[Java]_ch11.2_跨Package存取

[Java]_ch11.2_跨Package存取
package Taipei;
public class CCircle{
protected double pi=3.14;
protected double radius;
public CCircle(){
radius=1.0;
System.out.println("0.父類別建構元(), pi="+pi+" radius="+radius);
}
public CCircle(double r){
radius=r;
System.out.println("1.父類別建構元(double r), pi="+pi+" radius="+radius);
}
public final void show(){
System.out.println("父類別show(), pi="+pi+" radius="+radius+" area="+pi*radius*radius);
}
public void setValue(int v){}
}


package Hsinchu;
public class CCoin extends Taipei.CCircle{
int value;
public CCoin(){
super(4.0);
value=5;
System.out.println("0.子類別建構元(), pi="+pi+" radius="+radius+" value="+value);
}
public CCoin(double v){
value=(int)v;
System.out.println("1.子類別建構元(double v), pi="+pi+" radius="+radius+" value="+value);
}
public void setValue(int v){
value=v;
System.out.println("子類別setValue(), value="+value+" pi="+pi+" radius="+radius);
}
// public void show(){
// System.out.println("子類別show(), pi="+pi+" radius="+radius+" area="+pi*radius*radius+" value="+value);
// }
}


package Gjun;
public class A9 {

public static void main(String[] args) {
Taipei.CCircle c1=new Taipei.CCircle(2.0);
c1.show();
// c1.setValue(50);
Hsinchu.CCoin c2=new Hsinchu.CCoin();
c2.setValue(100);
c2.show();
Taipei.CCircle c3=new Hsinchu.CCoin(99);
c3.show();
c3.setValue(88);
}

}