没有空格的Java字符串拆分

Question

I'm trying to split some user input. The input is of the form a1 b2 c3 d4. For each input (eg; a1), how do I split it into 'a' and '1'?

I'm familiar with the string split function, but what do I specify as the delimiter or is this even possible?

Thanks.

Answer 1

You could use String#substring()

String a1 = "a1"
String firstLetterStr = a1.substring(0,1);
String secondLetterStr = a1.substirng(1,a1.length());

Similarly,

String c31 = "c31"
String firstLetterStr = c31.substring(0,1);
String secondLetterStr = c31.substirng(1,c31.length());

Answer 2

If you want to split the string generically (rather than trying to count characters per the other answers), you can still use String.split(), but you have to utilize regular expressions . (Note: This answer will work when you have strings like a1, a2, aaa333, etc.)

String ALPHA = "\p{Alpha}";
String NUMERIC = "\d";

String test1 = "a1";
String test2 = "aa22";

ArrayList<String> alpha = new ArrayList();
ArrayList<String> numeric = new ArrayList();

alpha.add(test1.split(ALPHA));
numeric.add(test1.split(NUMERIC));
alpha.add(test2.split(ALPHA));
numeric.add(test2.split(NUMERIC));

At this point, the alpha array will have the alpha parts of your strings and the numeric array will have the numeric parts. (Note: I didn't actually compile this to test that it would work, but it should give you the basic idea.)

Answer 3

这真的取决于你以后如何使用数据，但除了split("")或通过索引访问单个字符之外，另一种分割成单个字符的方法是toCharArray() - 它只是将字符串分解为数组人物......

Answer 4

是的，有可能，你可以使用split("");

Answer 5

后使用分割用户输入到个人令牌split(" ")则可以使用分割每个令牌插入字符split("")使用空字符串作为分隔符）。

Answer 6

将空格拆分为一个字符串数组，然后使用String.charAt(0)和String.charAt(1)拉出单个字符

Answer 7

I would recommend just iterating over the characters in threes.

for(int i = 0; i < str.length(); i += 3) {
     char theLetter = str.charAt(i);
     char theNumber = str.charAt(i + 1);
     // Do something
}

Edit: if it can be more than one letter or digit, use regular expressions:

([a-z]+)(\d+)

Information: http://www.regular-expressions.info/java.html