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);
	}
}