在安卓/ java中，我试图用 + 替换某些字符串的空间，但它似乎并没有工作。我是不是做错了？

 串串=Hello World的;
与string.replace（，+）;
 

解决方案

字符串对象是不可变的，所以替换方法不会改变字符串，但创建一个新的，你必须重新保存：

 串串=Hello World的;
串与string.replace =（，+）;
 

In android/java, I'm trying to replace the space in some strings with a +, but it doesn't seem to work. Am I doing it wrong?

String string="Hello world";
string.replace(" ", "+");

String objects are immutable, so the replace method doesn't change the string but creates a new one that you have to re-save:

String string="Hello world";
string = string.replace(" ", "+");