Append string prefix if string doesn't have the prefix

Here is the one liner that appends the string with a prefix if the string doesn’t have a prefix

String newString = oldString.startsWith("someprefix") ? oldString
    : "someprefix" + oldString;

1 2	String newString = oldString.startsWith("someprefix") ? oldString : "someprefix" + oldString;

Append string prefix if string doesn’t have the prefix