Java练习2

定义一个Rectangle类，该类提供getLength和getWidth方法，创建一个Rectangle数组并找出面积最大的Rectangle和周长最大的Rectangleangle。

package rectangle;

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

    public Rectangle() {

    }
    public Rectangle(float length, float width) {
        this.length = length;
        this.width = width;
    }
    public float getLength() {
        return length;
    }
    public void setLength(float length) {
        this.length = length;
    }
    public float getWidth() {
        return width;
    }
    public void setWidth(float width) {
        this.width = width;
    }
}

/**
 * 
 */
package rectangle;

import java.util.Comparator;

/**
 * @author kkquiet
 *
 *在该方法中找到面积最大和周长最大的rectangle对象
 */
public class Getmax {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO 找出周长最大和面积最大的Rectangle
        Rectangle [] arr = {new Rectangle(1,2), new Rectangle(3,4), new Rectangle(5,6), new Rectangle(1,3), new Rectangle(2,3)};
        Rectangle maxPeri = findPeriMax(arr, new PeriCmp());
        Rectangle maxArea = findPeriMax(arr, new AreaCmp());
        System.out.println("{"+maxPeri.getLength()+", "+maxPeri.getWidth()+"}");
        System.out.println("{"+maxArea.getLength()+", "+maxArea.getWidth()+"}");

    }
    //找出周长最大的Rectangle
    public static Rectangle findPeriMax(Rectangle [] arr, Comparator<? super Rectangle> cmp){
        int  mi = 0;
        for(int i = 0; i < arr.length; i++){
            if (cmp.compare(arr[i], arr[mi]) > 0)
                mi = i;
        }
        return arr[mi];
    }
    //找出面积最大的Rectangle
    public static Rectangle findAreaMax(Rectangle [] arr, Comparator<? super Rectangle> cmp){
        int  mi = 0;
        for(int i = 0; i < arr.length; i++){
            if (cmp.compare(arr[i], arr[mi]) > 0)
                mi = i;
        }
        return arr[mi];
    }
}

//周长的比较器
class PeriCmp implements Comparator<Rectangle>{
    public int compare(Rectangle r1, Rectangle r2){
        return 2*(r1.getLength()+r1.getWidth()) > 2*(r2.getLength()+r2.getWidth())?1:0;
    }
}
//面积比较器
class AreaCmp implements Comparator<Rectangle>{
    public int compare(Rectangle r1, Rectangle r2){
        return r1.getLength()*r1.getWidth() > r2.getLength()*r2.getWidth()? 1:0;
    }
}