guiexample.java

window下使用j2ee的jms工具做的网络应用的一个架构程序

/* 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