OOP2 Color Rectangle

public class ColorRectangle extends rgb implements
Comparable<Object>{
private int ix1,iy1,ix2,iy2;
public ColorRectangle(){}
public ColorRectangle(int x1,int y1,int x2,int y2)
{
    this.ix1 = x1;
    this.iy1 = x2;
    this.ix2 = y1;
    this.iy2 = y1;
}
public int getIX1() { return ix1; }
public int getIY1() { return iy1; }
public int getIX2() { return ix2; }
public int getIY2() { return iy2; }
public int calcArea()
{
    return Math.abs((ix2-ix1)*(iy2-iy1));
}
public int compareTo(Object r){
    if(this.calcArea()<((ColorRectangle)r).calcArea())
    {
        return -1;
    }
    if(this.calcArea()>((ColorRectangle)r).calcArea())
    {
        return 1;
    }
return 0;
}
public String toString()
    {
        return "x1:" + ix1 + " y1:" + iy1 + " x2:" + ix2 + " y2:" + iy2;
    }
public boolean equals(ColorRectangle R)
{
    return (this.calcArea()==R.calcArea());
}
public void translateX(int iPoints)
{
    ix1+=iPoints;
    ix2+=iPoints;
}
public void translateY(int iPoints)
{
    iy1+=iPoints;
    iy2+=iPoints;

}
public void translateXY(int iPoints)
{
    translateX(iPoints);
    translateY(iPoints);
}
public boolean isInside(int ptX,int ptY)
{
    return(ix1 < ptX && ix2>ptY && iy1<ptY && iy2 > ptY);
}
public ColorRectangle unionRect(ColorRectangle R)
{
    int x = ix1<R.ix1? ix1 : R.ix1;
    int y = iy1<R.iy1? iy1 : R.iy1;
    int x2 = ix2>R.ix2? ix2 : R.ix2;
    int y2 = iy2>R.iy2? iy2 : R.iy2;
return new ColorRectangle(x,y,x2,y2);
}
public ColorRectangle intersectionRect(ColorRectangle R)
{
    int x = ix1>R.ix1? ix1 : R.ix1;
    int y = iy1>R.iy1? iy1 : R.iy1;
    int x2 = ix2<R.ix2? ix2 : R.ix2;
    int y2 = iy2<R.iy2? iy2 : R.iy2;
return new ColorRectangle(x,y,x2,y2);
}
public static void main(String[] args)
{
    ColorRectangle r1 = new ColorRectangle(5,5,12,12);
    ColorRectangle r2 = new ColorRectangle(4,4,2,2);
System.out.println("r1: " + r1.toString());
System.out.println("r2: " + r2.toString());
if(r1.equals(r2))
{
    System.out.println("Areas are equal");
}
else
    System.out.println("Areas are not equal");
    ColorRectangle U = r1.unionRect(r2);
    System.out.println("r3: "+U.toString());
}

}