java 在java字符串中的两个字符之间添加点
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/11785756/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Adding dot between two characters in java string
提问by user1486269
I have a string:
我有一个字符串：
String x = "10";
Now I want to add .between the numbers and print it like this
现在我想.在数字之间添加并像这样打印
1.0
How can I achieve this?
我怎样才能做到这一点？
回答by dasblinkenlight
You can split the string into the first character and the rest of the string, and then insert a dot '.'in between, like this:
您可以将字符串拆分为第一个字符和字符串的其余部分，然后'.'在中间插入一个点，如下所示：
String res = x.substring(0,1)+"."+x.substring(1);
// ^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^
// the first digit the rest of the string
You can also use replaceAllto do it on longer strings, like this:
您还可以使用replaceAll在更长的字符串上执行此操作，如下所示：
String orig = "19,28,37,46";
System.out.println(orig.replaceAll("(\d)(\d)", "."));
This prints
这打印
1.9,2.8,3.7,4.6
回答by user1329572
Use the DecimalFormatclass to better decouple the value and its representation.
使用DecimalFormat该类可以更好地解耦值及其表示。
回答by kgautron
If the String is always a 2-digit number :
如果字符串始终是 2 位数字：
String result = x.charAt(0) + "." + x.charAt(1);
