Java:计算文本文件/字符串中的空行 [英] Java: Count empty lines in a text file/string
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问题描述
我使用下面的代码来计算Java中的空行,但是这个代码返回的空行数比它大。
int countEmptyLines(String s){
int result = 0;
模式regex = Pattern.compile((?m)^ \\s * $);
Matcher testMatcher = regex.matcher(s);
while(testMatcher.find())
{
result ++;
}
return result;}
我做错了什么
<$ p $ p>
final BufferedReader br = new BufferedReader(new StringReader(hello\\\
\\\
world\\\
));
String line;
int empty = 0;
while((line = br.readLine())!= null){
if(line.trim()。isEmpty()){
empty ++;
}
}
System.out.println(空);
I am using the following code to count empty lines in Java, but this code returns a greater number of empty lines than there are.
int countEmptyLines(String s) {
int result=0;
Pattern regex = Pattern.compile("(?m)^\\s*$");
Matcher testMatcher = regex.matcher(s);
while (testMatcher.find())
{
result++;
}
return result;}
What am I doing wrong or is there a better way to do it?
解决方案
Try this:
final BufferedReader br = new BufferedReader(new StringReader("hello\n\nworld\n"));
String line;
int empty = 0;
while ((line = br.readLine()) != null) {
if (line.trim().isEmpty()) {
empty++;
}
}
System.out.println(empty);
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