instanceof

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What's the best way to check if an object can be dropped on another object without using instanceof?

I\'m developing a drag and drop shape editor. However I also need a way of \"connecting\" shapes together, where only specific shapes can be connected to other specific shapes. For example, a square c[详细]

2023-03-26 16:06 分类：问答
Generics - Legal alternative for (elements instanceof List<? extends Comparable>)

I have this method which unique parameter (List elements) sets elements to a ListModel, but I need to make a validation to see if the generic type implements comparable and since such thing like:[详细]

2023-03-26 06:48 分类：问答
Why can a constructor only return an object?

If there is a constructor like function a() {} then (new a) instanceof a === true But on the other hand, function a() { return {} }[详细]

2023-03-21 19:12 分类：问答
EntitySpriteMonster instanceof Entity... that simple and it doesnt work?

I have code like: class Entity; class EntityTool extends Entity; class EntitySprite extends Entity; class EntityToolSpoon extends EntityTool;[详细]

2023-03-19 12:48 分类：问答
Does "instanceof Void" always return false?

Can this method return true somehow? public static <T> boolean isVoid(T t) { 开发者_JAVA百科return t instanceof Void;[详细]

2023-03-19 06:40 分类：问答
What is the best way to verify multiple instanceof's with primitive types (eg: switch case)?

I\'ve searched for answers here and every thread I found were in fact \"fragments\" of what I seek. I\'d like to find a better way than this :[详细]

2023-03-18 04:38 分类：问答
instanceof keyword usage

Is using the instanceof keyword against the开发者_如何学JAVA essence of object oriented programming?[详细]

2023-03-18 00:08 分类：问答
How do you check both the exception's type as well as they type of the nested exception?

Suppose I catch an exception that is of type AppException but I only want to carry out certain actions on that exception if it has a nested exception of type StreamException.[详细]

2023-03-15 04:35 分类：问答
Reason behind using 'instanceof function() {}'?

On Mozilla Developer Center, there is a page about the Function.prototype.bind function and provides a compatibility function for browsers which do not support this function.[详细]

2023-03-13 17:23 分类：问答
Check ArrayList for instance of object

I have a java method that should check through an ArrayList and check if it contains an instance of a given class. I need to pass开发者_Python百科 the method the type of class to check for as a parame[详细]

2023-03-12 18:45 分类：问答