JAVA中三角形类Triangle如何实现
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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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