An anonymous inner class.

[Dejan Miler]

This is for K&B book on page 684.

An anonymous inner class can extend one subclass or implement one interface. Unlike non-anonymous classes (inner or otherwise), an anonymous inner class cannot do both. In other words, it cannot both extend a class and implement an interface, nor can it implement more than one interface.

Can some one give me an example of that

Dejan

[Ankur kothari]

dude try creating an anonymous inner class that extends a class.....now one that implements an interface....

now one that does both.....can you do that?

interface PineApple
{
void m();
}

interface PineApple1
{
void m()1;
}

//inside a class
PineApple p=new PineApple() implements PineApple1
{
public void m()
{
System.out.println("a")
}
public void m1(){}
};

do you think this is possible?

i think this is what the statement says...i interpreted this way

[Dejan Miler]

I do not think that this is what is say.
But thanks you trying.

Dejan

[Ankur kothari]

why dont you try.....what have you understood?

[Dejan Miler]

Interface cannot implements another interface

Dejan.

[Ankit Garg]

Dejan Miler wrote:I do not think that this is what is say.

The example given by Ankur is correct. Anonymous inner classes cannot implement or extend another class/interface

Type t = new Type() extends AnotherType {/*some code*/}      //wrong
Type t = new Type() implements AnotherType {/*some code*/}   //wrong
Type t = new Type() {/*some code*/}                          //correct

[Ankur kothari]

[Dejan Miler]

Thanks guys.
I also had the same opinion like you.
but still i wanted to check

Dejan.

[Ankur kothari]

[Dejan Miler]

I knew that this is not legal

Type t = new Type() extends AnotherType {/*some code*/}      //wrong   
Type t = new Type() implements AnotherType {/*some code*/}   //wrong   

But I had thinking that there is something that I am missing here.
So I decide to ask you guys

Dejan

[Folkert Meeuw]

public interface Anonymiziable {

	public String methodInnerA();
}

public interface AnonymiziableA {

	public String methodInnerA();
}

public interface Insideable extends Anonymiziable {

}
public class AnonymousInnerA
{
	//private	static int inner;

	public AnonymousInnerA()
	{
		
	}

	private void methodInnerA() {
		System.out.println("Referenz" + this);
	}

	
	class inner implements Insideable, AnonymiziableA {
		public String methodInnerA(){
			System.out.println(methodInnerA());
			return "Referenz" + this;
		}		

	} 

	public static void main(String[] args)
	{
		AnonymousInnerA i = new AnonymousInnerA();

		AnonymousInnerA.inner ii = i.new inner();
		
		System.out.println(ii.methodInnerA());	
	}
}

Dejan Miler wrote:This is for K&B book on page 684.

An anonymous inner class can extend one subclass or implement one interface. Unlike non-anonymous classes (inner or otherwise), an anonymous inner class cannot do both. In other words, it cannot both extend a class and implement an interface, nor can it implement more than one interface.

Can some one give me an example of that

Dejan

[Ankit Garg]

Hi Folkert welcome to javaranch.

Folkert, try to UseCodeTags when you post a source code. That way your code looks very good. Unformatted code is hard to read. You can add code tags by wrapping your code in [code] [/code] tags. You can edit your post using button...