0;
do {
count += (line.length() - line.replace(word, "").length()) / word.length();
line = in.readLine();
} while (line != null);
System.out.print("There are " + count + " occurrences of " + word + " in ");
}