drawstringcolortest.java

编程之道--java程序设计入门源代码

/**
 *　在面板中绘制字符串，设置字符串的颜色与面板的背景色
 */

import javax.swing.JFrame;
import java.awt.Toolkit;
import java.awt.Image;
import java.awt.Dimension;
import java.awt.Container;
import java.awt.Graphics;
import javax.swing.JPanel;
import java.awt.Color;

public class DrawStringColorTest
{
	public static void main(String[] args)
	{
		BlankFrame frame = new BlankFrame();
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.show();
	} 
}

/**
 *　这是定制自己的框架
 */
class BlankFrame extends JFrame
{
	private static final int WIDTH = 300;
	private static final int HEIGHT = 200;
	public BlankFrame()
	{
		Container con = getContentPane();//得到了内容窗格
		
		Toolkit kit = Toolkit.getDefaultToolkit();
		Dimension screenSize = kit.getScreenSize();
		int width = screenSize.width;
		int height = screenSize.height;
		int x = (width - WIDTH)/2;
		int y = (height - HEIGHT)/2;
		setLocation(x, y);//设置坐标起点
		setSize(WIDTH, HEIGHT);//设置框架的大小
		Image image = kit.getImage("duke.gif");// duke.gif为图像文件名
		setIconImage(image);//设置框架图标
		setTitle("这是我美化的框架");
		setResizable(false);
		
		StringPanel panel = new StringPanel();//得到定制的面板
		con.add(panel);//将面板添加到内容窗格中
	}
}

/**
 *　这是继承了JPanel面板类，它重载了绘制的方法
 */
class StringPanel extends JPanel
{
	public static final int WIDTH = 75;
	public static final int HEIGHT = 100;
	
	public StringPanel()
	{
		setBackground(Color.blue);//设置背景色
		setForeground(Color.red);//设置前景色
	}

	public void paintComponent(Graphics g)
	{
		super.paintComponent(g);
		g.drawString("我可以显示出我的文本了", WIDTH, HEIGHT);
	}
}