| 发表于：2007-01-22 14:38:29 楼主 |
有谁能告诉我最后一句w.validate（);是什么意思啊,以前没遇上过?谢谢大哥们了
import java.io.*;
import java.awt.*;
import java.awt.event.*;
class ewindow extends frame implements actionlistener
{
textarea text;
button buttonread,buttonwrite;
bufferedreader bufferin;
filereader in;
bufferedwriter bufferout;
filewriter out;
ewindow （)
{
super（ "流的读取 ");
text=new textarea（10,10);
buttonread=new button（ "读取 ");
buttonread.addactionlistener（this);
buttonwrite=new button（ "写出 ");
buttonwrite.addactionlistener（this);
setlayout（new borderlayout（));
setsize（340,340);
setvisible（true);
add（text,borderlayout.center);
panel pnorth=new panel（);
pnorth.add（buttonread);
pnorth.add（buttonwrite);
pnorth.validate（);
add（borderlayout.north,pnorth);
addwindowlistener（new windowadapter（)
{
public void windowclosing（windowevent e)
{
system.exit（0);
}
});
}
public void actionperformed（actionevent e)
{
string s;
if（e.getsource（)==buttonread)
{
try{
text.settext（null);
file f=new file（ "f:\\java ", "file.txt ");
in=new filereader（f);
bufferin=new bufferedreader（in);
while（（s=bufferin.readline（))!=null)
{
text.append（s);
}
bufferin.close（);
in.close（);
}
catch（ioexception exp)
{
system.out.println（exp);
}
}
if（e.getsource（)==buttonwrite)
{
try{
file f=new file（ "f:\\java ", "file.txt ");
out=new filewriter（f);
bufferout=new bufferedwriter（out);
bufferout.write（text.gettext（),0,（text.gettext（)).length（));
bufferout.flush（);
bufferout.close（);
out.close（);
}
catch（ioexception exp)
{
system.out.println（exp);
}
}
}
}
public class file10
{
public static void main（string args[])
{
ewindow w=new ewindow（);
w.validate（);
}
} |
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