Java学习笔记（AWT 之 对话框）

Dialog 类是weinow 的子类，但是它必须依赖于别的窗口

package dialog;import java.awt.*;import java.awt.event.*;class MyDialogs extends Dialog implements ActionListener {static final int YES = 1,NO = 0;int message = -1;Button yes,no;MyDialogs(Frame f,String s,boolean b){super(f,s,b);yes = new Button("YES");no = new Button("NO");no.addActionListener(this);yes.addActionListener(this);setLayout(new FlowLayout());add(yes);add(no);setBounds(60, 60, 100, 100);addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){message = -1;setVisible(false);}});}public void actionPerformed(ActionEvent e){if(e.getSource() == yes){System.out.println("click yes");message = YES;setVisible(false);} else if(e.getSource() == no){message = NO;setVisible(false);}}public int getMessage(){return message;}}class Dwindow extends Frame implements ActionListener{TextArea text;Button button;MyDialogs  dialog;Dwindow(String s){super(s);text = new TextArea(10,22);button = new Button("open dialog");button.addActionListener(this);setLayout(new FlowLayout());add(button);add(text);dialog = new MyDialogs(this,"my have mode", true);setBounds(60, 60, 300,300);setVisible(true);validate();addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){System.exit(0);}});}public void actionPerformed(ActionEvent e){if(e.getSource() == button){dialog.setVisible(true);if(dialog.getMessage() == MyDialogs.YES){text.append("\n你单击了对话框的yes按钮");}else if(dialog.getMessage() == MyDialogs.NO){text.append("\n你单击了对话框的NO按钮");}}}}public class MyDialog{public static void main(String args[]){new Dwindow("带对话框的窗口");}}