What is the equivalent of java's long datatype in dart ? should int or long be used?

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In Java:

long: The long data type is a 64-bit two's complement integer. The signed long has a minimum value of -2^63 and a maximum value of 2^63-1. In Java SE 8 and later, you can use the long data type to represent an unsigned 64-bit long, which has a minimum value of 0 and a maximum value of 2^64-1. Use this data type when you need a range of values wider than those provided by int. The Long class also contains methods like compareUnsigned, divideUnsigned etc to support arithmetic operations for unsigned long.

In Dart:

int Integer values no larger than 64 bits, depending on the platform. On the Dart VM, values can be from -2^63 to 2^63 - 1. Dart that’s compiled to JavaScript uses JavaScript numbers, allowing values from -2^53 to 2^53 - 1.

So, you can exactly use int in Dart for the equivalent of long in Java. But beware of the caveat when compiled to JavaScript.