How do I sent font of labels in an array?

[Exhonour]

So heres the array:

  JLabel [] lesson = new JLabel [6];  
  JLabel [] sublesson = new JLabel [16];

Then I got:

    for (int x=0;x>=5;x++)
    {
      lesson[x].setFont(new Font("Tw Cen MT", Font.BOLD, 30));
      lesson[x].setHorizontalAlignment(SwingConstants.CENTER);
    }
    for (int y=0;y>=15;y++)
    {
      sublesson[y].setFont(new Font("Tw Cen MT", Font.BOLD, 14));
      sublesson[y].setHorizontalAlignment(SwingConstants.CENTER);
    }

Which does nothing. Why?

[raffaele181188]

Beause every reference in your array is still null.
You should initialize each object in the array with a new statement. Google "java array initialization"

[Exhonour]

    lesson[0] = new JLabel("Introduction");
    sublesson[1] = new JLabel("At the end of this lesson you will be able to do the following:");
    sublesson[2] = new JLabel("- Predict whether an object will be attracted to a magnet.");
    sublesson[3] = new JLabel("- Locate the poles of various types of magnets. ");
    sublesson[4] = new JLabel("- Observe the attraction and repulsion of magnetic poles.");
    sublesson[5] = new JLabel("- Identify some uses of magnets.");

Like that you mean?

[Steve11235]

That will certainly help. There were no labels at all, before.

Were you getting a bunch of null pointer exceptions before? You might not have been able to see the exceptions if your code was running on the event dispatcher thread...

[Exhonour]

Actually it did nothing. No change in font or the alignment. What now?

[Fubarable]

If it were me, I'd create a small program that just tried to do one simple thing, say change the font of a JLabel and display it, and get that program to work. If it works, great, I'd move on to the next thing, say to show an array of JLabel. And if I got stuck, I'd post that small (key on small) compilable and runnable program that demonstrates the problem and hope that someone could help me.

[DarrylBurke]

for (int x=0;x>=5;x++)

How many times do you think that loop will be entered?

Hint: for how many iterations is x greater than or equal to 5?

db

[mtyoung]

0,
because x=0 and x is not >=5; the for loop ends

[Steve11235]

Just a style note: Typically, programmers use i<6 instead of i<=5

In general, run your program in debug and watch what it is doing. That's a lot faster and more effective than posting on a forum.

[Exhonour]

Thx for ur help that solved it