如何使用java将点（。）替换为逗号（，）
问题描述：
我有一个字符串str = 12,12
我想用（逗号）替换。（点）进行十进制数计算，
目前我正在尝试这个：
I am having a String str = 12,12
I want to replace the ,(comma) with .(Dot) for decimal number calculation,
Currently i am trying this :
if( str.indexOf(",") != -1 )
{
str.replaceAll(",","\\.");
}
请帮助
答
你的问题不在于匹配/替换，但是String是不可变的，你需要分配结果：
Your problem is not with the match / replacement, but that String is immutable, you need to assign the result:
str = str.replaceAll(",","."); // or "\\.", it doesn't matter...