如何在包含dot的java中替换String？

Question

I need to replace a String which contains white space and periods. I have tried with the following code:

String customerName = "Mr. Raj Kumar";

customerName = customerName.replaceAll(" ", "");
System.out.println("customerName"+customerName);

customerName = customerName.replaceAll(".", "");
System.out.println("customerName"+customerName); 

but this results in:

customerName Mr.RajKumar

And

customerName

I am getting the correct customer name from the first SOP, but from second SOP I am not getting any value.

Answer 1

escape the dot, or else it will match any character. This escaping is necessary, because replaceAll() treats the first paramter as a regular expression.

customerName = customerName.replaceAll("\\.", "");

You can do the whole thing with one statement:

customerName = customerName.replaceAll("[\\s.]", "");

Answer 2

在代码中使用它只是为了删除句点

customerName = customerName.replaceAll("[.]","");

Answer 3

您可以简单地使用str.replace（“。”，“”）并且它将替换所有出现的点，记住只有一个区别在于替换和替换所有，后来使用正则表达式作为输入字符串，其中第一个使用简单字符序列。