Java.math.RoundingMode several parameters detailed

Java.math.RoundingMode inside there are a few parameters make me a bit dizzy, now with a personal understanding of its summary:

To get a better understanding, we can draw an XY axis

Roundingmode.ceiling: Take the nearest integer to the right

Roundingmode.down: Remove the decimal part of the rounding, that is, positive to the left, negative numbers to the right, equivalent to the origin of the direction near the rounding

Roundingmode.floor: Take the nearest positive number to the left

Roundingmode.half_down: Five house six, negative number first to take the absolute value and then five six into the negative

ROUNDINGMODE.HALF_UP: Rounding, negative principle ibid.

Roundingmode.half_even: This comparison, the integer digits if the odd number is rounded, if even the five six into

Java.math.RoundingMode several parameters detailed