java.awt.geom.Rectangle2D 的字段？

Question

Not a Java person here, I'm just trying this code in Processing.org :

//import java.awt.Rectangle; // int only
import java.awt.geom.Rectangle2D; 

Rectangle2D testr;

void setup() {
  testr = new Rectangle2D.Float(1.0, 1.0, 30.0, 30.0);
  println(testr);
  //println(testr.x);
}

It prints out:

java.awt.geom.Rectangle2D$Float[x=1.0,y=1.0,w=30.0,h=30.0]

... which sort of implies where are x and y fields accessible? Even Rectangle2D.Float (Java Platform SE 7 ) says:

Field Summary
...
float x
The X coordinate of this Rectangle2D.

And yet, if I uncomment println(testr.x); , compilation fails with:

testr.x cannot be resolved or not a field.

Where am I going wrong - and why cannot I access a field, which the documentation clearly says exists?

Btw, this is what I find in /tmp as the full .java source when the processing .pde manages to compile:

import processing.core.*; 
import processing.data.*; 
import processing.event.*; 
import processing.opengl.*; 

import java.awt.geom.Rectangle2D; 

import java.util.HashMap; 
import java.util.ArrayList; 
import java.io.File; 
import java.io.BufferedReader; 
import java.io.PrintWriter; 
import java.io.InputStream; 
import java.io.OutputStream; 
import java.io.IOException; 

public class sketch_140204c extends PApplet {


//import java.awt.Rectangle; // int only


Rectangle2D testr;

public void setup() {
  testr = new Rectangle2D.Float(1.0f, 1.0f, 30.0f, 30.0f);
  println(testr);
}

  static public void main(String[] passedArgs) {
    String[] appletArgs = new String[] { "sketch_140204c" };
    if (passedArgs != null) {
      PApplet.main(concat(appletArgs, passedArgs));
    } else {
      PApplet.main(appletArgs);
    }
  }
}

Answer 1

These fields are declared on Rectangle2D.Float but testr is just a Rectangle2D . Changing its declaration will let you access them since they are public:

Rectangle2D.Float testr;

It's a good suggestion to use getters and setters but there aren't individual setters for these classes. Only setters to set the entire rectangle (namely setRect ).

Answer 2

These fields are declared on Rectangle2D.Float you can print to control.

Ellipse2D.Float test= new Ellipse2D.Float(getPosX()-40,getPosY()-40,30.0f, 30.0f);
        System.out.println(test.getCenterX());
        System.out.println(test.getCenterY());
        System.out.println(test.getMinX());
        System.out.println(test.getMinY());
        System.out.println(test.getMaxX());
        System.out.println(test.getMaxY());