再探早期示例 - 编程入门网
作者 佚名技术
来源 NET编程
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发布时间 2012-07-04
| , new MenuItem("Bar"), new MenuItem("Baz"), }; // Initialization code: { ML ml = new ML(); CMIL cmil = new CMIL(); safety[0].setActionCommand("Guard"); safety[0].addItemListener(cmil); safety[1].setActionCommand("Hide"); safety[1].addItemListener(cmil); file[0].setActionCommand("Open"); file[0].addActionListener(ml); file[1].setActionCommand("Exit"); file[1].addActionListener(ml); other[0].addActionListener(new FooL()); other[1].addActionListener(new BarL()); other[2].addActionListener(new BazL()); } Button b = new Button("Swap Menus"); public MenuNew() { FL fl = new FL(); for(int i = 0; i < flavors.length; i++) { MenuItem mi = new MenuItem(flavors[i]); mi.addActionListener(fl); m.add(mi); // Add separators at intervals: if((i+1) % 3 == 0) m.addSeparator(); } for(int i = 0; i < safety.length; i++) s.add(safety[i]); f.add(s); for(int i = 0; i < file.length; i++) f.add(file[i]); mb1.add(f); mb1.add(m); setMenuBar(mb1); t.setEditable(false); add(t, BorderLayout.CENTER); // Set up the system for swapping menus: b.addActionListener(new BL()); add(b, BorderLayout.NORTH); for(int i = 0; i < other.length; i++) fooBar.add(other[i]); mb2.add(fooBar); } class BL implements ActionListener { public void actionPerformed(ActionEvent e) { MenuBar m = getMenuBar(); if(m == mb1) setMenuBar(mb2); else if (m == mb2) setMenuBar(mb1); } } class ML implements ActionListener { public void actionPerformed(ActionEvent e) { MenuItem target = (MenuItem)e.getSource(); String actionCommand = target.getActionCommand(); if(actionCommand.equals("Open")) { String s = t.getText(); boolean chosen = false; for(int i = 0; i < flavors.length; i++) if(s.equals(flavors[i])) chosen = true; if(!chosen) t.setText("Choose a flavor first!"); else t.setText("Opening "+ s +". Mmm, mm!"); } else if(actionCommand.equals("Exit")) { dispatchEvent( new WindowEvent(MenuNew.this, WindowEvent.WINDOW_CLOSING)); } } } class FL implements ActionListener { public void actionPerformed(ActionEvent e) { MenuItem target = (MenuItem)e.getSource(); t.setText(target.getLabel()); } } // Alternatively, you can create a different // class for each different MenuItem. Then you // Don''t have to figure out which one it is: class FooL implements ActionListener { public void actionPerformed(ActionEvent e) { t.setText("Foo selected"); } } class BarL implements ActionListener { public void actionPerformed(ActionEvent e) { t.setText("Bar selected |
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