testpanels.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。

// TestPanels.java: Use panels to group components
import java.awt.*;
import javax.swing.*;

public class TestPanels extends JFrame
{
  // Default constructor
  public TestPanels()
  {
    // Get the content pane of the frame
    Container container = getContentPane();

    // Set BorderLayout for the frame
    container.setLayout(new BorderLayout());

    // Create panel p1 for the buttons and set GridLayout
    JPanel p1 = new JPanel();
    p1.setLayout(new GridLayout(4, 3));

    // Add buttons to the panel
    for (int i=1; i<=9; i++)
    {
      p1.add(new JButton(" " + i));
    }

    p1.add(new JButton(" " + 0));
    p1.add(new JButton("Start"));
    p1.add(new JButton("Stop"));

    // Create panel p2 to hold a text field and p1
    JPanel p2 = new JPanel();
    p2.setLayout(new BorderLayout());
    p2.add(new TextField("Time to be displayed here"),
      BorderLayout.NORTH);
    p2.add(p1, BorderLayout.CENTER);

    // Add p2 and a button to the frame
    container.add(p2, BorderLayout.EAST);
    container.add(new Button("Food to be placed here"),
      BorderLayout.CENTER);
  }

  // Main method
  public static void main(String[] args)
  {
    TestPanels frame = new TestPanels();
    frame.setTitle("The Front View of a Microwave Oven");
    // frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(400, 250);
    frame.setVisible(true);
  }
}