Compare 2 objects - urgent

Question

hi all
i have a problem.
I want to compare two objects but dono how.
Object obj1=null, obj2=null;
Vector vec = new Vector()
obj1=vec
Vector vec1=new Vector()
obj2=vec
now i want to compare if(obj1 == obj2)
how can i do this
help out plzzzzzzzzzzzzzzzzz
thanx

Answer 1

Nope, I'm still scratching my head over this one.
However, there are two comparisions in java.
==, and .equals() method
== just checks to see if the Object is the same Object
.equals() is defined to check if one Object is equal to another.
quick example:
  String s1 = new String("Hello");
  String s2 = s1;
  String s3 = new String("Hello");
  String s4 = new String("GoodBye");
  s1 == s2;  // true because they are the same object
  s1.equals(s2) // true because they have the same underlying value
  s1 == s3  // false because they are different objects
  s1.equals(s3) // true, because the are the same underlying value
  s1 == s3 // false
  s1.equals(s4)// also falseAny time you want to compare the VALUE of two objects, use the .equals method.
So in this case,
if (oldObj.equals(newObj)) is the way to go
If you are dealing with vectors/lists, the equals method will compare every item in oldObj with every item in newObj. If they are all equal, then it will return true.
Hope this helps,
evnafets