java 定义一个Rectangle类，该类提供getLength和getWidth方法。

1.15 定义一个Rectangle类，该类提供getLength和getWidth方法。利用图1-18中的findMax例程编写 一种main方法，该方法创建一个Rectangle数组并首先找出依面积最大的Rectangle对象，然后 找出依周长最大的Rectangle对象。

import java.util.Comparator;

public class Rectangle {
    private int length;
    private int width;

    public Rectangle(int length,int width) {
        this.length = length;
        this.width = width;
    }

    public int getLength() {
        return length;
    }

    public void setLength(int length) {
        this.length = length;
    }

    public int getWidth() {
        return width;
    }

    public void setWidth(int width) {
        this.width = width;
    }

    public int getArea() {
        return length * width;
    }

    public int getAllLength() {
        return length +width;
    }

    public String getName(){

        return "("+width+","+length+")";

    }

    public static <AnyType> AnyType findMax(AnyType[] arr, Comparator<AnyType> cmp) {
        int maxIndex =0;
        for (int i=1;i<arr.length;i++) {
            if (cmp.compare(arr[i],arr[maxIndex])>0){
                maxIndex = I;
            }
        }
        return arr[maxIndex];
    }

    public static class MyComparatorArea implements Comparator<Rectangle>{
        @Override
        public int compare(Rectangle o1, Rectangle o2) {
            return o1.getArea()-o2.getArea();
        }
    }

    public static class MyComparatorLength implements Comparator<Rectangle> {
        @Override
        public int compare(Rectangle o1, Rectangle o2) {
            return o1.getAllLength()-o2.getAllLength();
        }
    }

    public static void main(String[] args) {
        Rectangle rectangle =new Rectangle(3,4);
        Rectangle rectangle2 =new Rectangle(4,4);
        Rectangle rectangle3 =new Rectangle(5,2);

        Rectangle[] temp = new Rectangle[] {rectangle,rectangle2,rectangle3};
        System.out.println(findMax(temp,new MyComparatorArea()).getName());
        System.out.println(findMax(temp,new MyComparatorLength()).getName());
    }
}

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