2.6testfinal.java

JAVA程序设计的源代码

public class TestFinal {
public static void main(String args[]){
final double PI = 3.1415926;    //定义常量PI表示圆周率
double r = 4.0;
double s = PI*r*r;    //计算圆的面积
System.out.println("the square of the circle is: "+s);
}
}