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J2ME getDisplay() method

In J2ME to create the Display class object we use

private Display d;
d=Display.getDisplay(this);

What is this as parameter?

I know this refers to the current instance but when I write the following I get errors

d=Display.getDisplay(new MyClassName());

When I saw in book the method was written like below

static Display getDisplay(MIDlet midlet)

So then I tried this

MIDlet m;
d=Display.getDisplay(m);

But I am getting errors and I cannot even pass new MIDlet() as parameter since it's an abstract class.

Solution

  • As Android says, this in d=Display.getDisplay(this); refers to your MIDlet.

    But when you write the following you get errors

    d=Display.getDisplay(new MyClassName());

    It's because you try to create MIDlet by it's constructor. You would to see MIDlet doc:

    protected MIDlet() Protected constructor for subclasses. The application management software is responsible for creating MIDlets and creation of MIDlets is restricted. MIDlets should not attempt to create other MIDlets. Throws: SecurityException - unless the application management software is creating the MIDlet.