How to remove single character from a String

You can also use the StringBuilder class which is mutable.

StringBuilder sb = new StringBuilder(inputString);

It has the method deleteCharAt(), along with many other mutator methods.

Just delete the characters that you need to delete and then get the result as follows:

String resultString = sb.toString();

This avoids creation of unnecessary string objects.

One possibility:

String result = str.substring(0, index) + str.substring(index+1);

Note that the result is a new String (as well as two intermediate String objects), because Strings in Java are immutable.

You can use Java String method called replace, which will replace all characters matching the first parameter with the second parameter:

String a = "Cool";
a = a.replace("o","");