JAVA 三角形类Triangle（GeometricObject继承）
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package triangletest;
import java.util.*;
public class TriangleTest{
public static void main(String args[]){
Scanner ss=new Scanner(System.in);
System.out.println("please input there sides and color of triangle ");
double a=ss.nextDouble();
double b=ss.nextDouble();
double c=ss.nextDouble();
String co=ss.nextLine();
System.out.println("please input a boolean date to indicate this object if be filled");
boolean k=ss.nextBoolean();
Triangle cs=new Triangle(a,b,c);
cs.setColor(co);
cs.setFilled(k);
System.out.println(cs.toString());
System.out.println("the area = "+cs.getArea());
System.out.println("the Perimeter = "+cs.getPerimeter());
System.out.println("the object filled is "+cs.isFilled());
}
}
class Triangle extends GeometricObject{
double side1=1.0;
double side2=1.0;
double side3=1.0;
public Triangle(){};
public Triangle(double side1,double side2,double side3){
this.side1=side1;
this.side2=side2;
this.side3=side3;
}
public double getSide1(){
return side1;
}
public double getSide2(){
return side2;
}
public double getSide3(){
return side3;
}
public double getArea(){
double s=(side1+side2+side3)/2;
return Math.sqrt(s*(s-side1)*(s-side1)*(s-side1));
}
public double getPerimeter(){
return side1+side2+side3;
}
public String toString(){
return "Triangle: side1= "+side1+"\nside2= "+side2+"\nside3= "+side3;
}
}
class GeometricObject{
private String color;
private boolean filled;
private java.util.Date dateCreated;
public GeometricObject(){};
public GeometricObject(String color,boolean filled){
this.color=color;
this.filled=filled;
}
public String getColor(){
return color;
}
public void setColor(String color){
this.color=color;
}
public boolean isFilled(){
return filled;
}
public void setFilled(boolean filled){
this.filled=filled;
}
public java.util.Date getDateCreated(){
return dateCreated;
}
public String toString(){
return "this object‘s color is "+color+"\nthis object filled "+filled;
}
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