//練習題第五題
public?class?Circle{
???int?cPoint_x?;?//代表圓心橫坐標
???int?cPoint_y?;?//代表圓心縱坐標
???double?cRadius;//代表圓的半徑
???double?cPI?=?3.14;//代表圓的圓周率
???double?cArea?;//代表圓的面積
???Circle（）{
	???cPoint_x?=0;
	???cPoint_y?=?0;
	???cRadius?=1;
???}
???Circle?（?int??x??int??y?double???r）{
	???cPoint_x?=x;
	???cPoint_y?=y;
	???cRadius?=?r;
???}
????public??double??cAreaCount（）?{
????	cArea?=?cPI*cRadius*cRadius;
		return?cArea;
		}
????public?String?toString（）?{
????	System.out.println（“圓心為（“+cPoint_x+““+cPoint_y+“）半徑為“+cRadius+“的圓的面積為“+cArea）;
		return?null;
????	
????}
	public?static?void?main（String[]?args）?{
		Circle?c=?new?Circle（115）;
		c.cAreaCount（）;
		c.toString（）;

	}

}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2010-05-15?20:00??java機試題答案\
?????文件?????????768??2010-05-08?20:12??java機試題答案\Circle.java
?????文件???????37376??2010-05-05?16:50??java機試題答案\JAVA機試題.doc
?????文件?????????351??2010-05-07?20:15??java機試題答案\Lianxi_1.java
?????文件?????????560??2010-05-07?20:32??java機試題答案\Lianxi_2.java
?????文件?????????922??2010-05-10?16:42??java機試題答案\Lianxi_3.java
?????文件?????????314??2010-05-07?20:42??java機試題答案\Lianxi_4.java
?????文件?????????474??2010-05-08?18:14??java機試題答案\Lianxi_6.java
?????文件?????????686??2010-05-10?14:43??java機試題答案\Lianxi_7.java
?????文件?????????787??2010-05-10?15:15??java機試題答案\Lianxi_8.java
?????文件?????????418??2010-05-09?14:50??java機試題答案\Lianxi_9.java
?????文件?????????687??2010-05-10?12:29??java機試題答案\TestCopy.java
?????文件?????????570??2010-05-10?12:06??java機試題答案\TestRandom.java
?????文件?????????659??2010-05-10?11:25??java機試題答案\TestString.java