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                        /Java入門第二季 升級版

求更簡潔的代碼

package?Chapter5;
import?java.util.Scanner;
abstract?class?Shape1{
	public?abstract?void?Sum();	
	public?abstract?void?Area();
	}?
class?Rectang?extends?Shape1{	?
?????double?width;	??
?????double?length;	??
?public?Rectang(){		?
??	??}	
?public?Rectang(double?width,double?length){	
?	??this.width=width;	
?	??this.length=length;	?
?	???}	???
?public??void?Sum(){	????	
???????double?sum=2*(width+length);	????
???????System.out.println("長方形周長為："+sum);	
???????????}		
?public??void?Area(){			
???????double?sum=width*length;			
???????System.out.println("長方形面積為："+sum);		
???????}?
???}?
class?Circle?extends?Shape1{	?
??????double?radius;	?
??????public?Circle(){		??
??????	??}	?
??????public?Circle(double?radius){	
??????	??this.radius=radius;		??
??????	??}	???
??????public??void?Sum(){	???
???????	double?sum=Math.PI*2*radius;	????
????????System.out.println("圓的周長為："+sum);	??
??????????}		
??????public??void?Area(){		
?????	double?sum=Math.PI*radius*radius;		
????????System.out.println("圓的面積為："+sum);		
????????}
????????}
????public?class?Shape_1?{	
?????????public?static?void?main(String[]?args)?{		
?????????//?TODO?Auto-generated?method?stub		
?????????boolean?dd=true;???????
?????????Scanner?in=new?Scanner(System.in);??????
??????????while(dd){???????
???????????System.out.println("請選擇你要計算的圖形：1--長方形,2--圓:");????
???????????int?s=in.nextInt();??????
???????????if(s==1){????	???
???????????System.out.println("請輸入長方形的寬：");????	
???????????int?aa=in.nextInt();????	???
???????????System.out.println("請輸入長方形的長：");????	??
???????????int?ss=in.nextInt();????	??
???????????Shape1?sh;????	??
???????????sh=new?Rectang(aa,ss);????	?
?????????????sh.Sum();????	???
?????????????sh.Area();????	???
?????????????dd=false;???????
?????????????}
???????????else?if(s==2){????	??
???????????System.out.println("請輸入圓的半徑：");????
???????????int?aa=in.nextInt();????	???
???????????Shape1?sh;????	???
???????????sh=new?Circle(aa);????	???
???????????sh.Sum();????	???
???????????sh.Area();????	???
???????????dd=false;???????
???????????}else{????	??
???????????System.out.println("你輸入的有誤請重新輸入");?????	??
???????????dd=true;???????
???????????}???????
??????????}	
?????????}
?????}

學飛奮斗的小鳥

2019-07-17

源自：Java入門第二季升級版 10-3

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3 回答

光頭璨回答被采納 +2 積分
2019-07-18

差不多很簡潔了

0 回復有任何疑惑可以回復我~

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寤悟勿真
2019-07-29

public?class?Circle?extends?Shape?{
?private?double?radius;
?public?Circle(double?r){
??this.radius?=?r;
?}?
?
?public?double?Area()?{
??//?TODO?Auto-generated?method?stub
??return?Math.PI*radius*radius;
?}?public?double?Perimeter()?{??//?TODO?Auto-generated?method?stub??return?Math.PI*2*radius;?}
?}
public?class?Test?{
?public?static?void?main(String[]?args)?{
??Scanner?input?=?new?Scanner(System.in);
??int?a?=?input.nextInt();
??
??if(a==1||a==2){
???System.out.println("1***長方形；2***圓形");
???if(a==1){
????System.out.println("請輸入長方形的長：");
????int?c?=?input.nextInt();
????System.out.println("請輸入長方形的寬：");
????int?w?=?input.nextInt();
????Rectangle?rectangle?=?new?Rectangle(c,w);
????System.out.println("長方形1形面積："+rectangle.Area()+"矩形周長："+rectangle.Perimeter());
???}else?if(a==2){
????System.out.println("請輸入圓形的半徑：");
????int??r?=?input.nextInt();
????Shape?circle?=?new?Circle(r);
????System.out.println("圓形面積："+circle.Area()+"圓形周長："+circle.Perimeter());
???}
???
??}else{
???System.out.println("您的輸入有誤");
???
??}
?}
}