Inner Classes

[kathir vel]

Hi
In this following program,
Given:
1. public class TestObj {
2. public static void main(String[] args) {
3. Object o = new Object() {
4. public boolean equals(Object obj) {
5. return true;
6. }
7. }
8. System.out.println(o.equals("Fred"));
9. }
10. }
What is the result?
A. An exception occurs at runtime.
B. true
C. fred
D. Compilation fails because of an error on line 3.
E. Compilation fails because of an error on line 4.
F. Compilation fails because of an error on line 8.
G. Compilation fails because of an error on a line other than 3, 4, or 8

I thought Answer is F(because before line 8 there sholud be statement seperator ';').But in the book it shows the correct answer is G.
Can anybody clarify this answer?It will be very helpful for me.Thanks.

[Amit M Tank]

There is a mistake in the book. You are correct the correct answer is F.

[Chandra Bhatt]

I suspect if F is the correct answer. Line 3 starts with anonymous class
implementation. Eclipse gives error at line 7 as your code goes. Rather answer
'G' looks more genuine.


Thanks,

[Sandeep Bangalore]

G is the correct answer.
The compilation error is at Line 7(semicolon missing).

[kathir vel]

If we compile this program ,we get error like this...

TestObj.java :8: ';' expected
System.out.println(o.equals("Fred"));

This error shows ..so it is in Line 8.Isn't it?

[Janaranjani K]

It is because of the curly brace at line 7. At line 3, instead of semi colon, a open curly brace is used, because of that the compiler reports that semicolon is missing at line 8, since the block opened at line 3 ends at line 7.

[Mallik Avula]

HI i confuced about this
Compiler giving error at line 8:
but the couse is because of missing semicolon at line 7
but the statement started at line 3 (3 to 7 only one statement)
what shuold be the correct answer
regards
Mallik

[Manfred Klug]

Hi,

the question asks which line contains the error and not which line is reported by the compiler. And I think there is no doubt that line 7 is the faulty one.

[Sandeep Bangalore]

Let me make it clear.

In line 4, an inner class is being created, and the definition of the inner class ends on line 7.
Since inner class is a member of the enclosing class, you have to end the definition by a semicolon, as you do for any other class member.