Groovy By default in Map Numeric values considered as Big decimal

Question

I have created a Map in groovy:

def measureMap = [:]
measureMap.put('engine.temperature', 70.0)
measureMap.put('fuel.level', 71.0)

The values for this map considered as Bigdecimal.

Is there any reason for this.

Why I am asking this i know the hierarchy

java.lang.Object
java.lang.Number
java.math.BigDecimal

so I thought by default it should consider it as double/float .

Answer 1

By default, Groovy uses BigDecimal for decimal numbers. This is documented:

Conveniently for exact decimal number calculations, Groovy choses java.lang.BigDecimal as its decimal number type. In addition, both float and double are supported, but require an explicit type declaration, type coercion or suffix. Even if BigDecimal is the default for decimal numbers, such literals are accepted in methods or closures taking float or double as parameter types.

If you need your values to be double-typed in the map, you can add the familiar D or F suffixes for double/float literals:

measureMap.put('engine.temperature', 70.0d) //java.lang.Double
measureMap.put('engine.temperature', 71.0f) //java.lang.Float