java程式改寫

Question

我想把這程式，利用迴圈讓使用者可自鍵盤輸入n組的正方形或長方形的長，寛資料，把這些四邊形的資料存在陣列中，最後找出這些四邊形中的最大面積；列印這些四邊形的長，寛及它的形狀（標示正方形或長方形）及最大面積值，請問該如何著手呢?


class Quad
{ 

     private int length;
     private int width;
     private int area;
     private int total;

     public void Quad(int w){ this.width=w;}
     public void Rectangle(int w,int l){ this.width=w;this.length=l;}

     public int getlength() { return length ;}
     public int getwidth() { return width ;}
     public int getarea() {return area;}
     public int gettotal() {return total;}

     public int computerareaQ(){ return area=width*width;
                         }
     public int computerareaR(){ return area=length*width;
                         }

     public int computertotalR(){ return total=2*(length+width);
                         }
     public int computertotalQ(){ return total=2*(width);
                         }
   
}


public class TestQuad
{     public static void main(String[] args)
    
          Quad b = new Quad();
          b.Quad(4);
          System.out.println("邊長=4");   
          b.computerareaQ();               
          System.out.println("正方形面積="+b.getarea());
          b.computertotalQ();          
          System.out.println("正方形邊長="+b.gettotal());          

          Quad a = new Quad();
          a.Rectangle(4,5);          
          System.out.println("長=5,寬=4");
          a.computerareaR();
          System.out.println("長方形面積="+a.getarea());
          a.computertotalR();
          System.out.println("長方形邊長="+a.gettotal());

          
          }
          
}

Ashley · Accepted Answer

import java.util.Scanner;
class Quad {
   private int length;
   private int width;
   private int area;
   private int total;
   public void Quad(int w){ this.width = w; this.length = -1; }
   public void Rectangle(int w,int l){ this.width = w; this.length = l; }
   public int getlength() { return length ;}
   public int getwidth() { return width ;}
   public int getarea() {return area;}
   public int gettotal() {return total;}
   public int computerareaQ(){ return area = width * width; }
   public int computerareaR(){ return area = length * width; }
   public int computertotalR(){ return total = 2 * (length + width); }
   public int computertotalQ(){ return total = 4 * (width); }
}
public class TestQuad { 
   public static void main(String[] args) {
      Scanner p = new Scanner(System.in);
      System.out.print("請輸入 n："); int n = p.nextInt();
      int ans, w, l, i, max = -1, area;
      Quad a[] = new Quad[n];
      for( i = 0; i < n; i++ ){
         System.out.println("請輸入1.正方形 2.長方形（1/2）：");
         ans = p.nextInt();
         if( ans == 1 ){
            a[i] = new Quad();
            System.out.println("請輸入正方形邊長"); w = p.nextInt();
            a[i].Quad(w);
            a[i].computerareaQ();
            a[i].computertotalQ();
         } else {
            a[i] = new Quad();
            System.out.println("請輸入長方形的長"); l = p.nextInt();
            System.out.println("請輸入長方形的寬"); w = p.nextInt();
            a[i].Rectangle(w,l);
            a[i].computerareaR();
            a[i].computertotalR();
         }
         area = a[i].getarea();
         if( max == -1 || area > a[max].getarea() )
             max = i;
      }
      System.out.println("輸入四邊形中最大面積為：");
      if( a[max].getlength() == -1 ) 
         System.out.println("正方形");
      else {
         System.out.println("長方形");
         System.out.println("長：" + a[max].getlength() );
      }
      System.out.println("寬：" + a[max].getwidth() );
      System.out.println("面積：" + a[max].getarea() );
   }
}

ΨετμουνΤ · Answer

請參考我的做法

import java.io.*;
import java.util.*;

public class Rect implements Comparable<Rect>{
 boolean isSquare = false;
 int l, w;

public Rect(int x) {
  isSquare = true;
  l = x; w = x;
 }

public Rect(int x, int y) {
  l = x; w = y;
 }

public int area() {
  return l * w;
 }

public int compareTo(Rect r) {
  return area() - r.area();
 }

public String toString() {
  if (isSquare) return "正方形: 邊長 " + l;
  return "長方形: 長 " + l + ", 寬 " + w;
 }

public static void main(String[] args) throws Exception {
  System.out.print("請輸入n: ");
  BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
  int n = Integer.parseInt(br.readLine());
  Rect[] ary = new Rect[n];
  for (int i = 0; i < n; i++) {
   System.out.print("請輸入正方形的邊長或長方形的長與寬: ");
   String s = br.readLine();
   String[] ary2 = s.split("[ ,]");
   if (ary2.length == 1) ary[i] = new Rect(Integer.parseInt(ary2[0]));
   else ary[i] = new Rect(Integer.parseInt(ary2[0]), Integer.parseInt(ary2[1]));
  }

for (Rect r : ary) {
   System.out.println(r);
  }

Arrays.sort(ary);
  System.out.println("最大面積為 " + ary[ary.length-1].area());
 }
}

java程式改寫

2 個解答