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);
}
}