1.编写一个Java程序,在程序中定义一个抽象类Shape,里面有一个求面积方法calArea, 用Java语言怎么编程
JAVA\u7f16\u7a0b\u8bed\u8a00\u662f\u9762\u5411\u5bf9\u8c61\u4e48\uff1fJava\u662f\u4e00\u95e8\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u8bed\u8a00\u3002
\u4e0d\u4ec5\u5438\u6536\u4e86C++\u8bed\u8a00\u7684\u5404\u79cd\u4f18\u70b9\uff0c\u8fd8\u6452\u5f03\u4e86C++\u91cc\u96be\u4ee5\u7406\u89e3\u7684\u591a\u7ee7\u627f\u3001\u6307\u9488\u7b49\u6982\u5ff5\uff0c\u56e0\u6b64Java\u8bed\u8a00\u5177\u6709\u529f\u80fd\u5f3a\u5927\u548c\u7b80\u5355\u6613\u7528\u4e24\u4e2a\u7279\u5f81\u3002
Java\u8bed\u8a00\u4f5c\u4e3a\u9759\u6001\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u8bed\u8a00\u7684\u4ee3\u8868\uff0c\u6781\u597d\u5730\u5b9e\u73b0\u4e86\u9762\u5411\u5bf9\u8c61\u7406\u8bba\uff0c\u5141\u8bb8\u7a0b\u5e8f\u5458\u4ee5\u4f18\u96c5\u7684\u601d\u7ef4\u65b9\u5f0f\u8fdb\u884c\u590d\u6742\u7684\u7f16\u7a0b \u3002
Java\u5177\u6709\uff1a
\u7b80\u5355\u6027
\u9762\u5411\u5bf9\u8c61
\u5206\u5e03\u5f0f
\u5065\u58ee\u6027
\u5b89\u5168\u6027
\u5e73\u53f0\u72ec\u7acb
\u53ef\u79fb\u690d\u6027
\u591a\u7ebf\u7a0b
\u52a8\u6001\u6027
Java\u53ef\u4ee5\u7f16\u5199\uff1a
\u684c\u9762\u5e94\u7528\u7a0b\u5e8f
Web\u5e94\u7528\u7a0b\u5e8f
\u5206\u5e03\u5f0f\u7cfb\u7edf
\u5d4c\u5165\u5f0f\u7cfb\u7edf\u5e94\u7528\u7a0b\u5e8f
\u4e0b\u8f7d\u4e2a
JDK
\u5b89\u88c5\u4e00\u4e0b\uff0c\u5728\u4e0b\u4e2a
NetBeans
6.0\u5b89\u88c5\u4e00\u4e0b
\u5c31\u53ef\u4ee5\u5728
NetBeans
\u4e2d
\u7f16\u5199\u4ee3\u7801\uff0c\u7f16\u5199\u5b8c\u540e
\u53f3\u952e\u70b9\u51fb\u8fd0\u884c
\u5c31\u80fd\u770b\u5230
\u7ed3\u679c\uff01\u8bb0\u5f97\u4e0d\u8981\u628a\u987a\u5e8f\u5f04\u9519\uff01
没啥大问题，既然返回是double那么输入就用double
还有记住每一个类一个java文件，不要放在一个java文件中！！！
Shape.java类
public abstract class Shape{
abstract double GetArea();
}Rectangle.java类
public class Rectangle extends Shape{
double a,b;
Rectangle(double a,double b){
this.a = a;
this.b = b;
}
@Override
double GetArea() {
return a*b;
}
}Test1.java类
import java.util.Scanner;
public class Test1{
public static void main(String[] args){
Scanner sca = new Scanner(System.in);
double aa = sca.nextDouble();
double b = sca.nextDouble();
Rectangle a = new Rectangle(aa,b);
System.out.println(a.GetArea());
}
}
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