//Tue: A1 tutorial
//Thr we have a quiz in lecture! Bring you i-clicker!

//what if we want to customize JFrame
// for example double the width&height of the window
//   or make the window a perfect square

OurJFrame oj = new OurJFrame();
oj.setVisible(true); //from JFrame
oj.setSize(100,300); //from JFrame
oj.setTitle("This is a window!");  //from JFrame
oj.doubleSize();  //from OurJFrame!

//we wrote a doubleDouble() method that just called doubleSize()
// twice, but then removed it!

//let's write a costomized "constructor" that makes the window
// visible by default, and sets the size to 200x100, and sets a title.
OurJFrame oj = new OurJFrame("Hello!")
oj.doubleSize()
oj.doubleSize() //each time: doubling the window size