java.lang.String.replace问题的提示? [英] Hints for java.lang.String.replace problem?
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问题描述
我想替换。通过,在我想写入文件的String / double中。
I would like to replace "." by "," in a String/double that I want to write to a file.
使用以下Java代码
double myDouble = myObject.getDoubleMethod(); // returns 38.1882352941176
System.out.println(myDouble);
String myDoubleString = "" + myDouble;
System.out.println(myDoubleString);
myDoubleString.replace(".", ",");
System.out.println(myDoubleString);
myDoubleString.replace('.', ',');
System.out.println(myDoubleString);
我得到以下输出
38.1882352941176
38.1882352941176
38.1882352941176
38.1882352941176
为什么不替换做它应该做的事情?我希望最后两行包含一个,。
Why isn't replace doing what it is supposed to do? I expect the last two lines to contain a ",".
我是否必须做/使用别的东西?建议?
Do I have to do/use something else? Suggestions?
推荐答案
您需要将新值分配回变量。
You need to assign the new value back to the variable.
double myDouble = myObject.getDoubleMethod(); // returns 38.1882352941176
System.out.println(myDouble);
String myDoubleString = "" + myDouble;
System.out.println(myDoubleString);
myDoubleString = myDoubleString.replace(".", ",");
System.out.println(myDoubleString);
myDoubleString = myDoubleString.replace('.', ',');
System.out.println(myDoubleString);
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