从java中的字符串中修剪换行符
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Trimming new line character from a string in java
提问by Vicky
The output of below program:
以下程序的输出：
public class TestClass {
public static void main(final String[] args){
String token = "null\n";
token.trim();
System.out.println("*");
System.out.println(token);
System.out.println("*");
}
}
is:
是：
*
null
*
However
然而
How to remove newlines from beginning and end of a string (Java)?
says otherwise.
否则说。
What am I missing?
我错过了什么？
采纳答案by Sotirios Delimanolis
Since Stringis immutable
因为String是不可变的
token.trim();
doesn't change the underlying value, it returns a new Stringwithout the leading and ending whitespace characters. You need to replace your reference
不会改变底层值，它返回一个String没有前导和结束空格字符的新值。您需要更换您的参考
token = token.trim();
回答by NPE
Strings are immutable. Change
字符串是不可变的。改变
token.trim();
to
到
token = token.trim();
