初学者第二步，几个JAVA文件的理解

wu_solo 2004-08-30 11:16:22

第一步，我已经安装了JAVA的环境，JBUILDER8和JDK，在JDK下编译了几个JAVA文件，由于我曾经用C/C++，所以就想直接用JBUILEDER，熟悉了一下它的环境，开始按照C++BUILDER的方法用JB；
第二步，开始编写一些小程序，就是C的教材上一些典型的程序，尽管弄了几个，但对于其中的几个JAVA文件不是十分了解，希望那位对JAVA理解得很清楚的说说。
1。application1.java
package firstwxj;

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

/**
* Title: firstwxj
* Description: wxjwhqwy
* Copyright: Copyright (c) 2004
* Company: 
* @author not attributable
* @version 1.0
*/

public class Application1 {
boolean packFrame = false;

//Construct the application
public Application1() {
firstwxj frame = new firstwxj();
//Validate frames that have preset sizes
//Pack frames that have useful preferred size info, e.g. from their layout
if (packFrame) {
frame.pack();
}
else {
frame.validate();
}
//Center the window
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
Dimension frameSize = frame.getSize();
if (frameSize.height > screenSize.height) {
frameSize.height = screenSize.height;
}
if (frameSize.width > screenSize.width) {
frameSize.width = screenSize.width;
}
frame.setLocation((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2);
frame.setVisible(true);
}
//Main method
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
}
catch(Exception e) {
e.printStackTrace();
}
new Application1();
}
}

2.firstwxj.java
package firstwxj;

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

/**
* Title: firstwxj
* Description: wxjwhqwy
* Copyright: Copyright (c) 2004
* Company: 
* @author not attributable
* @version 1.0
*/

public class firstwxj extends JFrame {
JPanel contentPane;
BorderLayout borderLayout1 = new BorderLayout();
JTextField jTextField1 = new JTextField();

//Construct the frame
public firstwxj() {
enableEvents(AWTEvent.WINDOW_EVENT_MASK);
try {
jbInit();
}
catch(Exception e) {
e.printStackTrace();
}
}
//Component initialization
private void jbInit() throws Exception {
contentPane = (JPanel) this.getContentPane();
jTextField1.setText("jTextField1");
contentPane.setLayout(borderLayout1);
this.setSize(new Dimension(400, 300));
this.setTitle("wxjFrame");
contentPane.add(jTextField1, BorderLayout.NORTH);
}
//Overridden so we can exit when window is closed
protected void processWindowEvent(WindowEvent e) {
super.processWindowEvent(e);
if (e.getID() == WindowEvent.WINDOW_CLOSING) {
System.exit(0);
}
}
}

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