新手求大神帮忙解决问题了

Game-Over 2014-10-15 10:40:24 
Circle c1 = new Circle(1, "BLUE", true);

Circle c2 = new Circle(2, "BLUE", true);

Circle c3 = new Circle(3, "BLUE", false);

Circle c4 = new Circle(4, "BLACK", true);

System.out.println( "c1 ? c1 " + c1.compareTo(c1) );

System.out.println( "c1 ? c2 " + c1.compareTo(c2) );

System.out.println( "c1 ? c3 " + c1.compareTo(c3) );

System.out.println( "c1 ? c4 " + c1.compareTo(c4) );

Rectangle r1 = new Rectangle(1,1,"BLUE", true);

Rectangle r2 = new Rectangle(2,2,"RED", true);

Rectangle r3 = new Rectangle(4,4,"GREEN", false);

Rectangle r4 = new Rectangle(4,4,"GREEN", true);

System.out.println( "r1 ? r2 " + r1.compareTo(r2) );

System.out.println( "r1 ? r2 " + r1.compareTo(r2) );

System.out.println( "c1 ? r2 " + c1.compareTo(r2) );

System.out.println( "r3 ? r4 " + r3.compareTo(r4) );

用上面的代码来运行出来 这个
c1 ? c1 0
c1 ? c2 -1
c1 ? c3 -1
c1 ? c4 1
r1 ? r2 -1
r1 ? r2 -1
c1 ? r2 1
r3 ? r4 -1


我写了一些，但是怎么都搞不出来，求救。。。。
代码在下面
public abstract class GeometricObject implements Comparable<GeometricObject> {

private String color = "white";

private boolean filled;

private java.util.Date dateCreated;



protected GeometricObject(){

    dateCreated = new java.util.Date();

}



protected GeometricObject(String color, boolean filled){

    dateCreated = new java.util.Date();

    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 "Created on " + dateCreated + "\ncolor: " + color + 

            "and filled: " + filled;

}



public static void main(String[] args)  {

   	

Circle1 c1 = new Circle1(1, "BLUE", true);

Circle1 c2 = new Circle1(2, "BLUE", true);

Circle1 c3 = new Circle1(3, "BLUE", false);

Circle1 c4 = new Circle1(4, "BLACK", true);

System.out.println( "c1 ? c1 " + c1.compareTo(c1) );

System.out.println( "c1 ? c2 " + c1.compareTo(c2) );

System.out.println( "c1 ? c3 " + c1.compareTo(c3) );

System.out.println( "c1 ? c4 " + c1.compareTo(c4) );

Rectangle r1 = new Rectangle(1,1,"BLUE", true);

Rectangle r2 = new Rectangle(2,2,"RED", true);

Rectangle r3 = new Rectangle(4,4,"GREEN", false);

Rectangle r4 = new Rectangle(4,4,"GREEN", true);

System.out.println( "r1 ? r2 " + r1.compareTo(r2) );

System.out.println( "r1 ? r2 " + r1.compareTo(r2) );

System.out.println( "c1 ? r2 " + c1.compareTo(r2) );

System.out.println( "r3 ? r4 " + r3.compareTo(r4) );



}

public static GeometricObject max (GeometricObject o1, GeometricObject o2){

    if (((Comparable)o1).compareTo(o2) > 0 )

         return o1;

    else

         return o2;

}







    	



		private String compareTo(Circle1 c3) {

			// TODO Auto-generated method stub

			return null;

		}



		private String compareTo(Rectangle r2) {

			// TODO Auto-generated method stub

			return null;

		}



		@Override

		public int compareTo(Object o) {

			// TODO Auto-generated method stub

			return 0;

		}}




public class Rectangle extends GeometricObject implements Comparable{

    private double width;

    private double height;



    public Rectangle() {

    }



    public Rectangle(double Width, double Height){

        this.width = Width;

        this.height = Height;

    }



    public Rectangle(double Width, double Height, String Color, boolean Filled){

        this.width = Width;

        this.height = Height;

        setColor(Color);

        setFilled(Filled);

    }



    public double getWidth(){

        return width;

    }



    public double getHeight(){

        return height;

    }



    public void setHeight(double Height){

        this.height = Height;

    }



    public double getArea(){

        return width * height;

