Swing代码分析（2）

package nau.ui;import javax.swing.JFrame;import javax.swing.JMenu;import javax.swing.JMenuBar;import javax.swing.JMenuItem;/** * * 功能： * * @author wzj * */public class SwingMenuTestTool extends JFrame { private JMenuBar jMenuBar = null; private JMenu operJMenu = null; private JMenuItem copyJMenuItem = null; private JMenuItem pasteJMenuItem = null; /** * * */ public SwingMenuTestTool() {this.setLayout(null);jMenuBar = new JMenuBar();operJMenu = new JMenu("File");copyJMenuItem = new JMenuItem("copy");pasteJMenuItem = new JMenuItem("paste");operJMenu.add(copyJMenuItem);operJMenu.add(pasteJMenuItem);jMenuBar.add(operJMenu);this.setJMenuBar(jMenuBar);this.setTitle("SwingMenuTestTool");this.setBounds(300, 250, 500, 150);this.setVisible(true); } /** * * * @param args */ public static void main(String[] args) {new SwingMenuTestTool(); }}