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No.. Java supports both call by value and call by reference.. When primitive types are passed to a function they are passed by value.Objects are always passed call by reference and when u pass reference explicitly then call by value takes place.

In Java, its always call by reference

Java is strictly call by value. Objects only location of the obj on heap is passed. so when you edit it method the object in heap is modified.

with implementation perspective its always call by value.

Everything is by value. But note that when you declare an object, the variable is really a reference. Java passes object references by value.

Object obj = new Object();

Here obj is an object reference, and this reference is passed by value (copy of the reference is created) when passed to a method.

java supports only call by value.

but I have read many a times that base data types are send to a funtion by value while objects are send by refernce

it is call by value always.
for primitives, copies of the values are sent.
for objects, copies of the reference is sent.
public void method( object ref)
{
ref= new Object();// when the method finishes, you main method will still have the ref
to the original object..

}