demodialogframe.java

java绘图 java awt 经典绘图的例子,对于初学awt模块的人非常有帮助.

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package swing;

import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;

/**
 *
 * @author zhaolin
 */
public class DemoDialogFrame extends JDialog{
    public DemoDialogFrame(){
        this(null);
    }
    public DemoDialogFrame(JFrame owner){
        super(owner);
        this.setModal(true);
        JLabel label = new JLabel("in Dialog");
        this.getContentPane().add(label);
        JButton button = new JButton("exit");
        button.addActionListener(new ActionListener(){

            public void actionPerformed(ActionEvent e) {
                setVisible(false);
            }
        
        });
        this.getContentPane().add(button,"South");
    }
    
    public static void main(String[] args) {    
        final JFrame f = new JFrame();
        final DemoDialogFrame dialog = new DemoDialogFrame(f);
        dialog.setSize(400,360);
        JButton button = new JButton("打开对话框");
        button.addActionListener(new ActionListener(){

            public void actionPerformed(ActionEvent e) {
                int frameX = f.getX();
                int frameY = f.getY();
                int frameWidth = f.getWidth();
                int frameHeight = f.getHeight();
                
                int x = (frameWidth-dialog.getWidth())/2+frameX;
                int y = (frameHeight-dialog.getHeight())/2+frameY;
                dialog.setLocation(x,y);
                dialog.setVisible(true);
            }
        
        });
        f.getContentPane().add(button);
        f.setSize(500,480);
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        int x = (int)(screenSize.getWidth()-f.getWidth())/2;
        int y = (int)(screenSize.getHeight()-f.getHeight())/2;
        f.setLocation(x,y);
        f.setVisible(true);
        
        
    }

}