Question

java中声明三角形类,继承图像类,计算三角形的周长和面积,如何编程

Answer 1

请参考《Java程序设计教程》第202页实验4 第一题

Answer 2

class Shape {

void area(){}
void circle(){}
}

public class Triangle extends Shape{

float area(float i, float j){
return i*j/2;
}
float circle(float i, float j, float k){
return i+j+k;
}
public static void main(String[] args){
Triangle tr = new Triangle();
float ar = tr.area(1, 2);
System.out.println(ar);
float ci = tr.circle(1, 2, 3);
System.out.println(ci);
}