Construct a PictureExplorer object

Listing 7 begins by constructing a new PictureExplorer object

• that encapsulates the Picture object instantiated earlier, and
• by saving a reference to the PictureExplorer object in the instance variable named explorer.

    explorer = new PictureExplorer(pix);
    
    explorerFrame = explorer.getFrame();
    explorerFrame.setDefaultCloseOperation(
                     WindowConstants.DO_NOTHING_ON_CLOSE);