All Questions
9
questions
0
votes
2
answers
241
views
Constructor Chaining and Visibility in Java
Consider this class:
public class Passenger {
public Passenger() {
}
public Passenger(int freeBags) {
this(freeBags > 1 ? 25.0d : 50.0d);
this.freeBags = freeBags;
}
...
- 185
107
votes
4
answers
74k
views
Private constructor in Kotlin
In Java it's possible to hide a class' main constructor by making it private and then accessing it via a public static method inside that class:
public final class Foo {
/* Public static method */...
- 1,900
-2
votes
1
answer
58
views
In Java, what do you call a class with a private constructor or many private constructors? [closed]
What would it mean if a class had only private
constructors?
Can you name such a class?
- 93
-2
votes
2
answers
173
views
How to set a GUI non-visible within the constructor?
I have a swing GUI class Foo and in the constructor of Foo class, I load some values from the databases. Based on the returning values from database, I can say whether this GUI should be visible or ...
- 777
7
votes
3
answers
2k
views
Java, compilation error, Constructors
I have been trying a mock ocjp 6 test. I went though a question asking if the constructor is correct :
1- public Test8(){}
2- private void Test8(){}
3- protected Test8(int k){}
4- Test8(){}
The ...
- 567
0
votes
2
answers
57
views
Is there an elegant way to change what methods/variables an object of a class can use based on the constructor used to create this object?
So for example, when the object is constructed with lets say a constructor without arguments, this object is able/"allowed" to use a certain subset of the methods defined in the class, and when the ...
- 3,166
1
vote
1
answer
132
views
Java UNIXProcess not visible in Eclipse?
I tried to use the UNIXProcess.class, but the eclipse keeps warning me that UNIXProcess is not visible.
The code is simple:
import java.lang.Process;
public class Simple {
UNIXProcess process;
...
- 2,514
22
votes
7
answers
37k
views
Aren't Java constructors public by default? [duplicate]
I have two classes in two different packages. For one class I've defined a constructor without setting access modifier for it. I want to instantiate an object of this class in another package and get ...
- 59.9k
3
votes
4
answers
122
views
Why my object sees variables which were not given to it in the constructor?
I have the following code. Which is "correct" and which I do not understand:
private static void updateGUI(final int i, final JLabel label) {
SwingUtilities.invokeLater(
new Runnable() {
...
- 129k