testfontmetrics.java

此源码为机械工业出版社出版的《Java语言程序设计》第三版所配套的书中所有源代码。

// TestFontMetrics.java: Draw a message at the center of a panel
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import javax.swing.*;

public class TestFontMetrics extends JFrame
{
  // Default constructor
  public TestFontMetrics()
  {
    MessagePanel messagePanel = new MessagePanel("Welcome to Java");

    // Set font SansSerif 20-point bold
    messagePanel.setFont(new Font("SansSerif", Font.BOLD, 20));

    // Center the message
    messagePanel.setCentered(true);
    
    getContentPane().add(messagePanel);
  }

  // Main method
  public static void main(String[] args)
  {
    TestFontMetrics frame = new TestFontMetrics();
    // frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(300, 200);
    frame.setTitle("TestFontMetrics");
    frame.setVisible(true);
  }
}