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一个JAVA的问题，希望高手赐教，急！！！
来源: 互联网 发布时间：2015-01-31
本文导语: 程序如下： import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.event.*; import javax.swing.text.*; class ValidationTestFrame extends JFrame implements DocumentListener { public ValidationTestFrame() { setTitle("validationTset"); s...
程序如下：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
class ValidationTestFrame extends JFrame implements DocumentListener
{
public ValidationTestFrame()
{
setTitle("validationTset");
setSize(300,200);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
Container contentPane=getContentPane();
JPanel p=new JPanel();
hourField=new IntTextField(12,3);
p.add(hourField);
hourField.getDocument().addDocumentListener(this);
minuteField=new IntTextField(0,3);
p.add(minuteField);
minuteField.getDocument().addDocumentListener(this);
contentPane.add(p,"South");
clock=new ClockPanel();
contentPane.add(clock,"Center");
}
public void insertUpdate(DocumentEvent e)
{
setClock();
}
public void removeUpdate(DocumentEvent e)
{
setClock();
}
public void changeUpdate(DocumentEvent e)
{
setClock();
}
public void setClock()
{
if (hourField.isValid() && minuteField.isValid())
{
int hours=hourField.getValue();
int minutes=minuteField.getValue();
clock.setTime(hours,minutes);
}
}
private IntTextField hourField;
private IntTextField minuteField;
private ClockPanel clock;
}
class ClockPanel extends JPanel
{
public void paintComponent(Graphics g)
{
super.paintComponent(g);
g.drawOval(0,0,100,100);
double hourAngle=2*Math.PI*(minutes-3*60)/(12*60);
double minuteAngle=2*Math.PI*(minutes-15)/60;
g.drawLine(50,50,50+(int)(30*Math.cos(hourAngle)),
50+(int)(30*Math.sin(hourAngle)));
g.drawLine(50,50,50+(int)(30*Math.cos(minuteAngle)),
50+(int)(30*Math.sin(minuteAngle)));
}
public void setTime(int h,int m)
{
minutes=h*60+m;
repaint();
}
public void tick()
{
minutes++;
repaint();
}
private int minutes=0;
}
public class ValidationTest
{
public static void main(String[] args)
{
JFrame frame=new ValidationTestFrame();
frame.show();
}
}
class IntTextDocument extends PlainDocument
{
public void insertString(int offs,String str,AttributeSet a) throws BadLocationException
{
if (str==null) return;
String oldString=getText(0,getLength());
String newString=oldString.substring(0,offs)+
str+oldString.substring(offs);
try
{
Integer.parseInt(newString+"0");
super.insertString(offs,str,a);
}
catch(NumberFormatException e)
{
}
}
}
class IntTextField extends JTextField
{
public IntTextField(int defval,int size)
{
super(""+defval,size);
}
protected Document createDefaultModel()
{
return new IntTextDocument();
}
public boolean isValid()
{
try {
Integer.parseInt(getText());
return true;
}
catch(NumberFormatException e)
{
return false;
}
}
public int getValue()
{
try
{
return Integer.parseInt(getText());
}
catch(NumberFormatException e)
{
return 0;
}
}
}
编译错误如下：
C:docValidationTest.java:6: ValidationTestFrame 必须声明为 abstract; 它没有在 ValidationTestFrame 中定义 changedUpdate(javax.swing.event.DocumentEvent)
class ValidationTestFrame extends JFrame implements DocumentListener
^
1 个错误
Tool completed with exit code 1
请把正确的解决方法告诉我，非常感谢！！！
最好给我一个正确的程序让我比较错误之出
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
class ValidationTestFrame extends JFrame implements DocumentListener
{
public ValidationTestFrame()
{
setTitle("validationTset");
setSize(300,200);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
Container contentPane=getContentPane();
JPanel p=new JPanel();
hourField=new IntTextField(12,3);
p.add(hourField);
hourField.getDocument().addDocumentListener(this);
minuteField=new IntTextField(0,3);
p.add(minuteField);
minuteField.getDocument().addDocumentListener(this);
contentPane.add(p,"South");
