java.awt.Rectangle.inside doesn't work

Member function inside(int, int) of
class java.awt.Rectangle does not work for
rectangles with origin different from (0,0).
Following is an example program. Its output is:
point (5, 5) is inside java.awt.Rectangle[x=0,y=0,width=10,height=10]
point (15, 15) is not inside java.awt.Rectangle[x=10,y=10,width=10,height=10]
The second line is wrong.
-------- Inside.java -----
import java.awt.Rectangle;

class Inside {

private static void tryInside( Rectangle r, int x, int y ){
    System.out.print("point ("+x+", "+y+")" );
    System.out.print( r.inside( x, y )?" is ":" is not " );
    System.out.println("inside "+ r.toString() );
}

public static void main( String ignore[] ) {
    // rectangle at origin. 10 units on a side.
    Rectangle tenByTen = new Rectangle( 0, 0, 10, 10 );
    // point (5,5) should be inside this rectangle
    tryInside( tenByTen, 5, 5 );
    // now move the 10x10 rectangle to point (10,10)
    tenByTen.move( 10, 10 );
    // point (15,15) should be inside this rectangle
    tryInside( tenByTen, 15, 15 );
}
}