Wroking with NavigableMap in groovy

comparable_keys.groovy

class X { int a}

def m2 = new TreeMap( [(new X(a:1)): 2, (new X(a:2)): 4] )

// this should throw execetion as Key (X) is not comparable

navigable_map.groovy

def map = [     90: 'A',
                75: 'B',
                60: 'C',
                50: 'D',
                35: 'E',
                0:  'F'
          ] as TreeMap
                
println map.keySet()
println map.descendingKeySet()

println map.firstEntry()
println map.lastEntry()

println map.floorEntry(22)
println map.ceilingEntry(22)

println map.floorEntry(60)
println map.ceilingEntry(60)

println map.floorEntry(92)
println map.ceilingEntry(92)