The specs say that getBounds() returns a Rectangle object which represents the
bounding box of the Shape. getBounds2D() on the other hand returns a
Rectangle2D object which represents the high-precision bounding box of the Arc.

However, for the same Arc, the values returned by the two methods are very
different.
import java.awt.geom.Arc2D;
import java.awt.geom.Rectangle2D;
import java.awt.Rectangle;

public class Test {
public Test() {

String msg = "Arc2D.Float.getBounds2D(): ";

try {
Arc2D.Float arc = new Arc2D.Float(10,15,25,40,44,100,Arc2D.OPEN);

System.out.println(arc+".getBounds() returns "+arc.getBounds());
System.out.println();
System.out.println(arc+".getBounds2D() returns "+arc.getBounds2D());

} catch (Throwable ee) {
System.out.println(msg+": got Exception "+ee);
}
}

public static void main(String args[]) {
new Test();
}
  }


Although the Shape interface documents that the Bounds2D is likely
to be tighter, the doc needs to be specific about the difference
between the values returned by getBounds() and getBounds2D().