英文:
How to calculate the amount of letters written in a txt file
问题
我想知道是否有一种简单的方法来计算 txt 文件中的字母数。
假设我有不同的 txt 文件，其中写有不同数量的字母，我想要删除所有字母数超过 2000 的 txt 文件。
此外，让我们假设我一次只处理一个 txt 文件。我到目前为止尝试过这样做：
FileReader reader2 = new FileReader("C:\\Users\\Internet\\eclipse-workspace\\test2.txt");
BufferedReader buff = new BufferedReader(reader2)){
int counter = 0;
while(buff.ready()){
String aa = buff.readLine();
counter = counter + aa.length();
}
System.out.println(counter);
}
catch(Exception e) {
e.printStackTrace();
}
是否有一种更简单或性能更好的方法？
将所有字母都读入字符串，然后再将它们丢弃似乎浪费了很多时间。
我是否应该使用 InputStream 并使用 available() 方法，然后再进行分割？另一方面，我注意到 available() 方法会计算所有内容，就像我在 txt 文件中按 Enter 键会将字母数增加 2 一样。
感谢所有的回答。
英文:
i'd like to know whether there is an easy way to count the letters in a txt file.
Lets say i have different txt files with a different amount of letters written in it, and i want to delete all txt files which have more letters than lets say 2000.
Furthermore let's assume i deal with one txt at a time. I've tried this so far:
FileReader reader2 = new FileReader("C:\\Users\\Internet\\eclipse-workspace\\test2.txt");
BufferedReader buff = new BufferedReader(reader2)){
int counter = 0;
while(buff.ready()){
String aa = buff.readLine();
counter = counter + aa.length();
}
System.out.println(counter);
}
catch(Exception e) {
e.printStackTrace();
}
Is there an easier way or one which has better performance?
Reading all letters in a String to just discard them afterwards seems like a lot of timewaste.
Should i maybe use an InputStream and use available() and then divide? On the other hand i saw that available() counts literally everything like when i press Enter in the txt file it adds +2 to the amount of letters.
Thanks for all answers.
答案1
得分: 1
你可以像下面这样使用Files.lines：
counter = Files.lines(Paths.get("C:\\Users\\Internet\\eclipse-workspace\\test2.txt"))
.mapToInt(String::length)
.sum();
英文:
You can use Files.lines as below,
counter = Files.lines(Paths.get("C:\\Users\\Internet\\eclipse-workspace\\test2.txt"))
.mapToInt(String::length)
.sum();
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