java2实用教程(第三版)第八章课后习题答案(耿祥义).doc

第八章第1题分四个部分分别建四个Java文本（1）public class Application public static void main(String args) new MyFrame(对话框实践);（2）import java.awt.*;import java.awt.event.*;public class ExceptionDialog extends Dialog implements ActionListener Button btn;public ExceptionDialog(Frame f) super(f,Exception!,true);btn = new Button(close);Label label = new Label(输入格式有误!,Label.CENTER);add(label,BorderLayout.CENTER);add(btn,BorderLayout.SOUTH);btn.addActionListener(this);addWindowListener(new WindowAdapter() public void windowClosing(WindowEvent e) setVisible(false););pack();setLocation(500,330);setResizable(false);public void actionPerformed(ActionEvent e) setVisible(false);（3）import java.awt.*;import java.awt.event.*;public class MyDialog extends Dialog Button yes,no;Label label;String mess = null;public MyDialog(Frame f,boolean b) super(f,信息提示,b);label = new Label(您输入的数字 1000!是否输入?);label.setAlignment(Label.CENTER);Container con = new Container();con.setLayout(new GridLayout(1,2);yes = new Button(OK);yes.setForeground(Color.red);no = new Button(Cancle);no.setForeground(Color.red);con.add(yes);con.add(no);add(label,BorderLayout.CENTER);add(con,BorderLayout.SOUTH);addWindowListener(new WindowAdapter() public void windowClosing(WindowEvent e) setVisible(false););pack();setResizable(false);setLocation(510,330);public void setMess(String mess) this.mess = mess;this.label.setText(您输入的数字 + this.mess + 1000!是否输入?);public String getMess() return this.mess;public Button getYes() return this.yes;public Button getNo() return this.no;public void setHide() yes.setVisible(false);no.setVisible(false);（4）import java.awt.*;import java.awt.event.*;public class MyFrame extends Frame implements ActionListener MyDialog modelDialog;ExceptionDialog exception;TextField num;TextArea dis;public MyFrame(String title) super(title);modelDialog = new MyDialog(this,true);exception = new ExceptionDialog(this);num = new TextField(20);dis = new TextArea(10,10);dis.setEnabled(false);add(num,BorderLayout.NORTH);add(dis,BorderLayout.CENTER);num.addActionListener(this);modelDialog.getYes().addActionListener(this);modelDialog.getNo().addActionListener(this);addWindowListener(new WindowAdapter() public void windowClosing(WindowEvent e) System.exit(1); );setVisible(true);setLocation(500,300);setResizable(false);pack();public void actionPerformed(ActionEvent e) Object obj = e.getSource();if(obj = this.num) String str = this.num.getText();try if(Integer.parseInt(str) 1000) modelDialog.setMess(str);modelDialog.setVisible(true);else dis.append(str + n);catch (NumberFormatException e1) exception.setVisible(true);if(obj = this.modelDialog.getYes() dis.append(this.modelDialog.getMess() + n);modelDialog.setVisible(false);else if(obj = this.modelDialog.getNo() modelDialog.setVisible(false);num.setText(null);第八章第2题分四个部分分别建5个Java文本（1）public class Application public static void main(String args) new MyFrame(Dialog);（2）import java.awt.*;import java.awt.event.*;public class MyFrame extends Frame implements Info ,ActionListener TextField num;TextArea info;String mess;InfoDialog infoDialog;ExceptionDialog exceptionDialog;public MyFrame(String s) super(s);infoDialog = new InfoDialog(this);exceptionDialog = new ExceptionDialog(this);num = new TextField(30);info = new TextArea(10,30);info.setEnabled(false);num.addActionListener(this);add(num,BorderLayout.NORTH);add(info,BorderLayout.CENTER);addWindowListener(new WindowAdapter() public void windowClosing(WindowEvent e) System.exit(1););pack();setLocation(480,300);setVisible(true);setResizable(false);public void actionPerformed(ActionEvent e) mess = e.getActionCommand();if(mess = null) exceptionDialog.setVisible(true);try if(Long.parseLong(mess) 1000) infoDialog.notifyDialog();else .append(this.mess + n);catch(NumberFormatException e1) exceptionDialog.setVisible(true);this.num.setText(null);public String getMess() return this.mess;public void setInfo() .append(this.mess + n);（3）public interface DisDialog public void notifyDialog();（4）public interface Info public String getMess();public void setInfo();（5）import java.awt.*;import java.awt.event.*;public class InfoDialog extends Dialog implements ActionListener Label label;Button yes,no;Info info;public InfoDialog(Frame f) super(f,info,true); = (Info)f;yes = new Button(ok);yes.addActionListener(this);no = new Button(no);no.addActionListener(this);Container con = new Container();con.setLayout(new FlowLayout();con.add(yes);con.add(no);add(con,BorderLayout.SOUTH);label = new Label(,Label.CENTER);add(label,BorderLayout.CENTER);addWindowListener(new WindowAdapter() public void windowClosing(WindowEvent e) setVisible(false););setSize(340,90);setLocation(500,330);setResizable(false);public void actionPerformed(ActionEvent e) Object o