StringBuffer

[aakash bhatt]

Hi all,
Why in StringBuffer class in both the cases it returns false
StringBuffer sb1 = new StringBuffer("Amit");
StringBuffer sb2= new StringBuffer("Amit");
System.out.println(sb1==sb2);
System.out.println(sb1.equals(sb2));
Regards,
aakash

[Arun Boraiah]

In case of �==�object reference are compared. Hence it returns false since sb1 and sb2 are in two different location.
Since equals method is not overridden in StringBuffer class. Default implementation from Object class is present in StringBuffer. The default implemation is again check for object reference, not the object value. Hence since sb1 and sb2 are referring different
memory location in the second case also it is returns false.

[aakash bhatt]

Hi Arun,
How should I compare 2 StringBuffer values for equality

[Thomas Paul]

Convert them to Strings and then do an .equals
if (sb1.toString().equals(sb2.toString()))

[Arun Boraiah]

just an extension to Thomas suggestion. Make sure that sb1 and sb2 is never null.