如何从Java中的TreeMap中提取BigDecimals？

Question

I have a TreeMap with both values in BigDecimal, i'm trying to print some specific values so later i can do more complex operations, but i don't know which Map methods to use for BigDecimals, as the methods expect int values. This is my code :

Answer 1

Map methods expect Object or BigDecimal (depends on method). But int primitive type doesn't autoboxed to BigDecimal. You could create instance manually.

public class DemoApplication {

    public static void main(String[]args) {
        Map<BigDecimal, BigDecimal> map = new HashMap<>();
        // ...

        if (map.containsKey(BigDecimal.valueOf(400))) {
            System.out.println(map.keySet());
        }
    }

}

Answer 2

Here is an example showing you how you can use a BigDecimal as a key for a map. I will be using a hashmap for this example.

Map<BigDecimal. BigDecimal> map = new HashMap<>();
//assuming this map has some values in it.
if(map.containsKey(new BigDecimal(400)){
    //do something
}