I'm working with JIntegra java com bridge.
I have an object of type Object which true coclass is unknown.
I need to check if that object can be casted to specific COM interface ... |
If I have:
class foo implements Cloneable
and then do:
bar = new foo();
bar.clone();
I get a shallow copy without needing to write any bar.clone() code like I normally would need to do when ... |
I need to write a function that accepts an object , but I want to enforce in the function call (not after the function is called) that the object is an ... |
I need to do some refactoring in Java, and I need to maintain some degree of binary compatibility. In this case I want to remove some legacy interfaces, that are not ... |
EDIT: Solved, see below
Hi,
In Java, I got an object that could be of any class. BUT - that object will always have to implement an interface, so when I call methods ... |
I am working on a project to develop a poker bot, I have to store the state of every hand that is played. I wanted to do this via an object ... |
I have an interface and two objects implementing that interface, massively simplied;
public interface MyInterface {
public int getId();
public int getName();
...
}
public ...
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interface Int {
public void show();
}
public class Test {
public static void main(String[] args) {
...
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interface TestA { String toString(); }
public class Test {
public static void main(String[] args)
{
System.out.println(new TestA() { public String ...
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When I was analysing a code in my project, I came accross this situation.
I have got an Interface Class with complete String Constants declaration as below
public interface SampleInterface {
...
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using UI-Model i have a problem in blue J the problem code is
" class Operation is public , should be declared in a file named Operation.jave"
model class
import java.util.*;
import java.awt.*;
import javax.swing.*;
import ...
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I am new to Java. I want to know when should we use base class's reference and when we should create a new object. I mean we can write
List list ...
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I've an existing method which looks like this:
public void parseMessage(String message){
...
...
...
}
and the method is called ... |
I have object that I want to create using object that implements two interfaces (suppose, I can't modify object's class to create third interface that will be extends two interfaces). What ... |
Is there a overhead or performance issue in passing whole object vs passing
primitive value as in option 1 and 2?.
[ EDIT: I meant to say passing a reference of a Java ... |
I've got an interface MigrateScenario with its methods. I also have its implementation MigrateScenarioImpl. The instance of MigrateScenarioImpl is being serialized and then passed as a byte[] to some web-service. On ... |
So I am just at the beginning of writing a game in Java and I am writing my game objects. Now I have read here in Evolve Your Hierarchy ... |
I have the following:
interface File
{
String name();
...
}
interface FileService
{
List<File> getAllFiles();
...
}
While working with the such interface If I decided to delete an entity represented by ... |
I am using an API that gives access to a certain set of subclasses with a common interface. I use the interface throughout my code, and the instances are resolved to ... |
Suppose I have this
interface Movable
{//some stuff}
And I have
class Car implements Movable
{//some stuff}
And also maybe I have
class Bike implements Movable
{//some stuff}
I noticed that if I had this:
ArrayList<Movable> movableThings = new ArrayList<Movable>();
movableThings.add(some kind ...
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I need to do some tinkering with lots of Callable objects, for which I need to find a way to access parts of it, before call(). I move the data in ... |
First, check out this document first:
http://htmlcleaner.sourceforge.net/doc/org/htmlcleaner/TagNode.html
It have a function called:
getAllElementsList(boolean isRecursive).
and it will return me something called:
List
Ok, when I go to this the document ... |
Please be gentle while answering, I am not a java developer (or developer in General)
While trying xml parsing with java I came across following -
NodeList nodelist = document.getElementsByTagName("item");
Herein xml dom ... |
Does it change one object to another? if Imonitor is an interface what does Imonitor[] x = new Imonitor(); means? Does that mean we can create objects of interfaces?
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I’m currently facing a design problem and would appreciate advice on how I could resolve it:
The problem
I will use an example to illustrate my problem note this is just an example:
Suppose ... |
I have some class that works with interfaces:
here is interface
public interface Orderable
{
int getOrder()
void setOrder()
}
here is worker class:
public class Worker
{
private List<Orderable> ...
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Today I had a bit of an argument with a friend who claimed that an interface object can be created. When I said that it's impossible, he showed me the following ... |
Does any Java Interface implicitly implements java.lang.Object?
This question arose when I did something like this:
public static String[] sizeSort(String[] sa) {
Comparator<String> c = new Comparator<String>() {
...
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A friend and I are studying Java. We were looking at interfaces today and we got into a bit of an discussion about how interfaces are used.
