阅读以下说明和Java源程序,将应填入(n)处的字句写在对应栏内。【说明】以下程序能够计算三角形、矩形和正方形的周长并输出。程序由5个类组成:AreaTest是主类,类Triangle、Rectangle和Square分别表示三角形、矩形和正方形,抽象类Figure提供了一个计算周长的抽象方法。【程序】public class girthTest{public static void main (String args[]){Figure[]figures={new Triangle (2,3,3),new Rectangle(5,8),new Square(5)};for(int i=0;i<figures.length;i++){System.out.println(figures[i]+"girth="+figures[i].getGirth());}}}public abstract class Figure{public abstract double getGirth();}public class Rectangle extends (1) {double height;double width;public Rectangle(double height,double width){this.height=height;this.width=width;}public String toString(){return "Rectangle:height="+height+",width="+width+":";}public double getGirth(){return (2);}}public class Square extends (3) {public Square(double width){(4);}public Stdng toString(){return "Square:width='+width+":";}}public class Triangle extends (5) {double la;double lb;double lc;public Triangle(double la,double lb,double lc){this.la=la;this.lb=lb;this.lc=lc;}public String toString(){return "Triangle:sides=" +la+"," +lb+"," +lc+":";}public double getGirth(){return la+lab+lc;}}
阅读以下说明和Java源程序,将应填入(n)处的字句写在对应栏内。
【说明】
以下程序能够计算三角形、矩形和正方形的周长并输出。
程序由5个类组成:AreaTest是主类,类Triangle、Rectangle和Square分别表示三角形、矩形和正方形,抽象类Figure提供了一个计算周长的抽象方法。
【程序】
public class girthTest{
public static void main (String args[]){
Figure[]figures={
new Triangle (2,3,3),new Rectangle(5,8),new Square(5)
};
for(int i=0;i<figures.length;i++){
System.out.println(figures[i]+"girth="+figures[i].getGirth());
}
}
}
public abstract class Figure{
public abstract double getGirth();
}
public class Rectangle extends (1) {
double height;
double width;
public Rectangle(double height,double width){
this.height=height;
this.width=width;
}
public String toString(){
return "Rectangle:height="+height+",width="+width+":";
}
public double getGirth(){
return (2);
}
}
public class Square extends (3) {
public Square(double width){
(4);
}
public Stdng toString(){
return "Square:width='+width+":";
}
}
public class Triangle extends (5) {
double la;
double lb;
double lc;
public Triangle(double la,double lb,double lc){
this.la=la;this.lb=lb;this.lc=lc;
}
public String toString(){
return "Triangle:sides=" +la+"," +lb+"," +lc+":";
}
public double getGirth(){
return la+lab+lc;
}
}