| 发表于：2007-03-31 12:45:152楼 得分:0 |
//转高手帖子，仅供参考
menu1.java
import java.awt.*;
public class menu1 extends frame {
string[] flavors = { "chocolate ", "strawberry ",
"vanilla fudge swirl ", "mint chip ",
"mocha almond fudge ", "rum raisin ",
"praline cream ", "mud pie " };
textfield t = new textfield（ "no flavor ", 30);
menubar mb1 = new menubar（);
menu f = new menu（ "file ");
menu m = new menu（ "flavors ");
menu s = new menu（ "safety ");
// alternative approach:
checkboxmenuitem[] safety = {
new checkboxmenuitem（ "guard "),
new checkboxmenuitem（ "hide ")
};
menuitem[] file = {
new menuitem（ "open "),
new menuitem（ "exit ")
};
// a second menu bar to swap to:
menubar mb2 = new menubar（);
menu foobar = new menu（ "foobar ");
menuitem[] other = {
new menuitem（ "foo "),
new menuitem（ "bar "),
new menuitem（ "baz "),
};
button b = new button（ "swap menus ");
public menu1（) {
for（int i = 0; i < flavors.length; i++) {
m.add（new menuitem（flavors[i]));
// 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（ "center ", t);
// set up the system for swapping menus:
add（ "north ", b);
for（int i = 0; i < other.length; i++)
foobar.add（other[i]);
mb2.add（foobar);
}
public boolean handleevent（event evt) {
if（evt.id == event.window_destroy)
system.exit（0);
else
return super.handleevent（evt);
return true;
}
public boolean action（event evt, object arg) {
if（evt.target.equals（b)) {
menubar m = getmenubar（);
if（m == mb1) setmenubar（mb2);
else if （m == mb2) setmenubar（mb1);
}
else if（evt.target instanceof menuitem) {
if（arg.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（evt.target.equals（file[1]))
system.exit（0);
// checkboxmenuitems cannot use string
// matching; you must match the target:
else if（evt.target.equals（safety[0]))
t.settext（ "guard the ice cream! " +
"guarding is " + safety[0].getstate（));
else if（evt.target.equals（safety[1]))
t.settext（ "hide the ice cream! " +
"is it cold? " + safety[1].getstate（));
else
t.settext（arg.tostring（));
}
else
return super.action（evt, arg);
return true;
}
public static void main（string[] args) {
menu1 f = new menu1（);
f.resize（300,200);
f.show（);
}
}
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