Using Java reflection class to create an object and use it in arraylist

Question

I started to use Java Reflection recently but currently stuck at this.

So I have something like this:

Class<?> dogClass = Class.forName("com.example.dog");
Object dogObject = dogClass.newInstance();

I would like to use the above object in this arraylist:

List<Dog> dogList = new ArrayList();

So in normal case:

for(Dog d : dogList) {
....
.... 
}

But when I tried to use the java reflection, it doesn't work..

for(dogObject d : dogList) {
....
.... 
}

Can anyone enlighten me please? Thank you.

The for loop iterates over the objects already existing in the list. Where is the relationship to the new object you’ve just created? What do you want to achieve? — Holger
– Holger, Commented Sep 19, 2018 at 6:50

Jack Flamp · Accepted Answer · 2018-09-18 07:31:48Z

2

for(dogObject d : dogList) is wrong. dogObject is an object and not a type. add your dogObject to dogList and then loop it like you do in the first loop:

Class<?> dogClass = Class.forName("com.example.Dog");
Dog dogObject = (Dog)dogClass.newInstance();
List<Dog> dogList = new ArrayList<Dog>();
dogList.add(dogObject);
for (Dog dog : dogList) {
   ....         
}

(and you need to add try/catch of course)

answered Sep 18, 2018 at 7:31

Jack Flamp

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Comments

Ganesh Toni · Accepted Answer · 2018-09-18 07:33:22Z

0

Syntax of foreach loop is like below

for(T Obj: Objects) {
....
.... 
}

but in your code you are using Obj in-place of T (Object Type). It's wrong way of coding for each loop. in your code dogObject is instance of reflection class dogClass so java will throw compile error.

answered Sep 18, 2018 at 7:33

Ganesh Toni

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