Java课后题——（三角形类）设计一个名为triangle的类来扩展geometricobject类，该类包括

左手的ㄟ右手 2022-01-27 01:51 328阅读 0赞

设计一个名为triangle的类来扩展geometricobject类，该类包括

*  三个名为side1,side2,side3的double数据域表示这个三角形的三条边
 *  一个无参构造方法创建默认三角形
 *  一个能创建带指定size的三角形构造方法
 *  所有三个数据域的访问器
 *  是否填充
 *  面积，周长，颜色
    
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    GeometricObject类如下：
    
        abstract class GeometricObject{
        
        	private boolean filled;
        	private String color;
        	private java.util.Date dateCreated;
        
        	protected GeometricObject() {
        		this(false,"white");
        		dateCreated = new java.util.Date();
        	}
        
        	protected GeometricObject(boolean filled, String color) {
        		//super();
        		this.filled = filled;
        		this.color = color;
        		dateCreated = new java.util.Date();
        	}
        
        	public boolean isFilled() {
        		return filled;
        	}
        
        	public void setFilled(boolean filled) {
        		this.filled = filled;
        	}
        
        	public String getColor() {
        		return color;
        	}
        
        	public void setColor(String color) {
        		this.color = color;
        	}
        
        	public java.util.Date getDateCreated() {
        		return dateCreated;
        	}
        
        	public void setDateCreated(java.util.Date dateCreated) {
        		this.dateCreated = dateCreated;
        	}
        
        	@Override
        	public String toString() {
        		return "created on"+dateCreated+"\ncolor"+color+"and filled:"+filled;
        	}
        
        	public abstract double getArea();
        
        	public abstract double getPerimater();
        }
    
    Triangle类如下：
 *      public class TriangleFromGeometricObject extends GeometricObject{
        
        	private double side1;
        	private double side2;
        	private double side3;
        	
        	public TriangleFromGeometricObject() {
        		super();
        	}
        	
        	public TriangleFromGeometricObject(boolean filled, String color,double side1,double side2,double side3) {
        		super(filled, color);
        		this.side1 = side1;
        		this.side2 = side2;
        		this.side3 = side3;
        	}
        
        	public double getSide1() {
        		return side1;
        	}
        
        	public void setSide1(double side1) {
        		this.side1 = side1;
        	}
        
        	public double getSide2() {
        		return side2;
        	}
        
        	public void setSide2(double side2) {
        		this.side2 = side2;
        	}
        
        	public double getSide3() {
        		return side3;
        	}
        
        	public void setSide3(double side3) {
        		this.side3 = side3;
        	}
        
        	@Override
        	public double getArea() {
        		double area = Math.sqrt((getPerimater()/2)*(getPerimater()/2-side1)*(getPerimater()/2-side2)*(getPerimater()/2-side3));
        		return area;
        	}
        
        	@Override
        	public double getPerimater() {
        		return side1 + side2 + side3;
        	}
        
        	@Override
        	public String toString() {
        		return "TriangleFromGeometricObject [side1=" + side1 + ", side2=" + side2 + ", side3=" + side3 + ", toString()="
        				+ super.toString() + "]";
        	}
        }
    
     
 *  测试类：
 *      public class TriangleCombine {
        
        	public static void main(String[] args) {
        		
        		java.util.Scanner input = new java.util.Scanner(System.in);
        		
        		System.out.println("请输入是否填充：");
        		boolean filled = input.nextBoolean();
        		
        		System.out.println("请输入颜色：");
        		String colorFFF = input.nextLine();
        		String color = input.nextLine();
        		
        		System.out.println("请输入三角形的三条边：");
        		double side1 = input.nextDouble();
        		double side2 = input.nextDouble();
        		double side3 = input.nextDouble();
        		
        		GeometricObject triangle = new TriangleFromGeometricObject(filled,color,side1,side2,side3);
        	
        		System.out.println("filled="+triangle.isFilled());
        		System.out.println("color="+triangle.getColor());
        		System.out.println("dateCrated="+triangle.getDateCreated());
        		System.out.println("side1="+side1+"\nside2="+side2+"\nside3="+side3);
        		System.out.println("getArea="+triangle.getArea());
        		System.out.println("getPerimater="+triangle.getPerimater());
        		System.out.println("toString="+triangle.toString());
        	
        	
        	
        	}
        
        }
    
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    java初学者，若有不足请大家指出！谢谢！