Linked Questions
17 questions linked to/from Can I use Class.newInstance() with constructor arguments?
49
votes
2
answers
67k
views
How to create instance of a class with the parameters in the constructor using reflection? [duplicate]
for example:
public class Test {
public static void main(String[] args) throws Exception {
Car c= (Car) Class.forName("Car").newInstance();
System.out.println(c.getName());
}
...
- 7,406
1
vote
2
answers
2k
views
Why newInstance throws InstantiationException in my code? [duplicate]
I have two process as shown below. Each of my process has run and shutdown method
Process processA = new ProcessA("processA", getProcessAProperties());
Process processB = new ProcessB("processB", ...
- 11.8k
178
votes
11
answers
485k
views
How do I pass a class as a parameter in Java?
Is there any way to pass class as a parameter in Java and fire some methods from that class?
void main()
{
callClass(that.class)
}
void callClass(???? classObject)
{
classObject.somefunction
...
user562350
66
votes
7
answers
24k
views
Writing a single unit test for multiple implementations of an interface
I have an interface List whose implementations include Singly Linked List, Doubly, Circular etc. The unit tests I wrote for Singly should do good for most of Doubly as well as Circular and any other ...
- 6,444
1
vote
5
answers
6k
views
Create different objects depending on type
I have a database table that contains a column named type. For every row in my database column I have to create an object depending on the type. At the moment I use if else statements for that:
if (...
- 6,912
2
votes
4
answers
2k
views
Use the command line to make new objects
In my program, the user needs to input what type of players the game will have. The players are "human", "good" (for a good AI), "bad" (for a bad AI) and "random" (for a random AI). Each of these ...
- 98
2
votes
1
answer
4k
views
Is it possible to create an instance of parameterized class in Java?
I have the same logic in classes creation, but actual classes are different. Is it possible somehow to create an instance of a parameterized class?
Here is an example:
public class MyClass <E ...
- 3,784
2
votes
3
answers
667
views
Wrong results with Junit parameterized
I changed a junit test class to run with Parameterized to test two different implementations of the same interface. Here it is :
@RunWith(Parameterized.class)
public class Stack_Tests {
private ...
- 608
4
votes
1
answer
1k
views
Create different Java classes based on runtime config text
I have a suite that can run a few operations with different parameters. The operations and their parameters are provided in an XML config file.
There is a separate class implementing each operation. ...
- 1,115
2
votes
1
answer
1k
views
How should I select which concrete implementation should be instantiated based on the user choice?
I have an interface Fruit with two implementations Apple and Banana. I want to create a Fruit instance. The choice whether the concrete implementation should be an Apple or a Banana should be made by ...
- 4,670
0
votes
2
answers
1k
views
java instantiating object without knowing which subclass it will belong to until runtime
Scenario:
I have a hierarchy of subclasses all inheriting from a single distance ancestral class. All super classes in the hierarchy are abstract, so the only concrete classes are those without ...
-1
votes
1
answer
1k
views
Android java unable to load class
hi am unable to load class in my android app , i can load basic class but when i Initialize context in that class then am not able to load it
public class main {
// Initalize context
Context ...
-3
votes
1
answer
418
views
Java calling method from generic class
Is something like that possible.
List<?> myList = getMyList();
class cls = class.forname("com.lab.myClass");
cls = myList.get(0);
cls.getValue();
Create an Instance with the fully-qualified ...
- 198
0
votes
2
answers
213
views
Instantiate Object with constructor arguments in a generic method
I am currently attempting to write a method which returns a new array of a generic type filled with objects of random values but I am struggling with the creation of the Objects.
Let's say I have a ...
- 1,772
2
votes
4
answers
127
views
Returning Interface instead Class<Interface>
I wrote my own classloader, which works with classes, which implements interface Plugin. But I can't cast Class to Plugin. What's wrong?
public Plugin load(String pluginName, String ...
- 257