value « object reference « Java Class Q&A

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Java Class Q&A » object reference » value

1. Does the "new" keyword change the value of an object reference? stackoverflow.com

Let's say that I have a bunch of class instances that serve different purposes, so I want to be able to reference them directly by name:

SomeObject aardvark = new SomeObject();
SomeObject llama ...

2. Objects in Java Reference or Value stackoverflow.com

just for my understanding. Does my example code below actually changes the the color of my Car Object in the IntHashtable or does the first line creates another instance of ...

3. How to declare object reference variables and assign them values according to user input.? stackoverflow.com

I'm creating a command line Movie Register where the user has different ways to filter movies, directors and actors. I'm wondering if it's possible to declare some object reference variables and assign them ...

4. How to reference a Value in a created object after being created as part of a set stackoverflow.com

Hi I am kind of new to Java. As part of a uni tute[sic] we are creating insurance policies that can be taken out by a user. All different types of insurance can ...

5. Can objects be passed by value rather than by reference in Java? stackoverflow.com

Let's consider the following code in Java.

package obj;

final class First
{
    public int x;

    public First(int x)
    {
      ...

6. how are the objects passed by value or by reference coderanch.com

Java tenatively passes all parameters to a method 'by value.' That means the current value of the actual parameter is copied into the formal parameter in the method header. Essentially, parameter passing is like an assignment statement, assigning to the formal parameter a copy of the value stored in the actual parameter. This issue ultimately must be considered when making changes ...

7. Getting an reference to an object rather than a value coderanch.com

Are you sure that you want to use an arraylist when you are only using the first item? This looks to me more like a linked list which you could code by adding an airport variable like so: public class Airport { private String name = ""; private String code = ""; private Airport destination = null; public Airport(String name, String ...

8. How to make the reference object also null when the method makes its parameter null value? coderanch.com

Hi David, I don't understand this wrapper concept.Can you please enlighten me with a little more explanation. What if try returning the nullReference object as I have done in the below code . public class nullReference { public nullReference() { // TODO Auto-generated constructor stub } /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method ...

9. Objects 'Call by Reference' Instead of 'Call of Value'? coderanch.com

class Example2{ public static void main(String[] args){ int x = 5; List list = new ArrayList(); Example ex = new Example(); //Here when methodA is called a copy of argument x value will be directly passed. ex.methodA(x); //Here when methodB is called a reference of list will be passed. //And you pass the reference by its value. ex.methodB(list); } }

10. References to objects and variables and their values. forums.oracle.com

When does declaring a primitive type, variable or object as another objectm primitive type, or variable assign the variable THAT VALUE, and when does it just make it another reference to that object. And when it DOES just refer to that object, how do I set it to the value instead of just a reference? I can elaborate if necessary. I ...

11. reference value of object forums.oracle.com

12. Assign a value in Reference object doesn't reflect in Main object forums.oracle.com

You don't assign null to an object (that's meaningless), you assign it to the reference singleTone which is simply a local variable in your main method. You need to get the distinction between objects and references clear in your mind before you'll get anywhere in Java. An object is a structured block of memory, the reference is simply a variable which ...