QVBoxLayout to center

[seltra]

when i use the code below, Qt puts labels on the right side.
How can i put labels centered in the line?

myproject::myproject(QWidget *parent, Qt::WFlags flags): QMainWindow(parent, flags)
{
ui.setupUi(this);
 
QVBoxLayout *mainlayout = new QVBoxLayout;
QLabel *label1= new QLabel("aaa");
QLabel *label2= new QLabel("bbb");
QLabel *label3= new QLabel("cccc");
QLabel *label4= new QLabel("ddd");
mainlayout->addWidget(label1);
mainlayout->addWidget(label2);
mainlayout->addWidget(label3);
mainlayout->addWidget(label4);
ui.centralWidget->setLayout(mainlayout);
 
 
}

myproject::myproject(QWidget *parent, Qt::WFlags flags): QMainWindow(parent, flags)
{
ui.setupUi(this);

QVBoxLayout *mainlayout = new QVBoxLayout;
QLabel *label1= new QLabel("aaa");
QLabel *label2= new QLabel("bbb");
QLabel *label3= new QLabel("cccc");
QLabel *label4= new QLabel("ddd");
mainlayout->addWidget(label1);
mainlayout->addWidget(label2);
mainlayout->addWidget(label3);
mainlayout->addWidget(label4);
ui.centralWidget->setLayout(mainlayout);


}

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