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

in java default specifier is public but within the 
samepackage.due to this property of public within same 
package we have to define public before the main method 
bcoz main has to be taken from jdk which is like the 
different package. So if we want to anythig accessing to 
the diffrent package we have to declare that with the 
public keyword explicitly. 

default constructor in java is same name of the class whose 
object has to be declared.
example
class v
{
public static void main(String vip[])
{
System.out.println("i am vip");
}
in this default constructor is v();

as much as i know ,there is no concept of default method

default specifier in java is DEFAULT
which can only be visible within the same package.
You can't access any default member of a class directly 
from outside the package ,  you can access those member 
through another method of that class.

default CONSTRUCTOR in java is the constructor which has 
the same name of the class and has no arguments. if you 
define at least one constructor in a class JVM will not put 
the default constructor in the class like..

public className(){super();}

if there is no constructor in the class JVM will put the 
default constructor in the class like..

public className(){super();}

since its not visible. but implicitly defined by compiler..


there is no concept of DEFAULT method in java spec.

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,the default specifier  access the with in package
only. 
EX:- public void setName(String name)
     {
       this.name=name;
     }
 The above method access any class or any package
   void setName(String name)
     {
       this.name=name;
     }
The above method can access with in package.

DEFAULT CONSTRUCTOR IN JAVA:-
THE default constructor in java is System default constructor.

EX:-
public class A
{
   String name;
    public void setName(String name);
     {
       this.name=name;
     }
}
The above program their is no constructor .then that time
java compiler created default constructor.

Note: we can interested see default constructor frist we
compile java program(javac A.java) after javap A.Then that
time u watch system default constructor.

DEFAULT METHOD IN JAVA:--
The dafault method in java is super().
EX:-
public class A
{
  A()
  {
   System.out.println("IAM CONSTRUCTOR FROM CLASS A ");
  }
}
public class B extends A
{
B()
{
System.out.println("IAM CONSTRUCTOR FROM CLASS B");
}
public static void main(String k[])
{
 B b=new B();
}
}
output:-
IAM CONSTRUCTOR FROM CLASS A 
IAM CONSTRUCTOR FROM CLASS B
hence super() method is default method