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                        /Java入門第二季 升級版

請求大神幫忙看一下，錯誤有好多

public abstract class ?shape{

? ?public abstract double ?C();

? ?public abstract double ?S();}

public class Rectaugle extands shape {

? ?double a=4.5,b=2.1;

? public double ?Rectaugle (){

? double a=4.5;

? double b=2.1;

? ?double ? C=(a+b)*2;

? double ?S=a*b;

? return C;

? return S;

System.out.println("矩形周長為"+C);

?System.out.println("面積為"+S);

? ?}}

public class Circle extands shape ?{

? public double Circle (）{

? final double p=3.14;

? double r=2.1;

? ? double ?C=2*p*r;

? double ? ?s=p*r*r;

? return C;

? return S;

?System.out.println("圓形周長為"+C);

System.out.println("面積是"+S);}

}}

public class Hello{

?public static void main (String [] args){

?shape s1=new Rectaugle();

?shape s2=new Circle();

?s1.Rectaugle();

?s2.Circle();}

}

慕粉2110022127

2017-05-21

源自：Java入門第二季升級版 10-3

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Cr4 回答被采納 +3 積分
2017-05-21

public?class?JS{
	?public?static?void?main?(String?[]?args){
	?shape?s1=new?Rectaugle();
	?shape?s2=new?Circle();
	?System.out.println("矩形的長"+s1.C()+"?"+"矩形的面積"+s1.S());
	?System.out.println("");
	?System.out.println("圓形的長"+s2.C()+"?"+"圓形的面積"+s2.S());
	?}
	}??????//Java.JS??主類??（各個類分開來寫）
	
public?abstract?class?shape{
??????public?abstract?double?C();
	??public?abstract?double?S();
	???}???//Java.shape?抽象類

public?class?Rectaugle?extends?shape{
	??double?a=4.5;
	??double?b=2.1;
	??double?c=(a+b)*2;
	??double?s=a*b;
	??public?double?C(){
	??return?c;//長度
	??}
	?public?double?S()?{
		return?s;//面積
	????????}
	??}?????????????//Java.Rectaugle??（子類--矩形類）
	???	
?public?class?Circle?extends?shape{
	??double?p=3.14;
	??double?r=2.1;
	??double??c=2*p*r;
	??double???s=p*r*r;
	??public?double?C(){
??????????return?c;//長度???
	?}
	public?double?S()?{
		return?s;//面積
	????}
	}??????????????//Java.Circle?（子類--圓形類）

輸出的答案：? ? ? 矩形的長13.2 ? 矩形的面積9.450000000000001

? ? ? ? ? ? ? ? ? ? ? ? ? ? ?圓形的長13.188 ?圓形的面積13.8474