java大题(6)

}

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){

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