clock=new ClockPanel();
contentPane.add(clock,"Center");
}
public void insertUpdate(DocumentEvent e)
{
setClock();
}
public void removeUpdate(DocumentEvent e)
{
setClock();
}
public void changeUpdate(DocumentEvent e)
{
setClock();
}
public void setClock()
{
if (hourField.isValid() && minuteField.isValid())
{
int hours=hourField.getValue();
int minutes=minuteField.getValue();
clock.setTime(hours,minutes);
}
}
private IntTextField hourField;
private IntTextField minuteField;
private ClockPanel clock;
}
class ClockPanel extends JPanel
{
public void paintComponent(Graphics g)
{
super.paintComponent(g);
g.drawOval(0,0,100,100);
double hourAngle=2*Math.PI*(minutes-3*60)/(12*60);
double minuteAngle=2*Math.PI*(minutes-15)/60;
g.drawLine(50,50,50+(int)(30*Math.cos(hourAngle)),
50+(int)(30*Math.sin(hourAngle)));
g.drawLine(50,50,50+(int)(30*Math.cos(minuteAngle)),
50+(int)(30*Math.sin(minuteAngle)));
}
public void setTime(int h,int m)
{
minutes=h*60+m;
repaint();
}
public void tick()
{
minutes++;
repaint();
}
private int minutes=0;
}
public class ValidationTest
{
public static void main(String[] args)
{
JFrame frame=new ValidationTestFrame();
frame.show();
}
}
class IntTextDocument extends PlainDocument
{
public void insertString(int offs,String str,AttributeSet a) throws BadLocationException
{
if (str==null) return;
String oldString=getText(0,getLength());
String newString=oldString.substring(0,offs)+
str+oldString.substring(offs);
try
{
Integer.parseInt(newString+"0");
super.insertString(offs,str,a);
}
catch(NumberFormatException e)
{
}
}
}
class IntTextField extends JTextField
{
public IntTextField(int defval,int size)
{
super(""+defval,size);
}
protected Document createDefaultModel()
{
return new IntTextDocument();
}
public boolean isValid()
{
try {
Integer.parseInt(getText());
return true;
}
catch(NumberFormatException e)
{
return false;
}
}
public int getValue()
{
try
{
return Integer.parseInt(getText());
}
catch(NumberFormatException e)
{
return 0;
}
}
}
编译错误如下：
C:docValidationTest.java:6: ValidationTestFrame 必须声明为 abstract; 它没有在 ValidationTestFrame 中定义 changedUpdate(javax.swing.event.DocumentEvent)
class ValidationTestFrame extends JFrame implements DocumentListener
^
1 个错误
Tool completed with exit code 1
请把正确的解决方法告诉我，非常感谢！！！
最好给我一个正确的程序让我比较错误之出
|
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
class ValidationTestFrame extends JFrame implements DocumentListener
{
public ValidationTestFrame()
{
setTitle("validationTset");
setSize(300,200);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
Container contentPane=getContentPane();
JPanel p=new JPanel();
hourField=new IntTextField(12,3);
p.add(hourField);
hourField.getDocument().addDocumentListener(this);
minuteField=new IntTextField(0,3);
p.add(minuteField);
minuteField.getDocument().addDocumentListener(this);
contentPane.add(p,"South");
clock=new ClockPanel();
contentPane.add(clock,"Center");
}
public void insertUpdate(DocumentEvent e)
{
setClock();
}
public void removeUpdate(DocumentEvent e)
{
setClock();
}
public void changedUpdate(DocumentEvent e)
{
setClock();
}
public void setClock()
{
if (hourField.isValid() && minuteField.isValid())
{
int hours=hourField.getValue();
int minutes=minuteField.getValue();
clock.setTime(hours,minutes);
}
}
private IntTextField hourField;
private IntTextField minuteField;
private ClockPanel clock;
}
class ClockPanel extends JPanel
{
public void paintComponent(Graphics g)
{
super.paintComponent(g);
g.drawOval(0,0,100,100);
double hourAngle=2*Math.PI*(minutes-3*60)/(12*60);
double minuteAngle=2*Math.PI*(minutes-15)/60;
g.drawLine(50,50,50+(int)(30*Math.cos(hourAngle)),
50+(int)(30*Math.sin(hourAngle)));
g.drawLine(50,50,50+(int)(30*Math.cos(minuteAngle)),
50+(int)(30*Math.sin(minuteAngle)));
