Java code(convert array to arraylist)

Question

from the code,i found that convert string Array to ArrayList would success,but convert int Array to ArrayList will fail.
did only string work? if not, why? or this is fixed?

https://code.sololearn.com/cc5wFZXngU74

Answer 1

https://code.sololearn.com/cabVEhXWvPi0/?ref=app

I'm pretty sure it worked. When you declared your integer array, you forgot all of the letters. You had:

nt[] arr1 = {...};

You needed:

Integer[] arr1 = {...};

Answer 2

Well of course Rael . It isn't just needed for the arraylist; you need to use the correct keywords to declare EVERYTHING in statically typed languages like Java and C++ for the entire program to work. 'nt' isn't a Java keyword, so your program was failing there. It wasn't failing at the arraylist because the program never got there

Answer 3

ArrayList implements List and it inherited Collection. Collection is group of objects. int is not Object, String and Integer are objects so they are correct types

Answer 4

Zeke Williams oh it need full integer word ,instead of arraylist, any other need full name of data type? linkedlist?