    }



    public double getPerimeter(){

        return 2 * (width + height);

    }}


class Circle1 extends GeometricObject implements Comparable<> {

    private double radius;



    public Circle1() {

    }



    public Circle1(double radius){

        this.radius = radius;

    }



    public Circle1(double radius, String color, boolean filled){

        this.radius = radius;

        setColor(color);

        setFilled(filled);

    }



    public double getRadius(){

        return radius;

    }



    public void setRadius(double radius){

        this.radius = radius;

    }



    public double getArea(){

        return radius * radius * Math.PI;

    }



    public double getDiameter(){

        return 2 * radius;

    }



    public double getPerimeter(){

        return 2 * radius * Math.PI;

    }



    public void printCircle() {

        System.out.println("The circle is created " + getDateCreated() +

            " and the radius is " + radius);

    }



	@Override

	public int compareTo(Object o) {

		// TODO Auto-generated method stub

		return 0;

	}}


求各位大神帮忙改改写写解决下，谢谢了。。。
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littlebrain4solving 2014-10-15
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你的Circle与Rectangle都要实现compareTo方法 @Override public int compareTo(Object o) {         Circle c = (Circle)o;         return this.getColor().compareTo(c.getColor()); }} @Override public int compareTo(Object o) {         Rectangle r = (Rectangle )o; if(r.width == this.width && r.height == this.height){ return 0; } if(this.width < r.width && this.height < r.height){ return -1; }         return 1; }}   
Game-Over 2014-10-15
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引用 3 楼 wojiaolinaaa 的回复:
c1 ? c1 0谁知道这是什么。你要达到什么效果
大哥，用这个
Circle c1 = new Circle(1, "BLUE", true);
Circle c2 = new Circle(2, "BLUE", true);
Circle c3 = new Circle(3, "BLUE", false);
Circle c4 = new Circle(4, "BLACK", true);
System.out.println( "c1 ? c1 " + c1.compareTo(c1) );
System.out.println( "c1 ? c2 " + c1.compareTo(c2) );
System.out.println( "c1 ? c3 " + c1.compareTo(c3) );
System.out.println( "c1 ? c4 " + c1.compareTo(c4) );
Rectangle r1 = new Rectangle(1,1,"BLUE", true);
Rectangle r2 = new Rectangle(2,2,"RED", true);
Rectangle r3 = new Rectangle(4,4,"GREEN", false);
Rectangle r4 = new Rectangle(4,4,"GREEN", true);
System.out.println( "r1 ? r2 " + r1.compareTo(r2) );
System.out.println( "r1 ? r2 " + r1.compareTo(r2) );
System.out.println( "c1 ? r2 " + c1.compareTo(r2) );
System.out.println( "r3 ? r4 " + r3.compareTo(r4) );
去算出c1比c1 以此类推，然后得出 c1 ? c2 -1 c1 ? c3 -1 c1 ? c4 1 r1 ? r2 -1 r1 ? r2 -1 c1 ? r2 1 r3 ? r4 -1
_浪子 2014-10-15
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c1 ? c1 0谁知道这是什么。你要达到什么效果
Game-Over 2014-10-15
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引用 1 楼 wojiaolinaaa 的回复:
你要做什么都没说怎么改
大神。。。我已经在开头写了，就是用最开始的那个代码去运行出来 c1 ? c1 0 c1 ? c2 -1 c1 ? c3 -1 c1 ? c4 1 r1 ? r2 -1 r1 ? r2 -1 c1 ? r2 1 r3 ? r4 -1 而且要用到GeometricObject， circle1， 和rectangle。。。 谢谢啦！
_浪子 2014-10-15
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你要做什么都没说怎么改
coffee-time 2014-10-15
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全都帮你改了下 

class Circle extends GeometricObject {
	private double radius;

	public Circle() {
	}

	public Circle(double radius) {
		this.radius = radius;
	}

	public Circle(double radius, String color, boolean filled) {
		this.radius = radius;
		setColor(color);
		setFilled(filled);
	}

	public double getRadius() {
		return radius;
	}

	public void setRadius(double radius) {
		this.radius = radius;
	}

	public double getArea() {
		return radius * radius * Math.PI;
	}

	public double getDiameter() {
		return 2 * radius;
	}

	public double getPerimeter() {
		return 2 * radius * Math.PI;
	}

	public void printCircle() {
		System.out.println("The circle is created " + getDateCreated()
				+ " and the radius is " + radius);
	}
}


