[Solved] What is the default value of an unassigned object . ( edit : Now answered 🤩)

Question

In java,
When an object is defined but not assigned, e.g.
MyClass obj;
what happens? is the value null, can it be compared to null, or is there an error at compile time?

Answer 1

if you did not Define The Value The initial Values will be as follows

1) Boolean - false
2) byte - 0 (byte)
3) short - 0 (short)
4) int - 0
5) long - 0L
6) char - \u0000
7) float - 0.0f
8) double - 0.0d
9) Object Reference - null

Answer 2

In the case of local variables:

https://docs.oracle.com/javase/specs/jls/se7/html/jls-4.html#jls-4.12.5

"A local variable must be explicitly given a value before it is used, by either initialization or assignment, in a way that can be verified using the rules for definite assignment."

Answer 3

null 💗🙌🤗

Answer 4

For primitive types 0
For reference types null
For boolean false

Answer 5

Ace thanks.

Answer 6

Yesh Jadav there is no error. it displays the string provided as expected, now that you changed the initial code to get variables initialized.

Answer 7

Ace So why do I have an error in the playground?
"variable might not have been initialised"
https://code.sololearn.com/c540uBwzKuus/?ref=app

Answer 8

@Hatsy Rei and @Ace can you explain whats this error
https://code.sololearn.com/c7X7wO7YS1e3

Answer 9

always null

Answer 10

Obj will have null value

Answer 11

its null :)