How to use the Comparable CompareTo on Strings in Java

Question

I can use it to sort by emp id but I\'m not sure if it is possible to compare strings. I get an error the operator is undefined for strings.

public int compa         


        

Answer 1

Java String already implements Comparable. So you could simply write your method as

public int compareTo(Emp emp) {
   return this.getName().compareTo(emp.getName());
}

(ofcourse make sure you add proper validations such as null checks etc)

Also in your code, do not try to compare Strings using '=='. Use 'equals' method instead. '==' only compare string references while equals semantically compares two strings.