public class Rectangle extends GeometricObject {
	private double width;
	private double height;

	public Rectangle() {
	}

	public Rectangle(double Width, double Height) {
		this.width = Width;
		this.height = Height;
	}

	public Rectangle(double Width, double Height, String Color, boolean Filled) {
		this.width = Width;
		this.height = Height;
		setColor(Color);
		setFilled(Filled);
	}

	public double getWidth() {
		return width;
	}

	public double getHeight() {
		return height;
	}

	public void setHeight(double Height) {
		this.height = Height;
	}

	public double getArea() {
		return width * height;
	}

	public double getPerimeter() {
		return 2 * (width + height);
	}
}


public abstract class GeometricObject implements Comparable<GeometricObject> {
	private String color = "white";
	private boolean filled;
	private java.util.Date dateCreated;

	protected GeometricObject() {
		dateCreated = new java.util.Date();
	}

	protected GeometricObject(String color, boolean filled) {
		dateCreated = new java.util.Date();
		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 "Created on " + dateCreated + "\ncolor: " + color
				+ "and filled: " + filled;
	}

	public static void main(String[] args) {

		Circle c1 = new Circle(1, "BLUE", true);
		Circle c2 = new Circle(2, "BLUE", true);
		Circle c3 = new Circle(3, "BLUE", false);
		Circle c4 = new Circle(4, "BLACK", true);
		System.out.println("c1 ? c1 " + c1.compareTo(c1));
		System.out.println("c1 ? c2 " + c1.compareTo(c2));
		System.out.println("c1 ? c3 " + c1.compareTo(c3));
		System.out.println("c1 ? c4 " + c1.compareTo(c4));
		Rectangle r1 = new Rectangle(1, 1, "BLUE", true);
		Rectangle r2 = new Rectangle(2, 2, "RED", true);
		Rectangle r3 = new Rectangle(4, 4, "GREEN", false);
		Rectangle r4 = new Rectangle(4, 4, "GREEN", true);
		System.out.println("r1 ? r2 " + r1.compareTo(r2));
		System.out.println("r1 ? r2 " + r1.compareTo(r2));
		System.out.println("c1 ? r2 " + c1.compareTo(r2));
		System.out.println("r3 ? r4 " + r3.compareTo(r4));

	}

	public abstract double getArea();

	private double getTrueArea() {
		return (filled ? 1 : 0.5f) * getArea();
	}

	@Override
	public int compareTo(GeometricObject obj) {
		if (obj.getClass().equals(getClass())
				&& getTrueArea() == obj.getTrueArea()
				&& getColor().equals(obj.getColor())) {
			return 0;
		}
		if (this instanceof Circle && "BLUE".equals(getColor())
				&& (!(obj instanceof Circle && "BLUE".equals(obj.getColor())))) {
			return 1;
		}
		if (getTrueArea() > obj.getTrueArea()) {
			return 1;
		}
		return -1;
	}
}
Game-Over 2014-10-15
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求各位大神帮忙看看啊，真的不知道怎么改了
Game-Over 2014-10-15
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引用 9 楼 sirius93 的回复:
你第十五行把两个不同对象比，所以报了强转的异常，把五楼的代码再改一下，强转前先判断一下 

@Override
public int compareTo(Object o) {
        if(o==null || !(o instanceof Circle))return 1;
        Circle c = (Circle)o;
        return this.getColor().compareTo(c.getColor());
}}

@Override
public int compareTo(Object o) {
        if(o==null || !(o instanceof Rectangle))return 1;
        Rectangle r = (Rectangle )o;
        if(r.width == this.width && r.height == this.height){
                return 0;
        }
        if(this.width < r.width && this.height < r.height){
               return -1;
        }
        return 1;
}}
谢谢大哥，改了后已经可以全部运行出来了。可是不知道为什么运算出来的结果和它要求的不一样呢。 c1 ? c1 0 c1 ? c2 0 c1 ? c3 0 c1 ? c4 20 r1 ? r2 -1 r1 ? r2 -1 c1 ? r2 1 r3 ? r4 0
coffee-time 2014-10-15
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你第十五行把两个不同对象比，所以报了强转的异常，把五楼的代码再改一下，强转前先判断一下 

