May 2, 2011 · Java.util.collections methods usually use the boxed (Object-wrapped) versions, because they need to work for any Object, and a primitive type, like int or long, is not an Object. Another difference is that long and int are pass-by-value , whereas Long and Integer are pass-by-reference value , like all non-primitive Java types.

The Java spec allows both upper and lower case suffixes, but the upper case version for longs is preferred, as the upper case L is less easy to confuse with a numeral 1 than the lower case l. See the JLS section 3.10 for the gory details (see the definition of IntegerTypeSuffix ).

Java 8 provides a set of unsigned long operations that allows you to directly treat those Long variables as unsigned Long, here're some commonly used ones: String toUnsignedString(long i) int compareUnsigned(long x, long y) long divideUnsigned(long dividend, long divisor) long remainderUnsigned(long dividend, long divisor)

Long.MAX_VALUE is 9223372036854775807 (9,223,372,036,854,775,807 or 2 63-1). If you were executing your function once per nanosecond, it would still take over 292 years to encounter this situation according to this source .

Long is an object, while long is a primitive type. In order to compare them, you could get the primitive type out of the Long type:

In Java 8, unsigned long support was introduced. Still, these are typical longs, but the sign doesn't affect adding and subtracting. For dividing and comparing, you have dedicated methods in Long. Also, you can do the following: long l1 = Long.parseUnsignedLong("12345678901234567890"); String l1Str = Long.toUnsignedString(l1)

Yeah, just stick an "L" on the end of 1234567891011 to tell the compiler it's a long literal (otherwise the compiler will treat it as an int literal). – Daniel Lubarov Commented Apr 20, 2011 at 23:07

Aug 17, 2012 · In Java, a long is a signed 64 bits number, which means you can store numbers between -9,223,372,036,854,775,808 and 9,223,372,036,854,775,807 (inclusive).

Jan 10, 2014 · 1 Long is the object orientated counter part of long. The difference is as follows, and it applies to Float to float, Integer to integer etc. long is a primitive type, while Long is a Java class (and so it will inherit Object). long must be assigned …

Jun 19, 2010 · When calculating s2 first c and b are added (as long) and then a is added (promoted as long) thus no overflow occurs. final int a = Integer.MAX_VALUE; final int b = 1; final long c = 1L; final long s1 = a + b + c; final long s2 = c + b + a; System.out.println("s1=" + s1 + ", s2=" + s2); The output will be: s1=-2147483647, s2=2147483649