JAVA初学者,在JDK中怎样写菜单事件?

[shzwz]

我已经编写完了记事本的外观,菜单也挂上去了,但是怎样才能把需要的事件写上去那 ?请大家帮忙!

[shzwz]

请具体一点儿好吗?我可是个新手啊 !

[kelvinqi]

你去看看javadoc文档

[jery_lee]

public boolean handleEvent(Event evt) {
if(evt.id == Event.WINDOW_DESTROY)
System.exit(0);
else
return super.handleEvent(evt);
return true;
}

[jery_lee]

这是一个菜单例子程序。你可以看看。

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();
}
}

[kyobo]

学习

[mercury1231]

xxx.addActionListener( new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
XXXXXXXXXXXXX;
}
}
);

[Winuxava]

这种问题不应该在论坛问的，应该看书，下载一本java的书查查更清楚，
基本上哪本书都有，太基础了。

[Winuxava]

addXXXListener()啊