How to store a large 10 digits integer

Question

Which Java data type would be able to store a big numerical value  like 9999999999

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A primitive long or its java lang Long wrapper can also store ten digits

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you can use long or double

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You could store by creating an object that hold a string value number to store in an array list  by example  BigInt objt   new BigInt  999999999999999999999999999999999999999999999999999     objt is created by the constructor of BigInt class  Inside the class look like   BigInt   ArrayList lt Integer gt  myNumber   new ArrayList  lt Integer gt              public BigInt      public BigInt String number   for int i  i lt number length  i     myNumber add number indexOf i

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You can store this in a long  A long can store a value from -9223372036854775808 to 9223372036854775807

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Use BigInt datatype with its implicit operations  The plus point for it is it will not give answers in exponential representation  It will give full length result  Here is an example of addition        BigInteger big1   new BigInteger  1234567856656567242177779          BigInteger big2   new BigInteger  12345565678566567131275737372777569          BigInteger bigSum   big1 add big2         System out println bigSum

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Your concrete example could be stored in long  or java lang Long if this is necessary    If at any point you need bigger numbers  you can try  java math BigInteger  if integer   or java math BigDecimal  if decimal

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In addition to all the other answers I d like to note that if you want to write that number as a literal in your Java code  you ll need to append a L or l to tell the compiler that it s a long constant   long l1   9999999999      this won t compile long l2   9999999999L     this will work

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A wrapper class java lang Long can store 10 digit easily       Long phoneNumber   1234567890    It can store more than that also   Documentation   public final class Long extends Number implements Comparable lt Long gt                   A constant holding the minimum value a   code long  can        have  -2 lt sup gt 63 lt  sup gt                Native public static final long MIN VALUE   0x8000000000000000L                  A constant holding the maximum value a   code long  can        have  2 lt sup gt 63 lt  sup gt -1               Native public static final long MAX VALUE   0x7fffffffffffffffL      This means it can store values of range 9 223 372 036 854 775 807 to -9 223 372 036 854 775 808

[java] How to store a large (10 digits) integer?

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