Can I use anonymous inner class to implement a interface?

[Bruce Sam]

I have tried several times,but can't find a method to implement
it.Could you give me some advice?

 

[Mike Schilling]

I have tried several times,but can't find a method to implement
it.Could you give me some advice?

The syntax is

new interfaceName() { ...method defs }

The class created is always a subclass of Object.

For instance, to implement a simple Comparator:

Comparator comp = new Comparator()
{
public Compare(Object o1, Object o2)
{
return o1 = o;
}
}

This creates an anonymous subclass of Object that implements Comparator.

 

[Ryan Stewart]

The syntax is

new interfaceName() { ...method defs }

The class created is always a subclass of Object.

For instance, to implement a simple Comparator:

Comparator comp = new Comparator()
{
public Compare(Object o1, Object o2)
{
return o1 = o;
}
}

This creates an anonymous subclass of Object that implements Comparator.

Except that
1) The method's name is "compare";
2) The compare method returns an int;
3) Your return statement
a) won't compile,
b) wouldn't do what you want if it did, and
c) would be the wrong return type even if it did what you want; and
4) You need a semicolon after the final brace.

Properly written, it would be:
Comparator comp = new Comparator() {
public int compare(Object o1, Object o2) {
return 0; // This will make all objects passed to this Comparator equal
}
};

 

[Bruce Sam]

Thanks Schilling,I have a follow question.How to access the method
Compare( ) that in this anonymous inner class?

 

[Ryan Stewart]

Thanks Schilling,I have a follow question.How to access the method
Compare( ) that in this anonymous inner class?

comp.Compare(o1, o2), though it should be "compare" as per my other post.

 

[Mike Schilling]

Except that
1) The method's name is "compare";
2) The compare method returns an int;
3) Your return statement
a) won't compile,
b) wouldn't do what you want if it did, and
c) would be the wrong return type even if it did what you want; and
4) You need a semicolon after the final brace.

Properly written, it would be:
Comparator comp = new Comparator() {
public int compare(Object o1, Object o2) {
return 0; // This will make all objects passed to this Comparator
equal
}
};

You'd think that by now I'd know to try something before posting it