字符串.contains() [英] String .contains()

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本文介绍了字符串.contains()的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

大家好,


我发现String java api不包含String.contains(char aChar)方法,我感到很惊讶。它有一个类似于charsequence的方法,但不是我需要的方法。


因此,除非有人告诉我错误,否则我想出另一种方式。


如果我有一个char aChar =''x''


那么一个字符串aString =" test"


如果我这样做aString.indexOf(aChar);


我会得到aChar的索引号还是-1如果它不在那里?


那么如果返回-1,我可以返回false ???


问候


Brendan

Hi all,

I was rather suprised to find that the String java api doesn''t contain String.contains(char aChar) method. It has a similar method for a charsequence but not one for what i need.

So unless someone tells me im wrong I ve come up with a another way.

If i have a char aChar = ''x''

then a String aString = "test"

if i do this aString.indexOf(aChar);

will I either get the index number of aChar or -1 if it isn''t in there??

So then i can return false if -1 is returned???

Regards

Brendan

推荐答案

是的,您也可以使用String作为indexOf()方法的参数,例如

" foobar" .indexOf(" ; oba")== 2


亲切的问候,


Jos
Yep, you can also use a String as an argument for the indexOf() method, e.g.
"foobar".indexOf("oba") == 2

kind regards,

Jos


欢呼Jos,


我开始为自己思考!!
cheers Jos,

I''m starting to think for myself!!


毕竟我不是那么聪明......


aString =" three"

aChar =''e''


由于多次出现,aString.indexOf(aChar)的返回是什么?
I''m not so smart after all....

aString = "three"
aChar = ''e''

What would be the return of aString.indexOf(aChar) because of multiple occurences?


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