The example code my ... |
I am writing a particle transport code. In this code physical objects implement an interface Volume. One implementer of Volume is the case of interest for this code-- the Particle class. ... |
A few days ago I got an assignment to make (amateur) model of my universities course and student management system (just core program, no gui) . I was successful in creating ... |
to clone the object do i need to implement 'cloneable' interface. because here my class is a jar file(i mean API). so i can't edit the class. i heard that all ... |
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Don't know the right place to put the question but anyway! My question is what would have been the changes pros or cons IF the java.lang.Object was an interface. The only thing that I can see is the implementation of the methods must have been a must for every class. More interstingly, What would have been the situation if it was ... |
Since you have no answers so far, I'll take a wild guess here ... any chance you are not picking up the same class files at runtime that you see at compile time? Obviously the method was there at compile time or the compiler would have objected. But the runtime can't find the method ... maybe an old class file? Double ... |
Mike An object is another way of saying an instance of a class. If I have a class named Dog I can have an object of type Dog, this is an object that has been created using a constructor from the Dog class. It is an instance of a Dog. An interface is a structure that defines a set of behavior ... |
Hi there, i want to ask a simple question? I know many of you will laugh on me... but cant we really create the object of interface? i m not asking to implement the interface and then create the object of that class..... i m asking direct object creation of interface type..... |
what exactly an interface object contains when we declare it to achieve correct method invocation? how it correctly works? suppose i have two interfaces each having one method with same method name. a class implements this interface. how using an interface object and assigning that object a class object calls the method from that interface only??? |
What about the below line numbers for the below code.When do we use them.What could be the possible cause for assiging class objects to an interface reference? interface IStack{ public void push(); public Object pop(); } class StackImpl implements Istack{ public void push(){ some code written } public Object pop(){ return Object; } interface ISafeStack extends IStack{ boolean isEmpty(); } class ... |
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actually this is not an object of an interface however in a piece of code like this one you are extending/implementing the specified class/interface and then you override the needed methods. this method is named anonymos classes. and if you ever written swing code all your listeners are generally created in this way. |
Hi I have been working on org.w3c.dom.* package. And have been doing some development that is similar to http://www.genedavis.com/library/xml/java_dom_xml_creation.jsp But I have a question that I am unable to understand. I tried to read up on Java API page on Element, Document, Text, Node etc But on the documentation page it shows that Element, Text and almost all things within this ... |
Hi, Recently came to an interesting basic question, couldn't find the answer. The Question is, Do the interface also have default methods defined in the Object class. If not how this works; Interface Test{ } class TestImpl implements Test{ } class Run { public static void main(String args[]){ Test test = new TestImpl(); System.out.println(test.toString()); } } Thanks in advance. Ashish |
The writeObject and readObject are optional methods that you can implement in your class. When they are there, they will be called by the JVM when your object is serialized or deserialized. If you don't implement these methods, then the JVM will serialize and deserialize the object using a default format. These methods are not defined in any interface anywhere. They ... |
Hi , i am working on this code. how to achieve runtime casting for the following code public interface Type extends Serializable{ void clear(); public String getName(); } public interface Composite extends Type{ public Type[] getComponents(); public Type getComponent(int number); } public class Varies extends Object implements Type{ /** * Returns the data contained by this instance of Varies. */ public ... |
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I'm trying to understand, how the interface "Context" (based on java doc API ) in this case is used to create an object of type Context. From what I had learnt, objects can be created only from classes not interface. Can some one share some light on this concept. //This is how one creates a import javax.naming.Context; import javax.naming.InitialContext; Context initContext ... |
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i know that interfaces can not be instantiated. but i saw in one book , the below line: SafeStackImpl safeStackRef = new SafeStackImpl(10); IStack istackRef = safeStackRef ; SafeStackImpl is a class and IStack is an interface. Message was edited by: mythri This did not create an instance of an interface (directly); it created an instance of the class and a ... |
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You JDBC driver provides classes that implement those interfaces. Call getClass on one of them to see what. Incidentally, what did you think interfaces were for, if they never contain any code? I only ask because this question comes up every other day, and nobody asking it ever seems to question why these interface thingies exist |
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you still can't invoke howToEat() without having a reference to a class whose static type implements that method. i don't know where you got that book, but i'd say it's an example of how not to do this. if you had passed in an Edible reference you could have actually taken advantage of polymorphism, eliminating the cast and the instanceof check. ... |
We can't create object for an interface like we do for classes. But absolutely no is not a good answer for this question because it is possible when an interface is implemented in a class. For eg: Map map = new HashMap(); Here Map is an interface implemented in a class named HashMap. The object map will refer to the class ... |
think of an interface as a contract. In this case the contract between someone writing code thats running on a webserver and someone who is actually writing the webserver. It basicly means the writers of the webserver have to pass you an object following the HttpServletRequest contract so you know what you will get. The actual implementation of how they create ... |