Immutable Point, Line (*). Написать классы: 1. Point: int x, int y. 2. Line: Point start, Point end. Точка и линия должны быть неизменяемыми объектами (Immutable). Выполнить задачи: 1. Создать список разных линий. 2. Посчитать суммарный размер всех линий. 3. Найти самую длинную линию.

Line.java

package oop.lesson2.homework.lines;


public class Line {
    private final Point start;
    private final Point stop;

    public Line(Point start, Point stop) {
        this.start = start;
        this.stop = stop;
    }

    public final double length() {
        int catet1 = Math.abs(start.getX() - stop.getX());
        int catet2 = Math.abs(start.getY() - stop.getY());

        double result = Math.sqrt(Math.pow(catet1, 2) + Math.pow(catet2, 2));

        return result;
    }

    @Override
    public String toString() {
        return "Line{" +
                "start=" + start +
                ", stop=" + stop +
                '}';
    }
}

LineRunner.java

package oop.lesson2.homework.lines;


public class LineRunner {
    public static void main(String[] args) {
        Line[] lines = {new Line(new Point(3, 3), new Point(6, 6)), new Line(new Point(5, 5), new Point(10, 10))};

        System.out.println("Summary Lenght Line: " + sumLength(lines));
        System.out.println("Max Line: " + maxLengthLine(lines));

    }

    public static double sumLength(Line[] lines) {
        checkingLines(lines);

        double sum = 0;

        for(Line line : lines) {
            sum += line.length();
        }

        return sum;
    }

    public static Line maxLengthLine(Line[] lines) {
        checkingLines(lines);

        Line max = null;

        for(Line line : lines) {
            if(max == null || line.length()>max.length()){
                max = line;
            }
        }

        return max;
    }

    public static void checkingLines (Line[] lines) {
        if (lines.length == 0) {
            throw new IllegalArgumentException("Non Line element");
        }
    }
}

Point.java

package oop.lesson2.homework.lines;


public class Point {
    private final int x;
    private final int y;

    public Point(int x, int y) {
        this.x = x;
        this.y = y;
    }

    public final int getX() {
        return x;
    }

    public final int getY() {
        return y;
    }

    @Override
    public String toString() {
        return "Point{" +
                "x=" + x +
                ", y=" + y +
                '}';
    }
}