Thread: Really bad at this

No idea what is happening and why it's not working. New to the concept of polymorphism.

public class main{
	public static void main(String[] args){
 
		a cOb[] = new a[2];
		cOb[0] = new a();
		cOb[1] = new b();
		cOb[2] = new c();
 
		for(int x = 0; x < cOb.length; x++){
			cOb[x].master();
		}
	}
}
 
public class a{
 
	public void master(){
		System.out.println("I'm the master.");
	}
 
}
 
public class b extends a{
 
	public void master(){
		System.out.println("I might be the master.");
	}
 
}
 
public class c extends a{
 
	public void master(){
		System.out.println("I'm probably not the master.");
	}
 
}

Whenever I run the code it gives me the following error:
"Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2
at average.main.main(main.java:9)"

My guess was that it was something that was wrong with line 2 or 9 in the main class but I couldn't find any mistake.

Thanks in advance for any help.

With this statement:

a cOb[] = new a[2];

an array is created that can hold 2 items. And then these statements:

cOb[0] = new a();
cOb[1] = new b();
cOb[2] = new c();

try to cram 3 items in a sock that can only hold two. From that explanation, you might deduce that an array that holds two items can only have the indices 0 and 1.

I also recommend:

In Java, class names begin with capital letters.
Don't call a class Main - it's just confusing.
Give your classes and variables better, more descriptive names. Single-letter names, except for loop control variables, are not appropriate.
Comment your code to describe what it does or is supposed to do.

Thank you, I meant to make an array that can hold 5 items but I think I got confused since I only had 2 classes that I wanted it to hold. Appreciate the recommendations, will try my best to implement as much of it as possible. :-)

You're welcome.

A significant part of becoming better at programming is paying attention to the details and developing your own good practices that when not followed will alert you to small problems before they become big problems.