Following are the two approaches:
- constructor with all the class properties
Pros: I have to put an exact number of types of parameters so if I make an error the compiler warns me ... |
Is there a standard acceptable convention for parameters in Java to straightforward constructors and setters? (I've seen the answer for C++, but practices are often different between the two communities)
Suppose ... |
Please forgive the length, but here are two programs, both the exact same, but one with and one without setters, getters, and constructors.
I've taken a basic C++ class before and don't ... |
I know that private instance variables are accessed through their public getters and setters method.
But when I generate constructors with the help of IDE, it initializes instance variables directly instead of ... |
I am parsing an XML file where one of the fields I want to be immutable, ID, has to be set after the object is created. Should I set it to ... |
What are the pro's and con's of calling out to a mutator from a constructor (if any)
i.e.:
public MyConstructor(int x) {
this.x = x;
}
versus:
public MyConstructor(int x) {
setX(x);
}
public void setX(int ...
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I am working on a Java project after a period using C++ and C#, and I have a doubt about best practices for field initialization in constructors. Basically, suppose I have ... |
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To initialize an instance, we can use either a default constuctor and a number of setters, or a constructor with a long parameter list. In the latter way the object state ... |
I am still very confused about getter and setter methods. I had this code;
public class MethodsInstances {
public MethodsInstances(String name){
girlName ...
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I am validating input data in setter method and don't want to validate it again in constructor. I wonder if calling the setter in the constructor is good idea?
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Hi there, Just a quick concept question. Are there any opinions out there with regards to constuctors calling its own class setter methods to initialise its instance fields? I've recently used this technique a couple of times and I have had no issues with it. It works quite well as I can keep all my validation code in the setters and ... |
class Base { double value; Base(double value) { this.value = value; report(); } void report() { System.out.println("Value is " + value); } } class Ext extends Base { int div = 1000; Ext(double value) { super(value); } void report() { // this looks innocent enough, but the beahviour // is a little counterintuitive System.out.println("Value in kilounits is " + (value / ... |
Well here's my little bit of advice: Put each class in a java file with the same name e.g. class1.class is in a file named class1.java. This makes looking at your files a lot easier. I think that should also solve your problem. You should post the errormessage you're getting from the compiler. Edited by: 106498II on Oct 5, 2007 2:05 ... |
/** * Creates a new item with a given quantity and price. * The constructor use three helper methods. * * @param itemName * enter a String for the name of the item. * @param itemQuantity * enter an integer for the quantity of the item. * @param itemPrice * enter a double for the price of the item. */ |
In general, you don't want to call non-final, non-private methods from within a c'tor. It can lead to unexpected or undesirable behavior, including corrupt (incompletely constructed) objects being used as if they were valid. Additionally, you often (maybe even usually) want member variables to be final. For these reasons, you generally assign to members directly in the c'tor, rather than calling ... |