我是否需要做一些特殊的事情才能将替换方法与符号一起使用？

Question

Here's some code

private String replaceToEncrypt(String password) {
    password.replace('A','@');
    password.replace('E','=');
    password.replace('I','!');
    password.replace('J','?');
    password.replace('O','*');
    password.replace('P','#');
    password.replace('R','&');
    password.replace('S','$');
}

Using print statements its seems that nothing happens because ABCDEFGHIJKLMNOPQRSTUVWXYZ before this method is ABCDEFGHIJKLMNOPQRSTUVWXYZ after

Thanks

Answer 1

You have to re-assign the result of each replacement, for example:

password = password.replace('A','@');

This is because all Strings in Java are immutable, and any operation that modifies a String what really does is return a new String with the modifications, the original String is kept unchanged.

Answer 2

replace() according to the Java 7 API:

Returns a new string resulting from replacing all occurrences of oldChar in this string with newChar.

So in your code you need to reassign to password the new String:

password = password.replace('A','@');
//etc...