?? guiexample.java
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/* 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 independant selection box
Checkbox option;
public void init()
{
// Tell the applet not to use a layout manager.
setLayout(null);
// initialze 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);
// Lbal 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);
}
}
// Thats's it, you now have given the user visual options.
// However there are no actions related to these comonents.
// 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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