Java Programming - Language Fundamentals - Discussion

Hi All,

default values are given as follows:
Int------>0
String---> null
Dog (Object)------->null
Char -------------->"\u0000". it is hexa decimal representation of asii code of the chars. I think "\u0000" represents "space".
boolean------------> false.

Done.

Hi , in the given programe the dog is a object ,
which may any data type
the below programe illistreates

class Dv
{
int x;
}

class DefaultValues
{
public static void main(String str[])
{
Dv dog=new Dv();

int a[] = new int[5];
float b[] = new float[5];
double c[] = new double[5];
String d[] = new String[5];
char e[] = new char[5];
boolean f[] = new boolean[5];
System.out.println("Hi ,The Default Values: ");
System.out.println("For Object :"+dog.x);// here dog is object
System.out.println("Integer "+a[0]);
System.out.println("Float "+ b[0]);
System.out.println("Double " + c[0]);
System.out.println("String " + d[0]);
System.out.println("Character " + e[0]);
System.out.println("Boolean " + f[0]);
}
}

How can a char has a default value in terms of hexa-decimal?
Can any one clear?

That shows in hexa representation
java is same as c ,we can say this by this because java uses the syntax of c. for more advantages and comfortable they created java as platform independent

Integer 0.
Float 0. 0.
Double 0. 0.
String null.
Character has nothing as default value.

Is that Dog is a user define data type.
Or we can say that Dog is a object of a class.
class A
{
...
...
}
class B
{
A Dog=new A();
}

How we know the meaning of hexadecimal representation by looking?

Dog is not a primitive data type but you can define data types according to you in java. Here we are defining a class and its type is "Dog". I mean we have declare a Dog type class. Now when you create its object that is MyDog, it will contain "null" value.

class A
{
...
...
}
class B
{
A Dog=new A();
}

Here class a is non premitive datatype and Dog is as object reference variable which holds the object referenced.

How did you all came to know that '/u0000' is hex and what is exactly char default value null or space??