Monday, April 15, 2013

Why Are These 2 Strings Not Equal? - Java | Dream.In.Code


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    4 Replies - 42 Views - Last Post: Today, 11:31 AM Rate Topic: -----

    #1 Pmike2004 ?Icon User is offline

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    Posted Today, 10:55 AM

    
 public class help{   public static void main(String [] args) { String a = "This is a test!"; String b = "This is a"; b = b + " test!"; System.out.println(a+ " " +B)/>; if (a == B)/> System.out.println("they are equal"); else System.out.println("nope, not equal"); }  } 

    Is This A Good Question/Topic? 0

    Replies To: Why are these 2 strings not equal?

    #2 Maynia ?Icon User is online

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    Re: Why are these 2 strings not equal?

    Posted Today, 10:59 AM

    Don't use == to compare Strings, broadly speaking. That compares the equality of the underlying String objects (reference equality), and since you created two of those:
    
 String a = "This is a test!"; String b = "This is a"; 

    they're not equal on the object level. What you want for comparing the contents of Strings is equals(), called on one String and passing in another, thusly:

    
 string1.equals(string2) 

    This post has been edited by Maynia: Today, 11:00 AM


    #3 CasiOo ?Icon User is online

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    Re: Why are these 2 strings not equal?

    Posted Today, 11:00 AM

    you need to use the .equals method when comparing Strings
    
 if (a.equals(B)/>) 


    #4 andrewsw ?Icon User is online

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    Re: Why are these 2 strings not equal?

    Posted Today, 11:16 AM

    FWIW .equals() is the way to go, but the following two strings are equal due to a process called string interning.
    
        String a = "this is a test";         String b = "this is a test";         System.out.println((a == B));    // true

    which isn't happening with the code in the first post (using concatenation +).

    The following includes a null check:

    
System.out.println((a == null ? b == null : a.equals(B)));    // true

    This post has been edited by andrewsw: Today, 11:23 AM


    #5 andrewsw ?Icon User is online

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    Re: Why are these 2 strings not equal?

    Posted Today, 11:31 AM

    String interning (page from 2007)

    Page 1 of 1


    Source: http://www.dreamincode.net/forums/topic/318490-why-are-these-2-strings-not-equal/

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