如何使用 JAVA 8 Lambda 表达式在 List<String> 中修剪()字符串
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how to trim() String in List<String> using JAVA 8 Lambda expression
提问by Sathish Kumar k k
I am looking for all type of string manipulation using java 8 Lambda expressions.
我正在寻找使用 java 8 Lambda 表达式的所有类型的字符串操作。
I first tried the trim()
method in simple String
list.
我首先尝试了trim()
简单String
列表中的方法。
String s[] = {" S1","S2 EE ","EE S1 "};
List<String> ls = (List<String>) Arrays.asList(s);
ls.stream().map(String :: trim).collect(Collectors.toList());
System.out.println(ls.toString());
For this example, I was expecting to get [S1, S2 EE, EE S1]
,
but I got [ S1, S2 EE , EE S1 ]
.
对于这个例子,我期待得到[S1, S2 EE, EE S1]
,但我得到了[ S1, S2 EE , EE S1 ]
。
回答by Eran
collect()
produces a new List
, so you must assign that List
to your variable in order for it to contain the trimmed String
s :
collect()
产生一个 new List
,因此您必须将其分配List
给您的变量,以便它包含修剪后的String
s :
ls = ls.stream().map(String :: trim).collect(Collectors.toList());