как то так:
import java.awt.BorderLayout;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Dimension;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class JFrameWithCanvas extends JFrame {
private Canvas canvas = new Canvas();
public JFrameWithCanvas() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel pnlToolbar = new JPanel();
pnlToolbar.add(new JTextField(10));
pnlToolbar.add(new JButton("foo"));
getContentPane().add(pnlToolbar, BorderLayout.PAGE_START);
canvas.setBackground(Color.MAGENTA);
getContentPane().add(canvas, BorderLayout.CENTER);
canvas.setPreferredSize(new Dimension(300, 300));
pack();
setLocationRelativeTo(null); // center it on the screen
}
public static void main(String[] args) {
new JFrameWithCanvas().setVisible(true);
}
}