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Asked: 2026-06-09T13:08:40+00:00

This is not new, but I wonder how come java can assign something like,

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This is not new, but I wonder how come java can assign something like, 1L to long datatype.

private static final long serialVersionUID = 1L;

where the definition of long data type is,

long: The long data type is a 64-bit signed two’s complement integer.
It has a minimum value of -9,223,372,036,854,775,808 and a maximum
value of 9,223,372,036,854,775,807 (inclusive). Use this data type
when you need a range of values wider than those provided by int.

From : Oracle, Java primitive datatypes

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1 Answer

  1. Editorial Team

    The L indicates that it is a long. In other words, 1 is an int whereas 1L is a long. It is specified in the Java Language Specification #3.10.1:

    An integer literal is of type long if it is suffixed with an ASCII letter L or l (ell); otherwise it is of type int.
    The suffix L is preferred, because the letter l (ell) is often hard to distinguish from the digit 1 (one).

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