检查字符串是否包含\ n Java
如何检查字符串是否包含\ n或换行符?
word.contains("\\n")word.contains("\n")
回答:
如果字符串是在同一程序中构造的,则建议使用以下命令:
String newline = System.getProperty("line.separator");boolean hasNewline = word.contains(newline);
但是,如果您指定使用\ n,则此驱动程序说明了如何做:
class NewLineTest { public static void main(String[] args) {
String hasNewline = "this has a newline\n.";
String noNewline = "this doesn't";
System.out.println(hasNewline.contains("\n"));
System.out.println(hasNewline.contains("\\n"));
System.out.println(noNewline.contains("\n"));
System.out.println(noNewline.contains("\\n"));
}
}
导致
truefalse
false
false
回应您的评论:
class NewLineTest { public static void main(String[] args) {
String word = "test\n.";
System.out.println(word.length());
System.out.println(word);
word = word.replace("\n","\n ");
System.out.println(word.length());
System.out.println(word);
}
}
结果是
6test
.
7
test
.
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