Questions with java.lang.Class

Question

1.What's the use of Class.getClasses() & Class.getDeclaredClasses()?
I wrote the class below:
public class ClassDemo {
   public String str = new String();
   public Integer inte = new Integer(0);
   public static void main(String[] args) throws Exception {
     ClassDemo cd = new ClassDemo();
     Class c = cd.getClass();
     Class classes[] = c.getDeclaredClasses();
     for(int i = 0; i <= classes.length; i++) {
        System.out.println(classes.getName());
But it thrown java.lang.ArrayIndexOutOfBoundsException.
I checked, just because the classes.length is zero.
Why? I declared two String class inside the ClassDemo,but why the getDeclaredClasses() return zero class?
What does the declared classes mean?
And , what 's the difference between getClasses() & getDeclaredClasses()?
Can u give me an example?
2.What's the use of Class.getComponentType()? what is the component type ?

Answer 1

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They much prefer to have you spend more time
trying to figure it out for yourself (which is good)
than you already have done. And, if you're like me,
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a blast for a number of days before you've given in
and come here to ask this wretched batch of not very
helpful individuals.You think this wonderful batch of highly helpful indivisuals get paid for answering your question. They tell you where your mouth is, where the food is, even how to grab it and eat it. If you are expecting them to grab it and put it into your mouth.....you need to checkout the best kindergarten around. Best of Luck.
Oh, once your page drops off the first page in the
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I've found answers for all my questions I've asked them so far. I find this place wonderful to hang out rather than trawling the web for interview questions. May be u should change your attitude.