Java GUI之位置控制与尺寸控制

以下四个类都包含在java.awt包内。1. Toolkit类：Toolkit类是一个包含了本机系统属性和参数的抽象类，比如Clipboard内容、光标、桌面属性、字体族、颜色类型、屏幕参数和系统事件。2. Dimension类：Dimension类通常用来获取或设置组件的尺寸。与Toolkit类配合使用，则可以获取屏幕尺寸。3. GraphicsEnvironment类：GraphicsEnvironment类是一个包含本级系统图像环境的类。4. Rectangle类：Rectangle类是矩形类。

package com.sinosuperman.driver;
import java.awt.Dimension;
import java.awt.GraphicsEnvironment;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Toolkit;
public class MainBench {
public static void main（String[] args） {
// Get a Toolkit object containing system properties and parameters.
Toolkit tk = Toolkit.getDefaultToolkit（）;
// Get a Dimension object containing screen size.
Dimension d = tk.getScreenSize（）;
// Get the screen width.
System.out.println（d.getWidth（））;
// Get the screen height.
System.out.println（d.getHeight（））;
// Get a GraphicsEnvironment object containing system graphics environment.
GraphicsEnvironment environment = GraphicsEnvironment.getLocalGraphicsEnvironment（）;
// Get a Rectangle object containing the maximum window bounds of current window.
Rectangle rec = environment.getMaximumWindowBounds（）;
// Get the x-coordinate of the center point of rec.
System.out.println（rec.getCenterX（））;
// Get the y-coordinate of the center point of rec.
System.out.println（rec.getCenterY（））;
System.out.println（rec）;
// Get the center point of system graphics environment.
Point point = environment.getCenterPoint（）;
System.out.println（point）;
// Get the location of rec.
point = rec.getLocation（）;
System.out.println（point）;
}
}