How to use substring in android studio.

Sample sub String code

String text="abc-01-001";        
String sub_text=text.substring(7);        
System.out.println(sub_text);

This will give "001" as the output.

But in your question two strings are not in same length so the substring will not give the correct answer to all strings. So it it better to use split method to get correct results. See below code sample,

String []splitArray=text.split("-");
String new_text=splitArray[2];        
System.out.println(new_text);

This will also give "001" as the output.