String.equals

[Bin Wu]

Refer to the following code:
\\many codes here
StringBuffer s1 = new StringBuffer( "String" );
StringBuffer s2 = new StringBuffer( "String" );
if ( s1.equals( s2 ) )
{
System.out.println( "TRUE" );
}
else
{
System.out.println( "FALSE" );
}
//many codes here.
This code compiled no error with output is "FALSE".
I know equals() is the method which declared in class String, why can we called by class StingBuffer directly here?
Besides, why can we get the result "TRUE" if we change variable type of s1 from StringBuffer to String instead of "FALSE" with the type is StringBuffer? Thanks.

[sunilkumar ssuparasmul]

String class has equlas method overridden so it returns true where as in case StringBuffer equals method is not overridden it uses object's equals(as all classes extend object by default) method which performs reference comparision so it returns false.

Hth
sunil.s
------------------
"Winners don't do different things
They do things differently"

[Tom Tang]

Hi, Bin:
You can refer to the following thread for a roundup. Hope it helps.
http://www.javaranch.com/ubb/Forum24/HTML/006994.html

[Bin Wu]

Sunikumar,Tom, thanks a lot for your great help. I see.