检查字符串是否包含 n Java

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 newlinen.";        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

truefalsefalsefalse

回应您的评论：

class newlineTest {    public static void main(String[] args) {        String word = "testn.";        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.7test .