Re: String comparison using equals() and ==

Patricia Shanahan <>
Sat, 22 Aug 2009 07:12:19 -0700
Christian wrote:

Daniel Pitts schrieb:


public class Strings {
    public static void main(String[] args) {
        String a = "hello";
        String b = "hello";
        String b2 = new String("hello");
        String b3 = new String(a);
        String b4 = (Math.random() < 1.0f ? "h" : "") + "ello";
        System.out.println("a = " + a);
        System.out.println("b = " + b);
        System.out.println("b2 = " + b2);
        System.out.println("b3 = " + b3);
        System.out.println("b4 = " + b4);
        System.out.println("a==b = " + (a==b));
        System.out.println("a==b2 = " + (a==b2));
        System.out.println("a==b3 = " + (a==b3));
        System.out.println("a==b4 = " + (a==b4));
a = hello
b = hello
b2 = hello
b3 = hello
b4 = hello
a==b = true
a==b2 = false
a==b3 = false
a==b4 = false

this output was actually what I had expected.
Though I had this described above on some linux jdk (should be 1.6 but
don't know which)
Actually it gave me a hard time when I tried to show someone that string
comparison with == does not work in Java..

May be it was just an error in recompilation.. though I remember that I
finally had to read in a String from to definately show that
== does not work.

Could you see if you can reproduce the bugs, either using Daniel's
program, or an SSCCE of your own that you can post? Do you remember the
details such as the compiler and JVM you used?


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