Does Integer.valueOf() accept a Decimal in Apex?

Yes. Integer.valueOf(myDecimal) compiles and, in my test, returned 7 for 7.8, the same as intValue(). It fails only when you pass text with decimals, such as Integer.valueOf('7.8'), which throws "Invalid integer: 7.8".

What is the difference between intValue() and round()?

intValue() drops the decimals (7.8 becomes 7, -7.8 becomes -7). round() rounds half to even by default, so 2.5 becomes 2 and 3.5 becomes 4; use round(System.RoundingMode.HALF_UP) for normal rounding.

Can I cast a Decimal to an Integer with (Integer)?

No. Casting a Decimal throws "System.TypeException: Invalid conversion from runtime type Decimal to Integer". Use intValue() instead.

How do I always round up a Decimal to an Integer?

Use Math.ceil(myDecimal).intValue(). In my test, Math.ceil(7.2) returned 8.

Why do I get a NullPointerException when converting?

The Decimal is null, for example an empty Currency field. Check if (amount != null) before calling intValue() or round().

Convert Decimal to Integer in Salesforce Apex (3 Ways)

To convert a Decimal to an Integer in Salesforce Apex, use myDecimal.intValue(), which drops the decimal part (7.8 becomes 7). Integer.valueOf(myDecimal) compiles and gives the same result. To round instead of truncating, use myDecimal.round(System.RoundingMode.HALF_UP).intValue().

Several tutorials disagree on what Integer.valueOf() and type casting do with decimals, so I tested every method in the Developer Console of a Salesforce Developer Edition org. Below are the real results, including two errors you should know about and a rounding default that surprises most developers.

This Tutorial Covers: