Is there a remainder (%) operator in Apex?

No. 17 % 5 fails with "Found punctuation symbol or operator '%' that isn't valid in Apex". Use Math.mod(17, 5), which returned 2 in my test.

What does Math.mod return for negative numbers?

The result keeps the sign of the first number: Math.mod(-17, 5) returned -2. Math.mod returns an Integer for Integer inputs and a Long for Long inputs.

What are the logical operators in Apex?

&& (AND), || (OR) and ! (NOT). AND and OR short-circuit, so s != null && s.length() > 0 is safe when s is null.

Why does 17 / 5 return 3 in Apex?

Dividing two Integers gives an Integer and drops the fraction. Use a Decimal on one side, such as 17.0 / 5, to get 3.4.

Does == compare Strings case-sensitively in Apex?

No. == ignores case for Strings, so 'ABC' == 'abc' is true. Use equals() for a case-sensitive comparison.

Operators in Salesforce Apex: Full List with Examples

Operators in Salesforce Apex are the symbols you use to calculate, compare and combine values: arithmetic (+ - * /), comparison (== != < >), logical (&& || !), assignment (= += -=), bitwise, the ternary ? :, safe navigation ?. and null coalescing ??. One operator is missing: Apex has no % remainder operator; use Math.mod(x, y) instead.

I ran every operator below in the Developer Console of a Salesforce Developer Edition org, including the % error and the results of integer division and Math.mod with negative numbers, so you can see exactly what Apex returns.

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