testframe.java

这是JFrame的一些例子(example2)。可以参考一下。

import java.awt.*;
import javax.swing.*;

class TestFrame extends JFrame
{
  public TestFrame() {
    super( "Lets get it straight!" );
    getContentPane().add(new JCanvas());
  }

  public static void main( String args[] ) {
    TestFrame mainFrame = new TestFrame();
    mainFrame.pack();
    mainFrame.setVisible( true );
  }
}

class JCanvas extends JComponent
{
  private static Font m_biFont = new Font("Monospaced", Font.BOLD, 36);

  public void paintComponent(Graphics g) {
    g.setColor(Color.black);

    // Bold 36-point "Swing"
    g.setFont(m_biFont);
    FontMetrics fm = g.getFontMetrics();
    int h = fm.getAscent();

    g.drawString("Swing",50,50); // Try these as well: