messagepanel.java

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import javax.swing.*;
import java.io.*;

import java.awt.*;
//显示字体
public class MessagePanel extends JPanel implements Serializable {
	private String message = "Welcome to Java";

	private static final long serialVersionUID=635352323333333333L;
	private int xCoordinate = 20;
	private int yCoordinate = 20;
	private boolean centered;
	public MessagePanel() {
		// TODO Auto-generated constructor stub
		
	}
	public MessagePanel(String message)
	{
		this.message = message;
	}
	public String getMessage()
	{
		return message;
	}
	public void setMessage(String message)
	{
		this.message = message;
	}
	public int getXCoordinate()
	{
		return xCoordinate;
	}
	public void setXCoordinate(int xCoordinate)
	{
		this.xCoordinate = xCoordinate;
	}
	public int getYCoordinate()
	{
		return xCoordinate;
	}
	public void setYCoordinate(int yCoordinate)
	{
		this.yCoordinate = yCoordinate;
	}
	public boolean isCentered()
	{
		return centered;
	}
	public void setCentered(boolean centered)
	{
		this.centered = centered;
	}
	public void paintComponent(Graphics g)
	{
		super.paintComponent(g);
		if(centered)
		{
			FontMetrics fm = g.getFontMetrics();
			int w = fm.stringWidth(message);
			int h = fm.getAscent();
			xCoordinate = (getSize().width - w) / 2;
			yCoordinate = (getSize().height + h) / 2;
		}
		g.drawString(message, xCoordinate, yCoordinate);
	}
	public Dimension getPreferredSize()
	{
		return new Dimension(200,100);
	}
	public Dimension getMinimumSize()
	{
		return new Dimension(200,100);
	}

}