Cannot get QT Gui Application to display chinese

[Weichen]

Hello, I am new to the QT SDK 4.6.1 and currently learning qt through C++-GUI-Programming-with-Qt-4-1st-ed

I am trying to display some chinese words in a simple qt windows and it shows up all rubbish.

here is the code

#include <QApplication>
#include <QLabel>
 
int main( int argc, char* argv[])
{
QApplication App(argc,argv);
QLabel *label = new QLabel("XXXX"); //where XXXX is chinese character
label -> show();
return app.exec()
}

#include <QApplication>
#include <QLabel>

int main( int argc, char* argv[])
{
QApplication App(argc,argv);
QLabel *label = new QLabel("XXXX"); //where XXXX is chinese character
label -> show();
return app.exec()
}

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The code ran well and showed a little windows, the only problem is that the chinese character are messed up.

It would be nice if someone can show me how to solve these problems or I might as well just go back to MFC.

ps.
I've been search through internet for solutions; however, nothing mentionable has been found. I've read the internationlization with QT and tried

QString text = "XXXX";
QLabel *label = new QLabel(text);

QString text = "XXXX";
QLabel *label = new QLabel(text);

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and it did not work. I donno the tr() function as there is no real example that solved the multi-langue display problem