Question

java中关于打印的，有许多错误，求高手。帮忙改正

import java.awt.*;
import java.awt.event.*;
public class Example7_37
{
public static void main(String args[])
{
MyFrame f=new MyFrame();
f.setBounds(70,70,70,89);
f.setVisible(true);
f.validate();
}
}
class MyFrame implements ActionListener
{
PrintJob p=null;
Graphics g=null;
TextArea text=new TextArea(10,10);
Button 打印文本框=new Button("打印文本框"),
打印窗口=new Button("打印窗口"),
打印按钮=new Button("打印按钮");
MyFrame()
{
super("在应用程序中打印");
打印文本框.addActionListener(this);
打印窗口.addActionListener(this);
打印按钮.addActionListener(this);
add(text,"Center");
Panel panel=new Panel();
panel.add("打印文本框");
panel.add("打印窗口");
panel.add("打印按钮");
add(panel,"South");
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==打印文本框)
{
p=getToolkit().getPrintJob(this,"ok",null);
g=p.getGraphics();
g.translate(120,200);
text.printAll(g);
g.dispose();
p.end();
}
else if(e.getSource()==打印窗口)
{
p=getToolkit().getPrintJob(this,"ok",null);
g=p.getGraphics();
g.translate(120,200);
this.printAll(g);
g.dispose();
p.end();
}
else if(e.getSource()==打印按钮)
{
p=getToolkit().getPrintJob(this,"ok",null);
g=p.getGraphics();
g.translate(120,200);
打印文本框.printAll(g);
g.translate(78,0);
打印窗口.printAll(g);
g.translate(66,0);
打印按钮.printAll(g);
g.dispose();
p.end();
}
}

}

Answer 1

import java.awt.*;import java.awt.event.*;
import javax.swing.JFrame;
public class Example7_37
{
public static void main(String args[])
{
MyFrame f=new MyFrame();
f.setBounds(70,70,70,89);
f.setVisible(true);
f.validate();
}
}
class MyFrame extends JFrame implements ActionListener
{
PrintJob p=null;
Graphics g=null;
TextArea text=new TextArea(10,10);
Button 打印文本框=new Button("打印文本框"),
打印窗口=new Button("打印窗口"),
打印按钮=new Button("打印按钮");
MyFrame()
{
super("在应用程序中打印");
打印文本框.addActionListener(this);
打印窗口.addActionListener(this);
打印按钮.addActionListener(this);
add(text,"Center");
Panel panel=new Panel();
panel.add(打印文本框);
panel.add(打印窗口);
panel.add(打印按钮);
add(panel,"South");
addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==打印文本框)
{
p=getToolkit().getPrintJob(this,"ok",null);
g=p.getGraphics();
g.translate(120,200);
text.printAll(g);
g.dispose();
p.end();
}
else if(e.getSource()==打印窗口)
{
p=getToolkit().getPrintJob(this,"ok",null);
g=p.getGraphics();
g.translate(120,200);
this.printAll(g);
g.dispose();
p.end();
}
else if(e.getSource()==打印按钮)
{
p=getToolkit().getPrintJob(this,"ok",null);
g=p.getGraphics();
g.translate(120,200);
打印文本框.printAll(g);
g.translate(78,0);
打印窗口.printAll(g);
g.translate(66,0);
打印按钮.printAll(g);
g.dispose();
p.end();
}
}

}

自己去对比，另外 变量名最好用英文，不要用中文！