suppose class point2d has been defined storing 2-dimensional point x , y coordinates (both doubles). class includes following members:
your task modify class comparable adding appropriate compareto method. points should compared relative distance origin, points closer origin considered "less" points farther it. distance between 2 points defined square root of sum of squares of differences between x , y coordinates.
i'm unsure on how implement compareto method when there double. integers , strings use following syntax:
public int compareto(object name) { // comparing integers if (this.object != other.object) { return this.field - other.field; } else { // comparing strings return tostring().compareto(other.tostring()); } } is there generalized implementation strategy when comparing between 2 doubles, currency or point class above?
use int double.compare(double d1, double d2).
you should not this.field - other.field, since may return incorrect result in case of numeric overflow. use int integer.compare(int x, int y).
