metrics.java

本java源程序包括了大量的学习程序（共27章）方便大家学习

import java.awt.*;
import javax.swing.*;
public class Metrics extends JFrame{
	public Metrics(){
		super("解释字体规格");
		setSize(510, 210);
		setVisible(true);
	}
	
	//输出每个字体对象所对应的字体规格，比如：
	//字体上升值的值，字体下降值的值，字体超出值的值，字体高度的值
	public void paint(Graphics g){
		super.paint(g);       //调用父类JFrame的方法paint();
		g.setFont(new Font("SansSerif", Font.BOLD, 12));
		//返回当前绘制字体的FontMetrics对象
		FontMetrics metrics = g.getFontMetrics();
		g.drawString("当前字体: " + g.getFont(), 10, 40);
		g.drawString("上升值: " + metrics.getAscent(), 10, 55);
		g.drawString("下降值: " + metrics.getDescent(), 10, 70);
		g.drawString("高度: " + metrics.getHeight(), 10, 85);
		g.drawString("超出值: " + metrics.getLeading(), 10, 100);
		
		Font font = new Font("Serif", Font.ITALIC, 14);
		//返回font参数所指定的FontMetrics对象
		metrics = g.getFontMetrics(font);
		g.setFont(font);
		g.drawString("当前字体: " + g.getFont(), 10, 130);
		g.drawString("上升值: " + metrics.getAscent(), 10, 145);
		g.drawString("下降值: " + metrics.getDescent(), 10, 160);
		g.drawString("高度: " + metrics.getHeight(), 10, 175);
		g.drawString("超出值: " + metrics.getLeading(), 10, 190);		
	}//paint()结束
	
	public static void main(String[] args) {
		Metrics application = new Metrics();
		application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
}