//這是無參的
package?com.LEE;
?
public?abstract?class?Shape?{
public?abstract?void?perimeter();
public?abstract?void?area();
}
//************************************************
package?com.LEE;
?
public?class?Rectangle?extends?Shape?{
int?a=1,b=2;
@Override
public?void?perimeter()?{
//?TODO?Auto-generated?method?stub
System.out.println("矩形周長為"+2*(a+b));
}
?
@Override
public?void?area()?{
//?TODO?Auto-generated?method?stub
System.out.println("矩形面積為"+a*b);
}
?
}
//*************************************************
package?com.LEE;
?
public?class?Circle?extends?Shape?{
int?r=2;
@Override
public?void?perimeter()?{
//?TODO?Auto-generated?method?stub
System.out.println("圓形周長是"+(2*3.14*r));
}
?
@Override
public?void?area()?{
//?TODO?Auto-generated?method?stub
System.out.println("圓形面積是"+(3.14*r*r));
}
?
}
//****************************************************
package?com.LEE;
?
public?class?Initial?{
public?static?void?main(String[]?args){
Shape?Rec=new?Rectangle();
Shape?Cir=new?Circle();
Rec.perimeter();
Rec.area();
Cir.perimeter();
Cir.area();
}
}
2015-04-28
package com.imooc;
public abstract class Shape {
?public abstract void area(double r);
?public abstract void area(double a,double b);
?public abstract void perimeter(double r);
?public abstract void perimeter(double a,double b);
}
package com.imooc;
public class Circle extends Shape {
?@Override
?public void area(double r) {
??// TODO Auto-generated method stub
??System.out.println("圓的面積是："+3.14*3.14*r);
?}
?@Override
?public void area(double a, double b) {
??// TODO Auto-generated method stub
?}
?@Override
?public void perimeter(double r) {
??// TODO Auto-generated method stub
??System.out.println("圓的周長是："+2*3.14*r);
?}
?@Override
?public void perimeter(double a, double b) {
??// TODO Auto-generated method stub
?}
}
package com.imooc;
public class Rectangle extends Shape {
?@Override
?public void area(double r) {
??// TODO Auto-generated method stub
?}
?@Override
?public void area(double a, double b) {
??// TODO Auto-generated method stub
??System.out.println("矩形的面積是："+a*b);
?}
?@Override
?public void perimeter(double r) {
??// TODO Auto-generated method stub
?}
?@Override
?public void perimeter(double a, double b) {
??// TODO Auto-generated method stub
??System.out.println("矩形的周長是："+2*(a+b));
?}
}
package com.imooc;
public class Initial {
?/**
? * @param args
? */
?public static void main(String[] args) {
??// TODO Auto-generated method stub
??Shape cir=new Circle();
??Shape rec=new Rectangle();
??cir.area(3.0);
??cir.perimeter(3.0);
??rec.area(2, 3);
??rec.perimeter(2, 3);
?}
}
2015-04-20
能文不武寫的是錯的
2015-03-09
//父類抽象方法和子類方法實現，唯一的區別就是，父類抽象方法中{}是空的，哈哈O(∩_∩)O哈哈~ package?com.LEE; ?? public?abstract?class?Shape?{????????//在父類方法中，所帶的參數都是在（）里面聲明的 public?abstract?void?perimeter(int?a,int?b);? public?abstract?void?area(int?r);? } //************************************************ package?com.LEE; ?? public?class?Rectangle?extends?Shape?{ //int?a=1,b=2; //同樣，因為你這個方法已經是帶參數的了，所以在方法里面就不需要定義變量的值了這個步驟應該放到main方法里面去做 @Override public?void?perimeter(int?a,?int?b)?{ //?TODO?Auto-generated?method?stub System.out.println("矩形周長為"+2*(a+b)); } ?? @Override public?void?area(int?a,?int?b)?{ //?TODO?Auto-generated?method?stub System.out.println("矩形面積為"+a*b); } ?? } //************************************************* package?com.LEE; ?? public?class?Circle?extends?Shape?{ //int?r=2; @Override public?void?perimeter(int?r)?{ //?TODO?Auto-generated?method?stub System.out.println("圓形周長是"+(2*3.14*r)); } ?? @Override public?void?area(int?r)?{ //?TODO?Auto-generated?method?stub System.out.println("圓形面積是"+(3.14*r*r)); } ?? } //**************************************************** package?com.LEE; ?? public?class?Initial?{ public?static?void?main(String[]?args){ Shape?Rec=new?Rectangle(); Shape?Cir=new?Circle(); //我們可以在這里定義具體參數的值 int?a=1,b=2 Rec.perimeter(a,b); Rec.area(a,b); int?r=2 Cir.perimeter(r); Cir.area(r); } ? }