代码块
class Circle{
static double pi=3.14;
static int objectNO=0;
int radius;
Circle(int r){ //构造方法
radius =r;
objectNO++;
}
Circle(){ //构造方法
radius=2;
objectNO++;
}
double getArea(){
return pi*radius*radius;
}
static void setPI(double p){
pi=p;
}
void setRadius(int r){
radius=r;
}
static void displayNO(){
System.out.println("当前圆对象个数是:"+objectNO);
}
}
public class StaticTest {
public static void main(String args[]){
Circle cir1=new Circle(5);
System.out.println("cir1圆周率是："+cir1.pi);
System.out.println("cir1的半径是:"+cir1.radius);
System.out.println("cir1的面积是:"+cir1.getArea());
cir1.displayNO();
cir1 .setRadius(10);
Circle cir2=new Circle();
cir2.setPI(3.1415);
System.out.println("cir1圆周率是："+cir1.pi);
System.out.println("cir1的半径是:"+cir1.radius);
System.out.println("cir2的半径是:"+cir2.radius);
System.out.println("cir2的面积是:"+cir2.getArea());
cir2.displayNO();
Circle []cirs=new Circle[5];
for(int i=0;i<cirs.length;i++){
cirs[i]=new Circle();
cirs[i].displayNO();
}
}
}
运行结果
