public?abstract?class?Shape{
????public?abstract?void?inputInformation();
????public?abstract?void?perimeter();
????public?abstract?void?area();
}


import?java.util.Scanner;
public?class?Rectangle?extends?Shape{
????Scanner?input?=?new?Scanner(System.in);	
????public?void?inputInformation(){	
????????System.out.println("請輸入長度和寬度信息:?");
????}	
????public?void?area(){
????????double?a?=?input.nextDouble();
????????double?b?=?input.nextDouble();
????????System.out.println("長方形的面積:?"+(a*b));	
????}		
????public?void?perimeter(){
????????double?a?=?input.nextDouble();
????????double?b?=?input.nextDouble();
????????System.out.println("長方形的周長:?"+(2*a+2*b));
????}
}
??
??
import?java.util.Scanner;
public?class?Circle?extends?Shape?{
????Scanner?input??=?new?Scanner(System.in);
????public?void?inputInformation(){
?????????System.out.println("請輸入半徑長度信息:?");
????}	
????public?void?area(){
????????double?a?=?input.nextDouble();
????????System.out.println("圓形的面積為:?"+(Math.PI*a*a));
????}		
????public?void?perimeter(){		
????????double?a?=?input.nextDouble();		
????????System.out.println("圓形的周長為:?"+(Math.PI*a*2));	
????}
}
??
??
??
public?class?Initual{
????public?static?void?main(String[]?args){
????????System.out.println("***長方形***");
????????Shape?sh1?=?new?Rectangle();		
????????sh1.inputInformation();		
????????sh1.area();		
????????sh1.inputInformation();		
????????sh1.perimeter();		
????????System.out.println("----------------------------------------------------");		
????????System.out.println("***圓形***");		
????????Shape?sh2?=?new?Circle();		
????????sh2.inputInformation();		
????????sh2.area();		
????????sh2.inputInformation();		
????????sh2.perimeter();
????}
}