Java Programming - Language Fundamentals - Discussion

Is there any primitive data type named Dog?

What is the use of data type 'Dog'. I didnt heard about that!

Hi All,

Dog - There is no primitive datatype like 'Dog'. It is a User Defined type (a class created by User). By default it will hold null value.

For example:

public class Dog
{
//...
}

Dog myDog;

Here myDog will contain 'null' value by default.

Hope you understand. Have a nice day!

Not able to undestand the given question.

Can anyone please explain it to me?

Dear Sir,

1) Default value for array element of type char is nothing , not even null
2) Default value for array element of type float is 0.0 not 0.0f

class hello
{
public static void main(String str[])
{
int i[] = new int[5];
float f[] = new float[5];
double d[] = new double[5];
String s[] = new String[5];
char c[] = new char[5];
boolean b[] = new boolean[5];

System.out.println("Hello World");
System.out.println("Integer "+i[0]);
System.out.println("Float "+ f[0]);
System.out.println("Double " + d[0]);
System.out.println("String " + s[0]);
System.out.println("Character " + c[0]);
System.out.println("Boolean " + b[0]);
}
}

What your are tryng to admit from this program?

How option 4 is correct? I could not understand. Please explain about the default data type of char.

@Shaswati

It is nothing but a class created by a user.

Ex: Dog, Student, Car etc.

The question is 'what will be default value?'.


Student objStud1;

Here objStud1 will contain 'null' value by default.

HI,
No where the "Dog" datatype is mentioned.
If Dog is integer , the default might be -0
If Dog is float , the default might be -0.0f
If Dog is object ,the default might be -null
.... No where it is mentioned whether Dog is wat datatype.
HELP ME IN THIS REGARD.....

Dog - There is no primitive datatype like 'Dog'. It is a User Defined type. By default it will hold null value.