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Comparing Strings
Strings example from a Well House Consultants training course
More on Strings [link]
Source code: ashton.java Module: J707
/* Comparing Strings
When you compare two objects with ==, you are checking to see if they point to one and the same object and NOT if the objects are identical; it is perfectly possible to have two identical objects at different memory locations. This is something to note particularly for / with strings, where an euqlity test with == is almost never what you want; you'll probably want the equals method instead, which typically tests content. */ public class ashton { public static void main(String[] args) { String affirm = "yes"; System.out.print ("Please enter yes or no : "); String you_said = WellHouseInput.readLine(); System.out.println("you said " + you_said); System.out.println("hoping for " + affirm); // you may guess the following will work but it will NOT. System.out.print("Trying \"==\" ... "); if (you_said == affirm) { System.out.println("GOT WHAT I WANTED"); } else { System.out.println("Oh dear ...."); } // But this WILL do what you hope for ... System.out.print("Trying \"equals\" ... "); if (you_said.equals(affirm)) { System.out.println("GOT WHAT I WANTED"); } else { System.out.println("Oh dear ...."); } } /* Sample Output: munchkin:j707 grahamellis$ java ashton Please enter yes or no : yes you said yes hoping for yes Trying "==" ... Oh dear .... Trying "equals" ... GOT WHAT I WANTED munchkin:j707 grahamellis$ java ashton Please enter yes or no : no you said no hoping for yes Trying "==" ... Oh dear .... Trying "equals" ... Oh dear .... munchkin:j707 grahamellis$ */ } Learn about this subject
This module and example are covered on the following public courses:
* Learning to Program in Java * Java Bootcamp * Java Programming for the Web Also available on on site courses for larger groups Books covering this topic
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Other Examples
This example comes from our "Strings" training module. You'll find a description of the topic and some
other closely related examples on the "Strings" module index page.
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