@Override
public int compareTo(Object o) {
        if(o==null || !(o instanceof Circle))return 1;
        Circle c = (Circle)o;
        return this.getColor().compareTo(c.getColor());
}}

@Override
public int compareTo(Object o) {
        if(o==null || !(o instanceof Rectangle))return 1;
        Rectangle r = (Rectangle )o;
        if(r.width == this.width && r.height == this.height){
                return 0;
        }
        if(this.width < r.width && this.height < r.height){
               return -1;
        }
        return 1;
}}
Game-Over 2014-10-15
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引用 7 楼 littlebrain4solving 的回复:
[quote=引用 6 楼 u012945394 的回复:] [quote=引用 5 楼 littlebrain4solving 的回复:] 你的Circle与Rectangle都要实现compareTo方法 @Override public int compareTo(Object o) {         Circle c = (Circle)o;         return this.getColor().compareTo(c.getColor()); }} @Override public int compareTo(Object o) {         Rectangle r = (Rectangle )o; if(r.width == this.width && r.height == this.height){ return 0; } if(this.width < r.width && this.height < r.height){ return -1; }         return 1; }}   
大神，我用了override可是我的结果为什么和它要求的不一样呢？ c1 ? c1 0 c1 ? c2 -1 c1 ? c3 -1 c1 ? c4 -1 r1 ? r2 -1 r1 ? r2 -1 Exception in thread "main" java.lang.ClassCastException: CSU.Tim.Rectangle cannot be cast to CSU.Tim.Circle1 at CSU.Tim.Circle1.compareTo(Circle1.java:58) at CSU.Tim.Testa.main(Testa.java:22) [/quote] 你把你想要的描述清楚,对象和对象比较的时候你到底想比较什么东西.[/quote] 大神应该是比较面积， The rules for comparison are 1. A blue circle is larger than any other figure (regardless of the areas involved). 2. For other cases compare the figure’s areas. However; transparent objects (filled attribute is false) contribute with only 50% of their area as opposed to a 100% for opaque objects.
littlebrain4solving 2014-10-15
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引用 6 楼 u012945394 的回复:
[quote=引用 5 楼 littlebrain4solving 的回复:] 你的Circle与Rectangle都要实现compareTo方法 @Override public int compareTo(Object o) {         Circle c = (Circle)o;         return this.getColor().compareTo(c.getColor()); }} @Override public int compareTo(Object o) {         Rectangle r = (Rectangle )o; if(r.width == this.width && r.height == this.height){ return 0; } if(this.width < r.width && this.height < r.height){ return -1; }         return 1; }}   
大神，我用了override可是我的结果为什么和它要求的不一样呢？ c1 ? c1 0 c1 ? c2 -1 c1 ? c3 -1 c1 ? c4 -1 r1 ? r2 -1 r1 ? r2 -1 Exception in thread "main" java.lang.ClassCastException: CSU.Tim.Rectangle cannot be cast to CSU.Tim.Circle1 at CSU.Tim.Circle1.compareTo(Circle1.java:58) at CSU.Tim.Testa.main(Testa.java:22) [/quote] 你把你想要的描述清楚,对象和对象比较的时候你到底想比较什么东西.
Game-Over 2014-10-15
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引用 5 楼 littlebrain4solving 的回复:
你的Circle与Rectangle都要实现compareTo方法 @Override public int compareTo(Object o) {         Circle c = (Circle)o;         return this.getColor().compareTo(c.getColor()); }} @Override public int compareTo(Object o) {         Rectangle r = (Rectangle )o; if(r.width == this.width && r.height == this.height){ return 0; } if(this.width < r.width && this.height < r.height){ return -1; }         return 1; }}   
大神，我用了override可是我的结果为什么和它要求的不一样呢？ c1 ? c1 0 c1 ? c2 -1 c1 ? c3 -1 c1 ? c4 -1 r1 ? r2 -1 r1 ? r2 -1 Exception in thread "main" java.lang.ClassCastException: CSU.Tim.Rectangle cannot be cast to CSU.Tim.Circle1 at CSU.Tim.Circle1.compareTo(Circle1.java:58) at CSU.Tim.Testa.main(Testa.java:22)
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