}
public String toString(){
return name+\ } }
public class hc {
public static void main(String args[]){
student a=new student(\张三\网络工程\
System.out.println(\学生基本信息：\
teacher b=new teacher(\李四\教师\数信学院\
System.out.println(\教师信息：\
} }
六（3）circle类，求圆面积。
class Circle{
double r;
public Circle(double r){
this.r=r; }
public double area(){
return Math.PI*r*r; }
public static double area(double r){
return Math.PI*r*r; }
public static double area(Circle c){
return Math.PI*c.r*c.r; }
}
public class hc {
public static void main(String args[]){
Circle c1=new Circle(3);
System.out.println(c1.area());
System.out.println(Circle.area(3));
System.out.println(Circle.area(c1)); } }
六（4）复数类，测试两复数的加、乘、求模方法。
public class Hc {
private double x,y;
public Hc(double a,double b){ x=a; y=b; }
public String toString (){
return \ }
public Hc add(Hc a){