}
public void setTime(int h,int m)
{
minutes=h*60+m;
repaint();
}
public void tick()
{
minutes++;
repaint();
}
private int minutes=0;
}
public class ValidationTest
{
public static void main(String[] args)
{
JFrame frame=new ValidationTestFrame();
frame.show();
}
}
class IntTextDocument extends PlainDocument
{
public void insertString(int offs,String str,AttributeSet a) throws BadLocationException
{
if (str==null) return;
String oldString=getText(0,getLength());
String newString=oldString.substring(0,offs)+
str+oldString.substring(offs);
try
{
Integer.parseInt(newString+"0");
super.insertString(offs,str,a);
}
catch(NumberFormatException e)
{
}
}
}
class IntTextField extends JTextField
{
public IntTextField(int defval,int size)
{
super(""+defval,size);
}
protected Document createDefaultModel()
{
return new IntTextDocument();
}
public boolean isValid()
{
try {
Integer.parseInt(getText());
return true;
}
catch(NumberFormatException e)
{
return false;
}
}
public int getValue()
{
try
{
return Integer.parseInt(getText());
}
catch(NumberFormatException e)
{
return 0;
}
}
}
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;
class ValidationTestFrame extends JFrame implements DocumentListener
{
public ValidationTestFrame()
{
setTitle("validationTset");
setSize(300,200);
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
Container contentPane=getContentPane();
JPanel p=new JPanel();
hourField=new IntTextField(12,3);
p.add(hourField);
hourField.getDocument().addDocumentListener(this);
minuteField=new IntTextField(0,3);
p.add(minuteField);
minuteField.getDocument().addDocumentListener(this);
contentPane.add(p,"South");
clock=new ClockPanel();
contentPane.add(clock,"Center");
}
public void insertUpdate(DocumentEvent e)
{
setClock();
}
public void removeUpdate(DocumentEvent e)
{
setClock();
}
public void changedUpdate(DocumentEvent e)
{
setClock();
}
public void setClock()
{
if (hourField.isValid() && minuteField.isValid())
{
int hours=hourField.getValue();
int minutes=minuteField.getValue();
clock.setTime(hours,minutes);
}
}
private IntTextField hourField;
private IntTextField minuteField;
private ClockPanel clock;
}
class ClockPanel extends JPanel
{
public void paintComponent(Graphics g)
{
super.paintComponent(g);
g.drawOval(0,0,100,100);
double hourAngle=2*Math.PI*(minutes-3*60)/(12*60);
double minuteAngle=2*Math.PI*(minutes-15)/60;
g.drawLine(50,50,50+(int)(30*Math.cos(hourAngle)),
50+(int)(30*Math.sin(hourAngle)));
g.drawLine(50,50,50+(int)(30*Math.cos(minuteAngle)),
50+(int)(30*Math.sin(minuteAngle)));
}
public void setTime(int h,int m)
{
minutes=h*60+m;
repaint();
}
public void tick()
{
minutes++;
repaint();
}
private int minutes=0;
}
public class ValidationTest
{
public static void main(String[] args)
{
JFrame frame=new ValidationTestFrame();
frame.show();
}
}
class IntTextDocument extends PlainDocument
{
public void insertString(int offs,String str,AttributeSet a) throws BadLocationException
{
if (str==null) return;
String oldString=getText(0,getLength());
String newString=oldString.substring(0,offs)+
str+oldString.substring(offs);
try
{
Integer.parseInt(newString+"0");
super.insertString(offs,str,a);
}
catch(NumberFormatException e)
{
}
}
}
class IntTextField extends JTextField
{
public IntTextField(int defval,int size)
{
super(""+defval,size);
}
protected Document createDefaultModel()
{
return new IntTextDocument();
}
public boolean isValid()
{
try {
Integer.parseInt(getText());
return true;
}
catch(NumberFormatException e)
{
return false;
}
}
public int getValue()
{
try
{
return Integer.parseInt(getText());
}
catch(NumberFormatException e)
{
return 0;
}
}
}
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本站(WWW.)站内文章除注明原创外，均为转载、整理或搜集自网络。欢迎任何形式的转载，转载请注明出处。