Anonymous Inner Class

[Anvi Dixit]

Hello Everyone,

Please find below the question asked in the K & B book.

 public interface Runnable { void run(); }
Which construct an anonymous inner class instance? (Choose all that apply.)
A. Runnable r = new Runnable() { };
B. Runnable r = new Runnable(public void run() { });
C. Runnable r = new Runnable { public void run(){}};
D. Runnable r = new Runnable() {public void run{}};
E. System.out.println(new Runnable() {public void run() { }});
F. System.out.println(new Runnable(public void run() {}));
 
  

now here the answer is E. But there is a mistake . please have a look on the statement.

System.out.println(new Runnable() {public void run() { }});

just before the semicolon there is a bracket ), which should not be there as i believe.
Please let me know whether i am correct or not.

Thanks in advance
Anvi Dixit

[Cory Max]

It seems like the brackets all line up to me:

    
System.out.println
  (
    new Runnable() 
    {
      public void run() 
        { 
        }
    }
  );

[Keith Lynn]

Originally posted by Anvi Dixit:
Hello Everyone,

Please find below the question asked in the K & B book.

 public interface Runnable { void run(); }
Which construct an anonymous inner class instance? (Choose all that apply.)
A. Runnable r = new Runnable() { };
B. Runnable r = new Runnable(public void run() { });
C. Runnable r = new Runnable { public void run(){}};
D. Runnable r = new Runnable() {public void run{}};
E. System.out.println(new Runnable() {public void run() { }});
F. System.out.println(new Runnable(public void run() {}));
 
  

now here the answer is E. But there is a mistake . please have a look on the statement.

System.out.println(new Runnable() {public void run() { }});

just before the semicolon there is a bracket ), which should not be there as i believe.
Please let me know whether i am correct or not.

Thanks in advance
Anvi Dixit

The ) is necessary to complete the SOP.

This code would be the equivalent of

Runnable r = new Runnable() {public void run() { }};
 
System.out.println(r);

[Anvi Dixit]

Thanks Keith and Cory .

I got ..infact i missed out that the bracket is for the SOP.

Thanks again
Anvi