java 在字符之间添加空格
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Adding space between characters
提问by Babu R
I want to add space after every two chars in a string.
我想在字符串中的每两个字符后添加空格。
For example:
例如：
javastring
I want to turn this into:
我想把它变成：
ja va st ri ng
How can I achieve this?
我怎样才能做到这一点？
回答by Mark Byers
You can use the regular expression '..'to match each two characters and replace it with "$0 "to add the space:
您可以使用正则表达式'..'来匹配每两个字符并将其替换"$0 "为添加空格：
s = s.replaceAll("..", "s = s.replaceAll("..(?!$)", "int n =2;
StringBuilder str = new StringBuilder("ABCDEFGHIJKLMNOP");
int idx = str.length() - n;
while (idx > 0){
str.insert(idx, " ");
idx = idx - n;
}
return str.toString();
");
");
You may also want to trim the result to remove the extra space at the end.
您可能还想修剪结果以删除末尾的额外空间。
See it working online: ideone.
看看它在线工作：ideone。
Alternatively you can add a negative lookahead assertion to avoid adding the space at the end of the string:
或者，您可以添加否定前瞻断言以避免在字符串末尾添加空格：
str = "ABCDEFGH" int idx = total length - 2; //8-2=6
while (8>0)
{
str.insert(idx, " "); //this will insert space at 6th position
idx = idx - n; // then decrement 6-2=4 and run loop again
}
回答by Nitin Divate
//Where n = no of character after you want space
//Where n = no of character after you want space
AB CD EF GH
Explanation, this code will add space from right to left:
说明，这段代码会从右到左添加空格：
public static String insertCharacterForEveryNDistance(int distance, String original, char c){
StringBuilder sb = new StringBuilder();
char[] charArrayOfOriginal = original.toCharArray();
for(int ch = 0 ; ch < charArrayOfOriginal.length ; ch++){
if(ch % distance == 0)
sb.append(c).append(charArrayOfOriginal[ch]);
else
sb.append(charArrayOfOriginal[ch]);
}
return sb.toString();
}
The final output will be
最终输出将是
String result = InsertSpaces.insertCharacterForEveryNDistance(2, "javastring", ' ');
System.out.println(result);
回答by Arif Nadeem
I wrote a generic solution for this...
我为此写了一个通用的解决方案......
##代码##Then call it like this...
那就这样叫吧……
##代码##