import java.util.Comparator;
/**
* 定義一個Rectangle類，該類提供getLength和getWidth方法。利用圖1-18中的findMax例程編寫
* 一種main方法，該方法創建一個Rectangle數組並首先找出依面積最大的Rectangle對象，然后
* 找出依周長最大的Rectangle對象。
* @author wulei
*/
public class RectangleTest {
/**
* 構造一個矩形
*/
private int width,height;
private String name;
public RectangleTest(int width, int height){
this.width = width;
this.height = height;
}
public int getLength(){
return (width+height)<<2;
}
public int getArea(){
return width*height;
}
public String getName(){
return "("+width+","+height+")";
}
public static <T> T findMax(T[] arr,Comparator<? super T> cmp){
if(null == arr || cmp == null){
return null;
}
int index = 0;
for (int i = 1; i < arr.length; i++) {
if(cmp.compare(arr[i], arr[index]) > 0){
index = i;
}
}
return arr[index];
}
/**
* 長度比較器
*/
public static class LengthCompare implements Comparator<RectangleTest>{
@Override
public int compare(RectangleTest o1, RectangleTest o2) {
if(o1.getLength() > o2.getLength()){return 1;}
else if (o1.getLength() == o2.getLength()) {
return 0;
}else{
return -1;
}
}
}
/**
* 面積比較器
*/
public static class AreaCompare implements Comparator<RectangleTest>{
@Override
public int compare(RectangleTest o1, RectangleTest o2) {
if(o1.getArea() > o2.getArea()) {return 1;}
else if (o1.getArea() == o2.getArea()) {
return 0;
}
else {
return -1;
}
}
}
public static void main(String[] args) {
RectangleTest[] arr = new RectangleTest[]
{new RectangleTest(5, 5),new RectangleTest(6,4),new RectangleTest(3, 8)};
System.out.println(findMax(arr, new LengthCompare()).getName());
System.out.println(findMax(arr, new AreaCompare()).getName());
}
}