gbcall.java

JAVA程序设计课程中各章节的程序实例。

/**
*A simple program using components within a panel with GridBagLayout
*2004.12.4. 
*/
import java.awt.*;
import java.awt.event.*;

public class GBCall extends Frame
{
	Panel pTime = new Panel();
	Panel pApp = new Panel();
	TextField txTime9 = new TextField("09:00");
	TextField txTime930 = new TextField("09:30");
	TextField txApp = new TextField("Meeting ");
	GridBagLayout gb1 = new GridBagLayout();
	GridBagLayout gb2 = new GridBagLayout();
	GridBagConstraints gbc = new GridBagConstraints();

	public static void main(String args[])
	{
		GBCall gbc = new GBCall();
		gbc.setLayout(new FlowLayout());
	}

	public GBCall()
	{
		setLayout(gb1);
		pTime.setLayout(gb2);

		gbc.gridx = 0;
		gbc.gridy = 0;
		pTime.add(txTime9,gbc);

		gbc.gridx = 0;
		gbc.gridy = 1;
		pTime.add(txTime930,gbc);

		pTime.setBackground(Color.red);
		//RE-using gbc for the main panel layout!!!
		gbc.gridx = 0;
		gbc.gridy = 0;
		gbc.ipadx = 30;
		add(pTime,gbc);
		pApp.setLayout(gb2);

		gbc.gridx = 0;
		gbc.gridy = 1;
		pApp.add(txApp,gbc);

		gbc.gridx = 1;
		gbc.gridy = 0;
		gbc.ipadx = 100;
		pApp.setBackground(Color.lightGray);

		add(pApp,gbc);
		setSize(300,300);
		setVisible(true);
	}
}