java类对象的继承以及使用

import java.awt.Point;


abstract class Shape{
abstract void draw();
Point position;
void Shape (Point p){
position = p;
}
}


abstract class Round extends Shape{
final double pi = 3.14159265;
abstract void draw();
abstract double area();
void Round(){ //此处必须写构造函数，并且与父类类型一致，下同
}
}


class Circle extends Round{
int radius;
void draw(){
// drawCircle(position);
}
double area(){
return pi*radius*radius;
}
void Circle(Point p, int raduis){//同上
// super(p);
this.radius = radius;
}
} 

 

 

 

import java.awt.*;

public final class ClassJava{
 public static void main(String[] args){
  int x = StaticVar.number;
  System.out.println("Static:number = " + x);
  
  Customer customer1 = new Customer();
  Customer customer2 = new Customer();

  customer1.setName("Zhang Feng");
  customer1.setAddress("# 130 Nan Road");
  customer1.setTelephone("027-84338585");
  
  customer2.setName("Jin Wei");
  customer2.setAddress("# 130 Bei Road");
  customer2.setTelephone("010-84338585");
  
  System.out.print("The first customer name: ");
  System.out.println(customer1.name);
  System.out.print("The first customer address: ");
  System.out.println(customer1.address);
  System.out.print("The first customer telephone: ");
  System.out.println(customer1.telephone);

  System.out.print("The second customer name: ");
  System.out.println(customer2.name);
  System.out.print("The second customer address: ");
  System.out.println(customer2.address);
  System.out.print("The second customer telephone: ");
  System.out.println(customer2.telephone);
 }
}