Using basic components
/* Now the applet will have a GUI
These are elements to interact with the user.
In this example they will not perform any actions.
We will use no Layout manager;
*/
import java.awt.*;
import java.applet.*;
public class GuiExample extends Applet
{
// A Button to click
Button okButton;
// A textField to get text input
TextField
nameField;
// A group of radio buttons
// necessary to only allow one radio button
to be selected at the same time.
CheckboxGroup
radioGroup;
// The radio buttons to be selected
Checkbox
radio1;
Checkbox
radio2;
// An independent selection box
Checkbox
option;
public
void init()
{
// Tell the applet not to use a layout
manager.
setLayout(null);
// initialize the button and give it a
text.
okButton
= new Button("A button");
// text and length of the field
nameField
= new TextField("A TextField",100);
// initialize the radio buttons group
radioGroup = new CheckboxGroup();
// first radio button. Gives the label
text, tells to which
// group it belongs and sets the default
state (unselected)
radio1 = new Checkbox("Radio1", radioGroup,false);
// same but selected
radio2 = new Checkbox("Radio2", radioGroup,true);
// Label and state of the checkbox
option = new Checkbox("Option",false);
// now we will specify the positions of
the GUI components.
// this is done by specifying the x and
y coordinate and
//the width and height.
okButton.setBounds(20,20,100,30);
nameField.setBounds(20,70,100,40);
radio1.setBounds(20,120,100,30);
radio2.setBounds(140,120,100,30);
option.setBounds(20,170,100,30);
// now that all is set we can add these
components to the applet
add(okButton);
add(nameField);
add(radio1);
add(radio2);
add(option);
}
}
// That's it, you now have given the user visual
options.
// However there are no actions related to these
components.
// You will see that later, first an example
of a layoutmanager
// that makes it easier to place components.
// Go to LayoutExample.
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