obj

default constructor

main

default specifier specifies access level of class
eg:-
class A{
}
this is default
default constructor is constructor with same name as of 
class and no arguments
eg: class A{
A()
}
there is no default method in java

default specifier is private

default constructor is className(){}

there is no default method in java

default specifier is-default
default constructor
no default method

DEFAULT SPECIFIER IN JAVA:
There are 4 types of accessibility specifier in java, they
are private,public,protected and default.
There is no key word in java to specify default specifier 
When we do not specify any specifier which means default
specifier,

For Example :
 public String getName(){...} 
// here accessibility specifier  is public

 String getName(){...} 
// here accessibility specifier is defalut, whose scope    
is package-scope means this method is not accessible outside
the current package

DEFAULT CONSTRUCTOR IN JAVA:
Default constructor is the implicit constructor provided by
the compiler when we do not specify any constructor in our class
Default constructor looks like..
---------------------------------
<Access Modifier> <class_name>(){
super();// implicit super call
}

I have not heard about any default method in java..As far my
knowledge there is no default method till JAVA platform 1.4....

Default Specifier is : friendly. but there is no keyword 
provided by java

Default Construtor is : the constructor of top level super 
class of each java class that is "Object" class.

Default Method is : main method that would called by 
default through the java interpretor.

DEFAULT SPECIFIER IN JAVA IS CALLED AS PACKAGE ACCESS

DEFAULT SPECIFIER IN JAVA IS CALLED AS CLASS NAME() WHICH 
WAS PROVIDED BY COMPILER DURING COMPILATION TIME

THERE IS NO DEFAULT METHOD IN JAVA