Very new to programming, could use some help with arraylist

[award]

I have been looking through forums but cannot find out how to create the arraylist in java. B1 and B2 are two big numbers typed in by the user. here is some code:

final int MAX = 1000;
List BigNum = new ArrayList();
BigNum.add(new Integer(B1));
 
final int MAX2 = 1000;
List BigNum2 = new ArrayList();
BigNum2.add(new Integer(B2));
 
System.out.println(BigNum);
System.out.println(BigNum2);
 

my problem is that when i try to compile it, it says that the class i am writing uses unchecked or unsafe operations. then it says recompile with -Xlint:unchecked for details.

What does this mean, what am i doing wrong? im sure its some silly mistake on my part, but i am very confused and could use some input.
greatly appreciated, thanks and have a good day!

[JosAH]

I have been looking through forums but cannot find out how to create the arraylist in java. B1 and B2 are two big numbers typed in by the user. here is some code:

final int MAX = 1000;
List BigNum = new ArrayList();
BigNum.add(new Integer(B1));
 
final int MAX2 = 1000;
List BigNum2 = new ArrayList();
BigNum2.add(new Integer(B2));
 
System.out.println(BigNum);
System.out.println(BigNum2);
 

my problem is that when i try to compile it, it says that the class i am writing uses unchecked or unsafe operations. then it says recompile with -Xlint:unchecked for details.

What does this mean, what am i doing wrong? im sure its some silly mistake on my part, but i am very confused and could use some input.
greatly appreciated, thanks and have a good day!

You're using Lists (ArrayLists) that can store any type of argument; that's what
the compiler is complaining about. Since version 1.5. you can use type-safe
generic containers:

List<BigInteger> myList= new ArrayList<BigInteger>();
myList.add(myBigNumber);
 

kind regards,

Jos

ps. don't start variables with a capital character; it's confusing.

[award]

thank you so much! it runs! yay:)

the only other thing i have no idea how to do, is we are supposed to have four numbers per spot on the array list. how to i break down my big number to take four numbers in at a time?

[JosAH]

thank you so much! it runs! yay:)

the only other thing i have no idea how to do, is we are supposed to have four numbers per spot on the array list. how to i break down my big number to take four numbers in at a time?

I don't understand what you want to ask exactly but for any number 'n', n%10000
are the rightmost four digits and n/10000 are all the digits *except* the last four
digits.

kind regards,

Jos

[award]

I don't understand what you want to ask exactly but for any number 'n', n%10000
are the rightmost four digits and n/10000 are all the digits *except* the last four
digits.

kind regards,

Jos

thank you very much for your help. i appreciate it. have a great day!