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| Bruce Eckel’s Thinking in Java | Contents | Prev | Next |
Making
a button is quite simple: you just call the Button
constructor with the label you want on the button. (You can also use the
default constructor if you want a button with no label, but this is not very
useful.) Usually you’ll want to create a handle for the button so you can
refer to it later.
a button is quite simple: you just call the Button
constructor with the label you want on the button. (You can also use the
default constructor if you want a button with no label, but this is not very
useful.) Usually you’ll want to create a handle for the button so you can
refer to it later.
The
Button
is a component, like its own little window, that will automatically get
repainted as part of an update. This means that you don’t explicitly
paint a button or any other kind of control; you simply place them on the form
and let them automatically take care of painting themselves. So to place a
button on a form you override
init( )
instead
of overriding
paint( ):
Button
is a component, like its own little window, that will automatically get
repainted as part of an update. This means that you don’t explicitly
paint a button or any other kind of control; you simply place them on the form
and let them automatically take care of painting themselves. So to place a
button on a form you override
init( )
instead
of overriding
paint( ):
//: Button1.java // Putting buttons on an applet import java.awt.*; import java.applet.*; public class Button1 extends Applet { Button b1 = new Button("Button 1"), b2 = new Button("Button 2"); public void init() { add(b1); add(b2); } } ///:~
It’s
not enough to create the
Button
(or any other control). You must also call the
Applet
add( )
method to cause the button to be placed on the applet’s form. This seems
a lot simpler than it is, because the call to
add( )
actually decides, implicitly, where to place the control on the form.
Controlling the layout of a form is examined shortly.
not enough to create the
Button
(or any other control). You must also call the
Applet
add( )
method to cause the button to be placed on the applet’s form. This seems
a lot simpler than it is, because the call to
add( )
actually decides, implicitly, where to place the control on the form.
Controlling the layout of a form is examined shortly.
