[java] Removing the first 3 characters from a string

What is the most efficient way to remove the first 3 characters of a string?

For example:

'apple' change to 'le'  
'a cat' change to 'at'  
' a b c'change to 'b c'

Use the substring method of the String class :

String removeCurrency=amount.getText().toString().substring(3);