anonymous-inner-class

Instantiating anonymous inner classes in Java with additional interface implementation

由 丶灬走出姿态 提交于 2019-12-10 17:15:40
问题 Let's say I have the following two class/interface definitions: public abstract class FooClass { public abstract void doFoo(); } and public interface BarInterface { public void doBar(); } If I want to make an anonymous inner class that extends/implements both, do I need to do this: public abstract class BothClass extends FooClass implements BarInterface {} ... new BothClass() { public void doFoo() { System.out.println("Fooooooooo!!!!"); } public void doBar() { System.out.println("Baaaaaaaar!!

Can you create anonymous inner classes in Swift?

由 岁酱吖の 提交于 2019-12-10 01:59:06
问题 I'm tired of declaring entire classes as having the ability to handle UIAlertView clicks by making them extend UIAlertViewDelegate . It starts to feel messy and wrong when I have multiple possible UIAlertView s, and have to distinguish which was clicked in the handler. What I really want is to create a single object that implements the UIAlertViewDelegate protocol, and give this one-off object to my UIAlertView when showing it. I want something like this: let confirmDelegate =

How to use Outer Method's input in Anonymous Inner Class?

由 ◇◆丶佛笑我妖孽 提交于 2019-12-08 09:10:04
问题 For Instance how can I use the input 'hasTypedSomeToken' in my Anonymou inner class in the following - public class Login { void display(boolean hasTypedSomeToken) { //some code here Button btnLogIn = new Button("Login", new ClickHandler() { @Override public void onClick(ClickEvent event) { if(Login.this.hasTypedSomeToken) //HOW TO USE hasTypedSomeToken HERE { //do something } } } } 回答1: The variables declared within a method are local variables. e.g. hasTypedSomeToken and btnLogIn are local

Why require local variables to be final when accessing from anonymous inner classes?

由 若如初见. 提交于 2019-12-07 15:55:50
问题 We all know you can't do things like this: int a = 7; new Runnable() { public void run() { System.out.println(a); } }.run(); ... ...without making a final. I get the technical reason why and it's because local variables live on the stack and you can't safely make a copy unless you know it won't change. What I struggle to see however is why the compiler doesn't have an implementation hack so that it when it sees the above situation it compiles down to something like: int[] a = {7}; new

How to use Outer Method's input in Anonymous Inner Class?

由 落爺英雄遲暮 提交于 2019-12-06 16:23:50
For Instance how can I use the input 'hasTypedSomeToken' in my Anonymou inner class in the following - public class Login { void display(boolean hasTypedSomeToken) { //some code here Button btnLogIn = new Button("Login", new ClickHandler() { @Override public void onClick(ClickEvent event) { if(Login.this.hasTypedSomeToken) //HOW TO USE hasTypedSomeToken HERE { //do something } } } } The variables declared within a method are local variables. e.g. hasTypedSomeToken and btnLogIn are local variables in your display method. And if you want to use those variables inside a local inner class (classes

Is there a syntax to get the reference to an anonymous inner class from a further anonymous inner class?

由 孤街浪徒 提交于 2019-12-06 03:09:56
问题 Consider this case: public class SomeClass { public void someMethod() { new SomeInterface() { public void someOtherMethod() { new SomeOtherInterface() { new someThirdMethod() { //My question is about code located here. } }; } }; } } Is there a syntax to reference the instance of the anonymous inner class represented by SomeInterface at the commented code? For SomeClass you can do SomeClass.this Is there an equivalent to get the implementation of SomeInterface? If not, of course you can just

Why require local variables to be final when accessing from anonymous inner classes?

由 假装没事ソ 提交于 2019-12-05 20:43:41
We all know you can't do things like this: int a = 7; new Runnable() { public void run() { System.out.println(a); } }.run(); ... ...without making a final. I get the technical reason why and it's because local variables live on the stack and you can't safely make a copy unless you know it won't change. What I struggle to see however is why the compiler doesn't have an implementation hack so that it when it sees the above situation it compiles down to something like: int[] a = {7}; new Runnable() { public void run() { System.out.println(a[0]); } }.run(); ... Then we're in the position where it

Can you create anonymous inner classes in Swift?

由 一个人想着一个人 提交于 2019-12-05 01:47:32
I'm tired of declaring entire classes as having the ability to handle UIAlertView clicks by making them extend UIAlertViewDelegate . It starts to feel messy and wrong when I have multiple possible UIAlertView s, and have to distinguish which was clicked in the handler. What I really want is to create a single object that implements the UIAlertViewDelegate protocol, and give this one-off object to my UIAlertView when showing it. I want something like this: let confirmDelegate = UIAlertViewDelegate() { func alertView(alertView: UIAlertView!, clickedButtonAtIndex buttonIndex: Int) { // Handle the

How can I pass a non final variable to an anonymous inner class?

由 浪尽此生 提交于 2019-12-05 00:25:54
问题 I have these lines of code. I know you can not pass a non final variable to an inner class but I need to pass the variable i to the anonymous inner class to be used as a seatingID. Can you suggest ways of doing that ? JButton [] seats = new JButton [40]; //creating a pointer to the buttonsArray for (int i = 0; i < 40; i++) { seats[i] = new JButton();//creating the buttons seats[i].setPreferredSize(new Dimension(50,25));//button width panel4seating.add(seats[i]);//adding the buttons to the

How would an anonymous class get GC'd in picasso on Android?

由 泪湿孤枕 提交于 2019-12-04 20:27:34
Can someone explain to me the comment here : Don't create anonymous class of Target when calling Picasso as might get garbage collected. Keep a member field as a strong reference to prevent it from being gc'ed Per line 30 of ImageViewAction.java , that Callback is a strong reference. ImageViewAction(Picasso picasso, ImageView imageView, Request data, boolean skipCache, boolean noFade, int errorResId, Drawable errorDrawable, String key, Callback callback) { super(picasso, imageView, data, skipCache, noFade, errorResId, errorDrawable, key); this.callback = callback; } Assuming the Callback is an
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