创建一个quit按钮

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#ifndef PUSHBUTTONTEST_H#define PUSHBUTTONTEST_H#include <QWidget>class PushButtonTest : public QWidget{    Q_OBJECTpublic:    explicit PushButtonTest(QWidget *parent = 0);    ~PushButtonTest();};#endif // PUSHBUTTONTEST_H

#include "pushbuttontest.h"#include "ui_pushbuttontest.h"#include <QPushButton>#include <QFont>PushButtonTest::PushButtonTest(QWidget *parent) :    QWidget(parent){    setMaximumSize(200, 120);    setMinimumSize(200, 120);    QPushButton *quit = new QPushButton("Quit", this);    quit->setGeometry(62, 40, 75, 30);    quit->setFont(QFont("Times", 18, QFont::Bold));    connect(quit, SIGNAL(clicked()), this, SLOT(close()));}PushButtonTest::~PushButtonTest(){}

#include "pushbuttontest.h"

#include <QApplication>

int main(int argc, char *argv[])

    QApplication a(argc, argv);

    PushButtonTest w;

   // w.setGeometry(100, 100, 200, 120);

    w.show();

    return a.exec();

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